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Java 中有用的环境设置列表

发布于 2024-12-06 17:32:20 字数 339 浏览 1 评论 0原文

我很长时间以来一直想知道是否有一个完整的（可能是静态的）方法/字段列表来存储 JVM 的运行时信息。不完整的示例列表：

  • System.out / System.in
  • System.currentTimeMillis()
  • System.getProperty()
  • System.getConsole()
  • Runtime.freeMemory()
  • 等

有人有链接吗？

编辑： 我还没有愚蠢到没有检查系统和运行时的文档：P 我只是想知道是否还有其他类存储了类似的方法来确定您正在运行的机器的状态。

原文

I've been wondering a long time if there was a comprehensive list of (probably static) methods/fields that store runtime information for the JVM. An incomplete list of examples:

  • System.out / System.in
  • System.currentTimeMillis()
  • System.getProperty()
  • System.getConsole()
  • Runtime.freeMemory()
  • Etc

Does anyone have a link or something?

EDIT:
I'm not so dumb as to have not checked the docs for System and Runtime :P
I was just wondering if there were other classes where similar methods to determine the state of the machine you're running on are stored.

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断桥再见 2024-12-13 17:32:20

常规属性

我使用此代码来处理一些我特别感兴趣的 Java 类已知的事物。

系统属性

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.util.*;

import java.security.*;

/** A small GUId app. that shows many system and environment properties.
Designed to be compatible with Java 1.4+ (hence many requirements like
no foreach, no generics, no StringBuilder..).
@author Andrew Thompson
@version 2008-06-29
 */
class SystemProperties {

    static String sentence = "The quick brown fox jumped over the lazy dog.";
    static String sep = System.getProperty("line.separator");
    static String fontText =
            sentence +
            sep +
            sentence.toUpperCase() +
            sep +
            "0123456789 !@#$%^&*()_+ []\\;',./ {}|:\"<>?";

    static String[] convertObjectToSortedStringArray(Object[] unsorted) {
        String[] sorted = new String[unsorted.length];
        for (int ii = 0; ii < sorted.length; ii++) {
            sorted[ii] = (String) unsorted[ii];
        }
        Arrays.sort(sorted);
        return sorted;
    }

    static String dataPairToTableRow(String property, Object value) {
        String val = valueToString(property, value);
        return "<tr>" +
                "<th>" +
                "<code>" +
                property +
                "</code>" +
                "</th>" +
                "<td>" +
                val +
                "</td>" +
                "</tr>";
    }

    static String valueToString(String property, Object value) {
        if (value instanceof Color) {
            Color color = (Color) value;
            String converted =
                    "<div style='width: 100%; height: 100%; " +
                    "background-color: #" +
                    Integer.toHexString(color.getRed()) +
                    Integer.toHexString(color.getGreen()) +
                    Integer.toHexString(color.getBlue()) +
                    ";'>" +
                    value.toString() +
                    "</div>";
            return converted;
        } else if (property.toLowerCase().endsWith("path") ||
                property.toLowerCase().endsWith("dirs")) {
            return delimitedToHtmlList(
                    (String) value,
                    System.getProperty("path.separator"));
        } else {
            return value.toString();
        }
    }

    static String delimitedToHtmlList(String values, String delimiter) {
        String[] parts = values.split(delimiter);
        StringBuffer sb = new StringBuffer();
        sb.append("<ol>");
        for (int ii = 0; ii < parts.length; ii++) {
            sb.append("<li>");
            sb.append(parts[ii]);
            sb.append("</li>");
        }
        return sb.toString();
    }

    static Component getExampleOfFont(String fontFamily) {
        Font font = new Font(fontFamily, Font.PLAIN, 24);
        JTextArea ta = new JTextArea();
        ta.setFont(font);
        ta.setText(fontText);
        ta.setEditable(false);
        // don't allow these to get focus, as it
        // interferes with desired scroll behavior
        ta.setFocusable(false);
        return ta;
    }

    static public JScrollPane getOutputWidgetForContent(String content) {
        JEditorPane op = new JEditorPane();
        op.setContentType("text/html");
        op.setEditable(false);

        op.setText(content);

        return new JScrollPane(op);
    }

    public static void main(String[] args) {
        JTabbedPane tabPane = new JTabbedPane();
        StringBuffer sb;
        String header = "<html><body><table border=1 width=100%>";

        sb = new StringBuffer(header);
        Properties prop = System.getProperties();
        String[] propStrings = convertObjectToSortedStringArray(
                prop.stringPropertyNames().toArray());
        for (int ii = 0; ii < propStrings.length; ii++) {
            sb.append(
                    dataPairToTableRow(
                    propStrings[ii],
                    System.getProperty(propStrings[ii])));
        }
        tabPane.addTab(
                "System",
                getOutputWidgetForContent(sb.toString()));

        sb = new StringBuffer(header);
        Map environment = System.getenv();
        String[] envStrings = convertObjectToSortedStringArray(
                environment.keySet().toArray());
        for (int ii = 0; ii < envStrings.length; ii++) {
            sb.append(
                    dataPairToTableRow(
                    envStrings[ii],
                    environment.get(envStrings[ii])));
        }
        tabPane.addTab(
                "Environment",
                getOutputWidgetForContent(sb.toString()));

        sb = new StringBuffer(header);
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice[] gs = ge.getScreenDevices();
        for (int j = 0; j < gs.length; j++) {
            GraphicsDevice gd = gs[j];
            sb.append(
                    dataPairToTableRow(
                    "Device " + j,
                    gd.toString() +
                    "  " +
                    gd.getIDstring()));
            GraphicsConfiguration[] gc =
                    gd.getConfigurations();
            for (int i = 0; i < gc.length; i++) {
                sb.append(
                        dataPairToTableRow(
                        "Config " +
                        i,
                        (int) gc[i].getBounds().getWidth() +
                        "x" +
                        (int) gc[i].getBounds().getHeight() +
                        " " +
                        gc[i].getColorModel() +
                        ", " +
                        "  Accelerated: " +
                        gc[i].getImageCapabilities().isAccelerated() +
                        "  True Volatile: " +
                        gc[i].getImageCapabilities().isTrueVolatile()));
            }
        }
        tabPane.addTab(
                "Graphics Environment",
                getOutputWidgetForContent(sb.toString()));

        String[] fonts = ge.getAvailableFontFamilyNames();
        JPanel fontTable = new JPanel(new BorderLayout(3, 1));
        // to enable key based scrolling in the font panel
        fontTable.setFocusable(true);
        JPanel fontNameCol = new JPanel(new GridLayout(0, 1, 2, 2));
        JPanel fontExampleCol = new JPanel(new GridLayout(0, 1, 2, 2));
        fontTable.add(fontNameCol, BorderLayout.WEST);
        fontTable.add(fontExampleCol, BorderLayout.CENTER);
        for (int ii = 0; ii < fonts.length; ii++) {
            fontNameCol.add(new JLabel(fonts[ii]));
            fontExampleCol.add(getExampleOfFont(fonts[ii]));
        }
        tabPane.add("Fonts", new JScrollPane(fontTable));

        sb = new StringBuffer(header);

        sb.append("<thead>");
        sb.append("<tr>");
        sb.append("<th>");
        sb.append("Code");
        sb.append("</th>");
        sb.append("<th>");
        sb.append("Language");
        sb.append("</th>");
        sb.append("<th>");
        sb.append("Country");
        sb.append("</th>");
        sb.append("<th>");
        sb.append("Variant");
        sb.append("</th>");
        sb.append("</tr>");
        sb.append("</thead>");

        Locale[] locales = Locale.getAvailableLocales();
        SortableLocale[] sortableLocale = new SortableLocale[locales.length];
        for (int ii = 0; ii < locales.length; ii++) {
            sortableLocale[ii] = new SortableLocale(locales[ii]);
        }
        Arrays.sort(sortableLocale);
        for (int ii = 0; ii < locales.length; ii++) {
            String prefix = "";
            String suffix = "";
            Locale locale = sortableLocale[ii].getLocale();
            if (locale.equals(Locale.getDefault())) {
                prefix = "<b>";
                suffix = "</b>";
            }
            sb.append(dataPairToTableRow(
                    prefix +
                    locale.toString() +
                    suffix,
                    prefix +
                    locale.getDisplayLanguage() +
                    suffix +
                    "</td><td>" +
                    prefix +
                    locale.getDisplayCountry() +
                    suffix +
                    "</td><td>" +
                    prefix +
                    locale.getDisplayVariant() +
                    suffix));
        }
        tabPane.add("Locales",
                getOutputWidgetForContent(sb.toString()));

        Locale.getDefault();
        int border = 5;
        JPanel p = new JPanel(new BorderLayout());
        p.setBorder(new EmptyBorder(border, border, border, border));
        p.add(tabPane, BorderLayout.CENTER);
        p.setPreferredSize(new Dimension(400, 400));
        JFrame f = new JFrame("Properties");
        f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        f.getContentPane().add(p, BorderLayout.CENTER);
        f.pack();
        f.setMinimumSize(f.getPreferredSize());
        f.setSize(600, 500);
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}

class SortableLocale implements Comparable {

    Locale locale;

    SortableLocale(Locale locale) {
        this.locale = locale;
    }

    public String toString() {
        return locale.toString();
    }

    public Locale getLocale() {
        return locale;
    }

    public int compareTo(Object object2) {
        SortableLocale locale2 = (SortableLocale) object2;
        //Locale locale2 = (Locale)object2;
        return locale.toString().compareTo(
                locale2.toString());
    }
}

媒体

与合成和采样的声音以及图像相关的

属性。 Media Types

/*
<applet
    code='MediaTypes'
    width='900'
    height='600'>
<param name='show' value='Sound|Sampled|Mixers|Primary Sound Capture Driver'>
</applet>
*/
import javax.imageio.ImageIO;
import javax.sound.sampled.*;
import javax.sound.midi.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.tree.*;
import javax.swing.event.*;
import javax.swing.text.Position;

public class MediaTypes extends JApplet {

    JTable table;
    boolean sortable = false;
    JTree tree;

    @Override
    public void init() {
        Runnable r = () -> {
            MediaTypes mediaTypes = new MediaTypes();

            String show = "";
            if (getParameter("show")!=null) {
                show = getParameter("show");
            }

            JPanel p = new JPanel();
            mediaTypes.createGui(p, show);
            add(p);
            validate();
        };
        SwingUtilities.invokeLater(r);
    }

    public static void main(String[] args) {
        Runnable r = () -> {
            MediaTypes mediaTypes = new MediaTypes();

            JPanel p = new JPanel();
            mediaTypes.createGui(p);
            JOptionPane.showMessageDialog(null,p);
        };
        SwingUtilities.invokeLater(r);
    }

    public Object[][] mergeArrays(String name1, Object[] data1, String name2, Object[] data2) {
        Object[][] data = new Object[data1.length+data2.length][2];
        for (int ii=0; ii<data1.length; ii++) {
            data[ii][0] = name1;
            data[ii][1] = data1[ii];
        }
        int offset = data1.length;
        for (int ii=offset; ii<data.length; ii++) {
            data[ii][0] = name2;
            data[ii][1] = data2[ii-offset];
        }
        return data;
    }

    public void createGui(JPanel panel) {
        createGui(panel, "");
    }

    public String getShortLineName(String name) {
        String[] lineTypes = {
            "Clip",
            "SourceDataLine",
            "TargetDataLine",
            "Speaker",
            "Microphone",
            "Master Volume",
            "Line In"
        };
        for (String shortName : lineTypes) {
            if ( name.toLowerCase().replaceAll("_", " ").contains(shortName.toLowerCase() )) {
                return shortName;
            }
        }
        return name;
    }

    public void createGui(JPanel panel, String path) {

        //DefaultMutableTreeNode selected = null;

        panel.setLayout( new BorderLayout(5,5) );
        final JLabel output = new JLabel("Select a tree leaf to see the details.");
        panel.add(output, BorderLayout.SOUTH);

        table = new JTable();
        try {
            table.setAutoCreateRowSorter(true);
            sortable = true;
        } catch (Throwable ignore) {
            // 1.6+ functionality - not vital
        }
        JScrollPane tableScroll = new JScrollPane(table);
        Dimension d = tableScroll.getPreferredSize();
        d = new Dimension(450,d.height);
        tableScroll.setPreferredSize(d);
        panel.add( tableScroll, BorderLayout.CENTER );

        DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Media");
        DefaultTreeModel treeModel = new DefaultTreeModel(rootNode);

        DefaultMutableTreeNode imageNode = new DefaultMutableTreeNode("Image");
        rootNode.add(imageNode);

        Object[][] data;
        int offset;
        String[] columnNames;

        data = mergeArrays(
            "Reader",
            ImageIO.getReaderFileSuffixes(),
            "Writer",
            ImageIO.getWriterFileSuffixes() );
        columnNames = new String[]{"Input/Output", "Image File Suffixes"};
        MediaData md = new MediaData( "Suffixes", columnNames, data);
        imageNode.add(new DefaultMutableTreeNode(md));

        data = mergeArrays(
            "Reader",
            ImageIO.getReaderMIMETypes(),
            "Writer",
            ImageIO.getWriterMIMETypes() );
        columnNames = new String[]{"Input/Output", "Image MIME Types"};
        md = new MediaData( "MIME", columnNames, data);
        imageNode.add(new DefaultMutableTreeNode(md));

        DefaultMutableTreeNode soundNode = new DefaultMutableTreeNode("Sound");
        rootNode.add(soundNode);

        DefaultMutableTreeNode soundSampledNode = new DefaultMutableTreeNode("Sampled");
        soundNode.add(soundSampledNode);

        md = new MediaData("Suffixes", "Sound File Suffixes", AudioSystem.getAudioFileTypes());
        soundSampledNode.add(new DefaultMutableTreeNode(md));

        Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();
        String[][] mixerData = new String[mixerInfo.length][4];
        for (int ii=0; ii<mixerData.length; ii++) {
            mixerData[ii][0] = mixerInfo[ii].getName();
            mixerData[ii][1] = mixerInfo[ii].getVendor();
            mixerData[ii][2] = mixerInfo[ii].getVersion();
            mixerData[ii][3] = mixerInfo[ii].getDescription();
        }
        columnNames = new String[]{"Name", "Vendor", "Version", "Description"};
        md = new MediaData("Mixers", columnNames, mixerData);
        DefaultMutableTreeNode soundSampledMixersNode = new DefaultMutableTreeNode(md);
        soundSampledNode.add(soundSampledMixersNode);

        for (Mixer.Info mixerInfo1 : mixerInfo) {
            Mixer mixer = AudioSystem.getMixer(mixerInfo1);
            data = mergeArrays(
                    "Source",
                    mixer.getSourceLineInfo(),
                    "Target",
                    mixer.getTargetLineInfo() );
            columnNames = new String[]{ "Input/Output", "Line Info" };
            md = new MediaData(mixerInfo1.getName(), columnNames, data);
            DefaultMutableTreeNode soundSampledMixerNode = new DefaultMutableTreeNode(md);
            soundSampledMixersNode.add( soundSampledMixerNode );
            Line.Info[] source = mixer.getSourceLineInfo();
            Line.Info[] target = mixer.getTargetLineInfo();
            Line[] all = new Line[source.length + target.length];
            try {
                for (int jj=0; jj<source.length; jj++) {
                    all[jj] = AudioSystem.getLine(source[jj]);
                }
                for (int jj=source.length; jj<all.length; jj++) {
                    all[jj] = AudioSystem.getLine(target[jj-source.length]);
                }
                columnNames = new String[]{"Attribute", "Value"};
                for (Line line : all) {
                    Control[] controls = line.getControls();
                    if (line instanceof DataLine) {
                        DataLine dataLine = (DataLine)line;
                        AudioFormat audioFormat = dataLine.getFormat();
                        data = new Object[7+controls.length][2];

                        data[0][0] = "Channels";
                        data[0][1] = audioFormat.getChannels();

                        data[1][0] = "Encoding";
                        data[1][1] = audioFormat.getEncoding();

                        data[2][0] = "Frame Rate";
                        data[2][1] = audioFormat.getFrameRate();

                        data[3][0] = "Sample Rate";
                        data[3][1] = audioFormat.getSampleRate();

                        data[4][0] = "Sample Size (bits)";
                        data[4][1] = audioFormat.getSampleSizeInBits();

                        data[5][0] = "Big Endian";
                        data[5][1] = audioFormat.isBigEndian();

                        data[6][0] = "Level";
                        data[6][1] = dataLine.getLevel();

                    } else if (line instanceof Port) {
                        Port port = (Port)line;
                        Port.Info portInfo = (Port.Info)port.getLineInfo();
                        data = new Object[2+controls.length][2];

                        data[0][0] = "Name";
                        data[0][1] = portInfo.getName();

                        data[1][0] = "Source";
                        data[1][1] = portInfo.isSource();
                    } else {
                        System.out.println( "?? " + line );
                    }
                    int start = data.length-controls.length;
                    for (int kk=start; kk<data.length; kk++) {
                        data[kk][0] = "Control";
                        int index = kk-start;
                        data[kk][1] = controls[index];
                    }
                    md = new MediaData(getShortLineName(line.getLineInfo().toString()), columnNames, data);
                    soundSampledMixerNode.add(new DefaultMutableTreeNode(md));
                }
            } catch(Exception e) {
                e.printStackTrace();
            }
        }

        int[] midiTypes = MidiSystem.getMidiFileTypes();
        data = new Object[midiTypes.length][2];
        for (int ii=0; ii<midiTypes.length; ii++) {
            data[ii][0] = midiTypes[ii];
            String description = "Unknown";
            switch (midiTypes[ii]) {
                case 0:
                    description = "Single Track";
                    break;
                case 1:
                    description = "Multi Track";
                    break;
                case 2:
                    description = "Multi Song";
            }
            data[ii][1] = description;
        }
        columnNames = new String[]{"Type", "Description"};
        md = new MediaData("MIDI", columnNames, data);
        DefaultMutableTreeNode soundMIDINode = new DefaultMutableTreeNode(md);
        soundNode.add(soundMIDINode);

        columnNames = new String[]{
            "Attribute",
            "Value"};
        MidiDevice.Info[] midiDeviceInfo = MidiSystem.getMidiDeviceInfo() ;
        for (MidiDevice.Info midiDeviceInfo1 : midiDeviceInfo) {
            data = new Object[6][2];
            data[0][0] = "Name";
            data[0][1] = midiDeviceInfo1.getName();
            data[1][0] = "Vendor";
            data[1][1] = midiDeviceInfo1.getVendor();
            data[2][0] = "Version";
            String version = midiDeviceInfo1.getVersion();
            data[2][1] = version.replaceAll("Version ", "");
            data[3][0] = "Description";
            data[3][1] = midiDeviceInfo1.getDescription();
            data[4][0] = "Maximum Transmitters";
            data[5][0] = "Maximum Receivers";
            try {
                MidiDevice midiDevice = MidiSystem.getMidiDevice(midiDeviceInfo1);
                Object valueTransmitter;
                if (midiDevice.getMaxTransmitters()==AudioSystem.NOT_SPECIFIED) {
                    valueTransmitter = "Not specified";
                } else {
                    valueTransmitter = midiDevice.getMaxTransmitters();
                }
                Object valueReceiver;
                if (midiDevice.getMaxReceivers()==AudioSystem.NOT_SPECIFIED) {
                    valueReceiver = "Not specified";
                } else {
                    valueReceiver = midiDevice.getMaxReceivers();
                }
                data[4][1] = valueTransmitter;
                data[5][1] = valueReceiver;
            }catch(MidiUnavailableException mue) {
                data[4][1] = "Unknown";
                data[5][1] = "Unknown";
            }
            md = new MediaData(midiDeviceInfo1.getName(), columnNames, data);
            soundMIDINode.add( new DefaultMutableTreeNode(md) );
        }

        tree = new JTree(treeModel);
        tree.setRootVisible(false);
        tree.getSelectionModel().setSelectionMode
            (TreeSelectionModel.SINGLE_TREE_SELECTION);
        tree.addTreeSelectionListener((TreeSelectionEvent tse) -> {
            if (sortable) {
                output.setText("Click table column headers to sort.");
            }

            DefaultMutableTreeNode node = (DefaultMutableTreeNode)
                    tree.getLastSelectedPathComponent();

            if (node == null) return;

            Object nodeInfo = node.getUserObject();
            if (nodeInfo instanceof MediaData) {
                MediaData mediaData = (MediaData)nodeInfo;
                table.setModel( new DefaultTableModel(
                        mediaData.getData(),
                        mediaData.getColumnNames()) );
            }
        });

        for (int ii=0; ii<tree.getRowCount(); ii++) {
            tree.expandRow(ii);
        }

        String[] paths = path.split("\\|");
        int row = 0;
        TreePath treePath = null;
        for (String prefix : paths) {
            treePath = tree.getNextMatch( prefix, row, Position.Bias.Forward );
            row = tree.getRowForPath(treePath);
        }

        panel.add(new JScrollPane(tree),BorderLayout.WEST);

        tree.setSelectionPath(treePath);
        tree.scrollRowToVisible(row);
    }
}

class MediaData {

    String name;
    String[] columnNames;
    Object[][] data;

    MediaData(String name, String columnName, Object[] data) {
        this.name = name;

        columnNames = new String[1];
        columnNames[0] = columnName;

        this.data = new Object[data.length][1];
        for (int ii=0; ii<data.length; ii++) {
            this.data[ii][0] = data[ii];
        }
    }

    MediaData(String name, String[] columnNames, Object[][] data) {
        this.name = name;
        this.columnNames = columnNames;
        this.data = data;
    }

    @Override
    public String toString() {
        return name;
    }

    public String[] getColumnNames() {
        return columnNames;
    }

    public Object[][] getData() {
        return data;
    }
}

其他

您可能还会研究：

  • InetAddress
  • KeyStore
  • 管理器
    • CookieManager
    • KeyManagerFactory
    • 日志管理器

General Properties

I use this code to get a handle on some of the things known to Java classes that are of particular interest to me.

System Properties

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.util.*;

import java.security.*;

/** A small GUId app. that shows many system and environment properties.
Designed to be compatible with Java 1.4+ (hence many requirements like
no foreach, no generics, no StringBuilder..).
@author Andrew Thompson
@version 2008-06-29
 */
class SystemProperties {

    static String sentence = "The quick brown fox jumped over the lazy dog.";
    static String sep = System.getProperty("line.separator");
    static String fontText =
            sentence +
            sep +
            sentence.toUpperCase() +
            sep +
            "0123456789 !@#$%^&*()_+ []\\;',./ {}|:\"<>?";

    static String[] convertObjectToSortedStringArray(Object[] unsorted) {
        String[] sorted = new String[unsorted.length];
        for (int ii = 0; ii < sorted.length; ii++) {
            sorted[ii] = (String) unsorted[ii];
        }
        Arrays.sort(sorted);
        return sorted;
    }

    static String dataPairToTableRow(String property, Object value) {
        String val = valueToString(property, value);
        return "<tr>" +
                "<th>" +
                "<code>" +
                property +
                "</code>" +
                "</th>" +
                "<td>" +
                val +
                "</td>" +
                "</tr>";
    }

    static String valueToString(String property, Object value) {
        if (value instanceof Color) {
            Color color = (Color) value;
            String converted =
                    "<div style='width: 100%; height: 100%; " +
                    "background-color: #" +
                    Integer.toHexString(color.getRed()) +
                    Integer.toHexString(color.getGreen()) +
                    Integer.toHexString(color.getBlue()) +
                    ";'>" +
                    value.toString() +
                    "</div>";
            return converted;
        } else if (property.toLowerCase().endsWith("path") ||
                property.toLowerCase().endsWith("dirs")) {
            return delimitedToHtmlList(
                    (String) value,
                    System.getProperty("path.separator"));
        } else {
            return value.toString();
        }
    }

    static String delimitedToHtmlList(String values, String delimiter) {
        String[] parts = values.split(delimiter);
        StringBuffer sb = new StringBuffer();
        sb.append("<ol>");
        for (int ii = 0; ii < parts.length; ii++) {
            sb.append("<li>");
            sb.append(parts[ii]);
            sb.append("</li>");
        }
        return sb.toString();
    }

    static Component getExampleOfFont(String fontFamily) {
        Font font = new Font(fontFamily, Font.PLAIN, 24);
        JTextArea ta = new JTextArea();
        ta.setFont(font);
        ta.setText(fontText);
        ta.setEditable(false);
        // don't allow these to get focus, as it
        // interferes with desired scroll behavior
        ta.setFocusable(false);
        return ta;
    }

    static public JScrollPane getOutputWidgetForContent(String content) {
        JEditorPane op = new JEditorPane();
        op.setContentType("text/html");
        op.setEditable(false);

        op.setText(content);

        return new JScrollPane(op);
    }

    public static void main(String[] args) {
        JTabbedPane tabPane = new JTabbedPane();
        StringBuffer sb;
        String header = "<html><body><table border=1 width=100%>";

        sb = new StringBuffer(header);
        Properties prop = System.getProperties();
        String[] propStrings = convertObjectToSortedStringArray(
                prop.stringPropertyNames().toArray());
        for (int ii = 0; ii < propStrings.length; ii++) {
            sb.append(
                    dataPairToTableRow(
                    propStrings[ii],
                    System.getProperty(propStrings[ii])));
        }
        tabPane.addTab(
                "System",
                getOutputWidgetForContent(sb.toString()));

        sb = new StringBuffer(header);
        Map environment = System.getenv();
        String[] envStrings = convertObjectToSortedStringArray(
                environment.keySet().toArray());
        for (int ii = 0; ii < envStrings.length; ii++) {
            sb.append(
                    dataPairToTableRow(
                    envStrings[ii],
                    environment.get(envStrings[ii])));
        }
        tabPane.addTab(
                "Environment",
                getOutputWidgetForContent(sb.toString()));

        sb = new StringBuffer(header);
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice[] gs = ge.getScreenDevices();
        for (int j = 0; j < gs.length; j++) {
            GraphicsDevice gd = gs[j];
            sb.append(
                    dataPairToTableRow(
                    "Device " + j,
                    gd.toString() +
                    "  " +
                    gd.getIDstring()));
            GraphicsConfiguration[] gc =
                    gd.getConfigurations();
            for (int i = 0; i < gc.length; i++) {
                sb.append(
                        dataPairToTableRow(
                        "Config " +
                        i,
                        (int) gc[i].getBounds().getWidth() +
                        "x" +
                        (int) gc[i].getBounds().getHeight() +
                        " " +
                        gc[i].getColorModel() +
                        ", " +
                        "  Accelerated: " +
                        gc[i].getImageCapabilities().isAccelerated() +
                        "  True Volatile: " +
                        gc[i].getImageCapabilities().isTrueVolatile()));
            }
        }
        tabPane.addTab(
                "Graphics Environment",
                getOutputWidgetForContent(sb.toString()));

        String[] fonts = ge.getAvailableFontFamilyNames();
        JPanel fontTable = new JPanel(new BorderLayout(3, 1));
        // to enable key based scrolling in the font panel
        fontTable.setFocusable(true);
        JPanel fontNameCol = new JPanel(new GridLayout(0, 1, 2, 2));
        JPanel fontExampleCol = new JPanel(new GridLayout(0, 1, 2, 2));
        fontTable.add(fontNameCol, BorderLayout.WEST);
        fontTable.add(fontExampleCol, BorderLayout.CENTER);
        for (int ii = 0; ii < fonts.length; ii++) {
            fontNameCol.add(new JLabel(fonts[ii]));
            fontExampleCol.add(getExampleOfFont(fonts[ii]));
        }
        tabPane.add("Fonts", new JScrollPane(fontTable));

        sb = new StringBuffer(header);

        sb.append("<thead>");
        sb.append("<tr>");
        sb.append("<th>");
        sb.append("Code");
        sb.append("</th>");
        sb.append("<th>");
        sb.append("Language");
        sb.append("</th>");
        sb.append("<th>");
        sb.append("Country");
        sb.append("</th>");
        sb.append("<th>");
        sb.append("Variant");
        sb.append("</th>");
        sb.append("</tr>");
        sb.append("</thead>");

        Locale[] locales = Locale.getAvailableLocales();
        SortableLocale[] sortableLocale = new SortableLocale[locales.length];
        for (int ii = 0; ii < locales.length; ii++) {
            sortableLocale[ii] = new SortableLocale(locales[ii]);
        }
        Arrays.sort(sortableLocale);
        for (int ii = 0; ii < locales.length; ii++) {
            String prefix = "";
            String suffix = "";
            Locale locale = sortableLocale[ii].getLocale();
            if (locale.equals(Locale.getDefault())) {
                prefix = "<b>";
                suffix = "</b>";
            }
            sb.append(dataPairToTableRow(
                    prefix +
                    locale.toString() +
                    suffix,
                    prefix +
                    locale.getDisplayLanguage() +
                    suffix +
                    "</td><td>" +
                    prefix +
                    locale.getDisplayCountry() +
                    suffix +
                    "</td><td>" +
                    prefix +
                    locale.getDisplayVariant() +
                    suffix));
        }
        tabPane.add("Locales",
                getOutputWidgetForContent(sb.toString()));

        Locale.getDefault();
        int border = 5;
        JPanel p = new JPanel(new BorderLayout());
        p.setBorder(new EmptyBorder(border, border, border, border));
        p.add(tabPane, BorderLayout.CENTER);
        p.setPreferredSize(new Dimension(400, 400));
        JFrame f = new JFrame("Properties");
        f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        f.getContentPane().add(p, BorderLayout.CENTER);
        f.pack();
        f.setMinimumSize(f.getPreferredSize());
        f.setSize(600, 500);
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}

class SortableLocale implements Comparable {

    Locale locale;

    SortableLocale(Locale locale) {
        this.locale = locale;
    }

    public String toString() {
        return locale.toString();
    }

    public Locale getLocale() {
        return locale;
    }

    public int compareTo(Object object2) {
        SortableLocale locale2 = (SortableLocale) object2;
        //Locale locale2 = (Locale)object2;
        return locale.toString().compareTo(
                locale2.toString());
    }
}

Media

Properties related to synthesized and sampled sound, and images.

Media Types

/*
<applet
    code='MediaTypes'
    width='900'
    height='600'>
<param name='show' value='Sound|Sampled|Mixers|Primary Sound Capture Driver'>
</applet>
*/
import javax.imageio.ImageIO;
import javax.sound.sampled.*;
import javax.sound.midi.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.tree.*;
import javax.swing.event.*;
import javax.swing.text.Position;

public class MediaTypes extends JApplet {

    JTable table;
    boolean sortable = false;
    JTree tree;

    @Override
    public void init() {
        Runnable r = () -> {
            MediaTypes mediaTypes = new MediaTypes();

            String show = "";
            if (getParameter("show")!=null) {
                show = getParameter("show");
            }

            JPanel p = new JPanel();
            mediaTypes.createGui(p, show);
            add(p);
            validate();
        };
        SwingUtilities.invokeLater(r);
    }

    public static void main(String[] args) {
        Runnable r = () -> {
            MediaTypes mediaTypes = new MediaTypes();

            JPanel p = new JPanel();
            mediaTypes.createGui(p);
            JOptionPane.showMessageDialog(null,p);
        };
        SwingUtilities.invokeLater(r);
    }

    public Object[][] mergeArrays(String name1, Object[] data1, String name2, Object[] data2) {
        Object[][] data = new Object[data1.length+data2.length][2];
        for (int ii=0; ii<data1.length; ii++) {
            data[ii][0] = name1;
            data[ii][1] = data1[ii];
        }
        int offset = data1.length;
        for (int ii=offset; ii<data.length; ii++) {
            data[ii][0] = name2;
            data[ii][1] = data2[ii-offset];
        }
        return data;
    }

    public void createGui(JPanel panel) {
        createGui(panel, "");
    }

    public String getShortLineName(String name) {
        String[] lineTypes = {
            "Clip",
            "SourceDataLine",
            "TargetDataLine",
            "Speaker",
            "Microphone",
            "Master Volume",
            "Line In"
        };
        for (String shortName : lineTypes) {
            if ( name.toLowerCase().replaceAll("_", " ").contains(shortName.toLowerCase() )) {
                return shortName;
            }
        }
        return name;
    }

    public void createGui(JPanel panel, String path) {

        //DefaultMutableTreeNode selected = null;

        panel.setLayout( new BorderLayout(5,5) );
        final JLabel output = new JLabel("Select a tree leaf to see the details.");
        panel.add(output, BorderLayout.SOUTH);

        table = new JTable();
        try {
            table.setAutoCreateRowSorter(true);
            sortable = true;
        } catch (Throwable ignore) {
            // 1.6+ functionality - not vital
        }
        JScrollPane tableScroll = new JScrollPane(table);
        Dimension d = tableScroll.getPreferredSize();
        d = new Dimension(450,d.height);
        tableScroll.setPreferredSize(d);
        panel.add( tableScroll, BorderLayout.CENTER );

        DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Media");
        DefaultTreeModel treeModel = new DefaultTreeModel(rootNode);

        DefaultMutableTreeNode imageNode = new DefaultMutableTreeNode("Image");
        rootNode.add(imageNode);

        Object[][] data;
        int offset;
        String[] columnNames;

        data = mergeArrays(
            "Reader",
            ImageIO.getReaderFileSuffixes(),
            "Writer",
            ImageIO.getWriterFileSuffixes() );
        columnNames = new String[]{"Input/Output", "Image File Suffixes"};
        MediaData md = new MediaData( "Suffixes", columnNames, data);
        imageNode.add(new DefaultMutableTreeNode(md));

        data = mergeArrays(
            "Reader",
            ImageIO.getReaderMIMETypes(),
            "Writer",
            ImageIO.getWriterMIMETypes() );
        columnNames = new String[]{"Input/Output", "Image MIME Types"};
        md = new MediaData( "MIME", columnNames, data);
        imageNode.add(new DefaultMutableTreeNode(md));

        DefaultMutableTreeNode soundNode = new DefaultMutableTreeNode("Sound");
        rootNode.add(soundNode);

        DefaultMutableTreeNode soundSampledNode = new DefaultMutableTreeNode("Sampled");
        soundNode.add(soundSampledNode);

        md = new MediaData("Suffixes", "Sound File Suffixes", AudioSystem.getAudioFileTypes());
        soundSampledNode.add(new DefaultMutableTreeNode(md));

        Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();
        String[][] mixerData = new String[mixerInfo.length][4];
        for (int ii=0; ii<mixerData.length; ii++) {
            mixerData[ii][0] = mixerInfo[ii].getName();
            mixerData[ii][1] = mixerInfo[ii].getVendor();
            mixerData[ii][2] = mixerInfo[ii].getVersion();
            mixerData[ii][3] = mixerInfo[ii].getDescription();
        }
        columnNames = new String[]{"Name", "Vendor", "Version", "Description"};
        md = new MediaData("Mixers", columnNames, mixerData);
        DefaultMutableTreeNode soundSampledMixersNode = new DefaultMutableTreeNode(md);
        soundSampledNode.add(soundSampledMixersNode);

        for (Mixer.Info mixerInfo1 : mixerInfo) {
            Mixer mixer = AudioSystem.getMixer(mixerInfo1);
            data = mergeArrays(
                    "Source",
                    mixer.getSourceLineInfo(),
                    "Target",
                    mixer.getTargetLineInfo() );
            columnNames = new String[]{ "Input/Output", "Line Info" };
            md = new MediaData(mixerInfo1.getName(), columnNames, data);
            DefaultMutableTreeNode soundSampledMixerNode = new DefaultMutableTreeNode(md);
            soundSampledMixersNode.add( soundSampledMixerNode );
            Line.Info[] source = mixer.getSourceLineInfo();
            Line.Info[] target = mixer.getTargetLineInfo();
            Line[] all = new Line[source.length + target.length];
            try {
                for (int jj=0; jj<source.length; jj++) {
                    all[jj] = AudioSystem.getLine(source[jj]);
                }
                for (int jj=source.length; jj<all.length; jj++) {
                    all[jj] = AudioSystem.getLine(target[jj-source.length]);
                }
                columnNames = new String[]{"Attribute", "Value"};
                for (Line line : all) {
                    Control[] controls = line.getControls();
                    if (line instanceof DataLine) {
                        DataLine dataLine = (DataLine)line;
                        AudioFormat audioFormat = dataLine.getFormat();
                        data = new Object[7+controls.length][2];

                        data[0][0] = "Channels";
                        data[0][1] = audioFormat.getChannels();

                        data[1][0] = "Encoding";
                        data[1][1] = audioFormat.getEncoding();

                        data[2][0] = "Frame Rate";
                        data[2][1] = audioFormat.getFrameRate();

                        data[3][0] = "Sample Rate";
                        data[3][1] = audioFormat.getSampleRate();

                        data[4][0] = "Sample Size (bits)";
                        data[4][1] = audioFormat.getSampleSizeInBits();

                        data[5][0] = "Big Endian";
                        data[5][1] = audioFormat.isBigEndian();

                        data[6][0] = "Level";
                        data[6][1] = dataLine.getLevel();

                    } else if (line instanceof Port) {
                        Port port = (Port)line;
                        Port.Info portInfo = (Port.Info)port.getLineInfo();
                        data = new Object[2+controls.length][2];

                        data[0][0] = "Name";
                        data[0][1] = portInfo.getName();

                        data[1][0] = "Source";
                        data[1][1] = portInfo.isSource();
                    } else {
                        System.out.println( "?? " + line );
                    }
                    int start = data.length-controls.length;
                    for (int kk=start; kk<data.length; kk++) {
                        data[kk][0] = "Control";
                        int index = kk-start;
                        data[kk][1] = controls[index];
                    }
                    md = new MediaData(getShortLineName(line.getLineInfo().toString()), columnNames, data);
                    soundSampledMixerNode.add(new DefaultMutableTreeNode(md));
                }
            } catch(Exception e) {
                e.printStackTrace();
            }
        }

        int[] midiTypes = MidiSystem.getMidiFileTypes();
        data = new Object[midiTypes.length][2];
        for (int ii=0; ii<midiTypes.length; ii++) {
            data[ii][0] = midiTypes[ii];
            String description = "Unknown";
            switch (midiTypes[ii]) {
                case 0:
                    description = "Single Track";
                    break;
                case 1:
                    description = "Multi Track";
                    break;
                case 2:
                    description = "Multi Song";
            }
            data[ii][1] = description;
        }
        columnNames = new String[]{"Type", "Description"};
        md = new MediaData("MIDI", columnNames, data);
        DefaultMutableTreeNode soundMIDINode = new DefaultMutableTreeNode(md);
        soundNode.add(soundMIDINode);

        columnNames = new String[]{
            "Attribute",
            "Value"};
        MidiDevice.Info[] midiDeviceInfo = MidiSystem.getMidiDeviceInfo() ;
        for (MidiDevice.Info midiDeviceInfo1 : midiDeviceInfo) {
            data = new Object[6][2];
            data[0][0] = "Name";
            data[0][1] = midiDeviceInfo1.getName();
            data[1][0] = "Vendor";
            data[1][1] = midiDeviceInfo1.getVendor();
            data[2][0] = "Version";
            String version = midiDeviceInfo1.getVersion();
            data[2][1] = version.replaceAll("Version ", "");
            data[3][0] = "Description";
            data[3][1] = midiDeviceInfo1.getDescription();
            data[4][0] = "Maximum Transmitters";
            data[5][0] = "Maximum Receivers";
            try {
                MidiDevice midiDevice = MidiSystem.getMidiDevice(midiDeviceInfo1);
                Object valueTransmitter;
                if (midiDevice.getMaxTransmitters()==AudioSystem.NOT_SPECIFIED) {
                    valueTransmitter = "Not specified";
                } else {
                    valueTransmitter = midiDevice.getMaxTransmitters();
                }
                Object valueReceiver;
                if (midiDevice.getMaxReceivers()==AudioSystem.NOT_SPECIFIED) {
                    valueReceiver = "Not specified";
                } else {
                    valueReceiver = midiDevice.getMaxReceivers();
                }
                data[4][1] = valueTransmitter;
                data[5][1] = valueReceiver;
            }catch(MidiUnavailableException mue) {
                data[4][1] = "Unknown";
                data[5][1] = "Unknown";
            }
            md = new MediaData(midiDeviceInfo1.getName(), columnNames, data);
            soundMIDINode.add( new DefaultMutableTreeNode(md) );
        }

        tree = new JTree(treeModel);
        tree.setRootVisible(false);
        tree.getSelectionModel().setSelectionMode
            (TreeSelectionModel.SINGLE_TREE_SELECTION);
        tree.addTreeSelectionListener((TreeSelectionEvent tse) -> {
            if (sortable) {
                output.setText("Click table column headers to sort.");
            }

            DefaultMutableTreeNode node = (DefaultMutableTreeNode)
                    tree.getLastSelectedPathComponent();

            if (node == null) return;

            Object nodeInfo = node.getUserObject();
            if (nodeInfo instanceof MediaData) {
                MediaData mediaData = (MediaData)nodeInfo;
                table.setModel( new DefaultTableModel(
                        mediaData.getData(),
                        mediaData.getColumnNames()) );
            }
        });

        for (int ii=0; ii<tree.getRowCount(); ii++) {
            tree.expandRow(ii);
        }

        String[] paths = path.split("\\|");
        int row = 0;
        TreePath treePath = null;
        for (String prefix : paths) {
            treePath = tree.getNextMatch( prefix, row, Position.Bias.Forward );
            row = tree.getRowForPath(treePath);
        }

        panel.add(new JScrollPane(tree),BorderLayout.WEST);

        tree.setSelectionPath(treePath);
        tree.scrollRowToVisible(row);
    }
}

class MediaData {

    String name;
    String[] columnNames;
    Object[][] data;

    MediaData(String name, String columnName, Object[] data) {
        this.name = name;

        columnNames = new String[1];
        columnNames[0] = columnName;

        this.data = new Object[data.length][1];
        for (int ii=0; ii<data.length; ii++) {
            this.data[ii][0] = data[ii];
        }
    }

    MediaData(String name, String[] columnNames, Object[][] data) {
        this.name = name;
        this.columnNames = columnNames;
        this.data = data;
    }

    @Override
    public String toString() {
        return name;
    }

    public String[] getColumnNames() {
        return columnNames;
    }

    public Object[][] getData() {
        return data;
    }
}

Other

You might also investigate:

  • InetAddress
  • KeyStore
  • Managers
    • CookieManager
    • KeyManagerFactory
    • LogManager
回复 原文
迷爱 2024-12-13 17:32:20

这个类打印很多东西到标准输出

import java.util.Properties;
import java.util.logging.LogManager;

import javax.net.ssl.KeyManagerFactory;
import java.util.Date;
import java.util.Enumeration;
import java.util.Locale;
import java.util.Map.Entry;
import java.awt.DisplayMode;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.ImageCapabilities;
import java.io.File;
import java.io.PrintStream;
import java.nio.file.Paths;
import java.security.KeyStore;
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class JavaInfo {

    public static PrintStream out = System.out;

    public static void printCurrentTime() {
        out.println("current date " + new Date());
        out.println("nano time "+System.nanoTime());        
    }

    public static void printSystemEnvironment() {
        for (Entry<String,String> e : System.getenv().entrySet())
            out.println(e.getKey()+" "+e.getValue());
    }

    public static void printSystemProperties() {
        Properties props = System.getProperties();
        Enumeration<Object> enums = props.keys();
        while (enums.hasMoreElements()) {
            String key = enums.nextElement().toString();
            out.println(key + " : " + props.getProperty(key));
        }
    }

    public static void printRuntimeMemory() {
        Runtime r = Runtime.getRuntime();
        out.println("free memory " + r.freeMemory());
        out.println("max memory " + r.maxMemory());
        out.println("total memory " + r.totalMemory());
    }

    public static void printCommandLineArguments() {
        out.print("JVM arguments");
        for (String arg : ManagementFactory.getRuntimeMXBean().getInputArguments())
            out.print(" "+arg);
        out.println();
    }

    public static void printClassLoaderInfo() {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        out.println("thread context class loader "+cl.getClass().getName());
        out.println("system class loader "+ClassLoader.getSystemClassLoader().getClass().getName());
        ClassLoadingMXBean cx = ManagementFactory.getClassLoadingMXBean();
        out.println("loaded classes count "+cx.getLoadedClassCount());
    }

    public static void printOSInfo() {
        OperatingSystemMXBean os = ManagementFactory.getOperatingSystemMXBean();
        out.println("OS name "+os.getName()+" version "+os.getVersion());
        out.println("architecture "+os.getArch());
        out.println("available processors "+os.getAvailableProcessors());
    }

    public static void printCPUUsage() {
        out.println("Current thread CPU time "+ManagementFactory.getThreadMXBean().getCurrentThreadCpuTime());
        out.println("number of threads "+ManagementFactory.getThreadMXBean().getThreadCount());     
        out.println("system load average "+ManagementFactory.getOperatingSystemMXBean().getSystemLoadAverage());        
    }

    public static void printDisplayInfo() {
        int g = 0;
        for (GraphicsDevice gd : GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()) {
            out.println("graphics device #"+(++g)+": "+gd.getIDstring()+" type "+gd.getType());
            out.println("\tavailable accelerated memory " + gd.getAvailableAcceleratedMemory());
            int c = 0;
            for (GraphicsConfiguration gc : gd.getConfigurations()) {
                out.println("\tgraphics configuration #"+(++c)+":");
                out.println("\t\twidth "+gc.getBounds().getWidth()+" height "+gc.getBounds().getHeight());
                out.println("\t\tfull screen "+gc.getBufferCapabilities().isFullScreenRequired());
                ImageCapabilities ic = gc.getImageCapabilities();
                out.println("\t\tis accelerated "+ic.isAccelerated());

            }
            DisplayMode dm = gd.getDisplayMode();   
            out.println("\tdisplay mode bit width "+dm.getWidth()+" height "+dm.getHeight()+" bit depth "+dm.getBitDepth()+" refresh rate "+dm.getRefreshRate());
            int m = 0;
            for (DisplayMode d : gd.getDisplayModes())
                out.println("\talt display mode #"+(++m)+" bit width "+d.getWidth()+" height "+d.getHeight()+" bit depth "+d.getBitDepth()+" refresh rate "+d.getRefreshRate());    
        }
    }

    public static void printFontsInfo() {
        out.println("available fonts: "+String.join(",", GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames()));
    }

    public static void printLocaleInfo() {
        out.println("default locale: "+Locale.getDefault().getDisplayName()+" country "+Locale.getDefault().getCountry()+" language "+Locale.getDefault().getLanguage());
        out.println("available locales:");
        for (Locale l : Locale.getAvailableLocales())
            out.println("\t"+l.getDisplayName()+" country "+l.getCountry()+" language "+l.getLanguage());
    }

    public static void printDiskInfo() {
        System.out.println("Current directory: "+Paths.get(".").toAbsolutePath().normalize().toString());
        File[] roots = File.listRoots();
        for (File r : roots) {
              out.println("File system root: " + r.getAbsolutePath());
              out.println("\tTotal space (bytes): " + r.getTotalSpace());
              out.println("\tFree space (bytes): " + r.getFreeSpace());
              out.println("\tUsable space (bytes): " + r.getUsableSpace());
              out.println("\tcan write "+r.canWrite());
            }
    }

    public static void printNetworkInfo() throws UnknownHostException {
        out.println("host name "+InetAddress.getLocalHost().getHostName());
        out.println("host IP address "+InetAddress.getLocalHost().getHostAddress());

    }

    public static void printSecurityInfo() throws UnknownHostException {
        SecurityManager security = System.getSecurityManager();
         if (security != null) {
             out.println("security manager "+security.getClass().getName()+" in check "+security.getInCheck());

         } else {
             out.println("no security manager");
         }
    }

    public static void printKeyManagerInfo() {
        out.println("key manager default algorithm "+KeyManagerFactory.getDefaultAlgorithm());      
        out.println("key store default type "+KeyStore.getDefaultType());
    }

    public static void printLoggingInfo() {
        for (String logger : LogManager.getLoggingMXBean().getLoggerNames()) {
            out.println("logger: \""+logger+"\" level \""+LogManager.getLoggingMXBean().getLoggerLevel(logger)+"\"");
        }

    }

    public static void main(String args []) throws Exception {

        out.println("****************************************");
        out.println("DATE INFO");
        printCurrentTime();
        out.println("");
        out.println("****************************************");
        out.println("JVM COMMAND LINE ARGUMENTS");
        printCommandLineArguments();
        out.println("");
        out.println("****************************************");
        out.println("ENVIRONMENT");
        printSystemEnvironment();
        out.println("");
        out.println("****************************************");
        out.println("SYSTEM PROPERTIES");
        printSystemProperties();
        out.println("");
        out.println("****************************************");
        out.println("CLASS LOADER");
        printClassLoaderInfo();
        out.println("");
        out.println("****************************************");
        out.println("OPERATING SYSTEM");
        printOSInfo();
        out.println("");
        out.println("****************************************");
        out.println("MEMORY");
        printRuntimeMemory();
        out.println("");
        out.println("****************************************");
        out.println("CPU");
        printCPUUsage();
        out.println("");
        out.println("****************************************");
        out.println("DISK");
        printDiskInfo();
        out.println("");
        out.println("****************************************");
        out.println("NETWORK");
        printNetworkInfo();
        out.println("");
        out.println("****************************************");
        out.println("SECURITY");
        printSecurityInfo();
        out.println("");
        out.println("");
        out.println("****************************************");
        out.println("LOG");
        printLoggingInfo();
        out.println("");
        out.println("****************************************");
        out.println("KEY MANAGER");
        printKeyManagerInfo();
        out.println("");
        out.println("****************************************");
        out.println("DISPLAY DEVICES");
        printDisplayInfo();
        out.println("");
        out.println("****************************************");
        out.println("FONTS");
        printFontsInfo();
        out.println("");
        out.println("****************************************");
        out.println("LOCALES");
        printLocaleInfo();
    }

}

This class prints quite a few stuff to stdout

import java.util.Properties;
import java.util.logging.LogManager;

import javax.net.ssl.KeyManagerFactory;
import java.util.Date;
import java.util.Enumeration;
import java.util.Locale;
import java.util.Map.Entry;
import java.awt.DisplayMode;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.ImageCapabilities;
import java.io.File;
import java.io.PrintStream;
import java.nio.file.Paths;
import java.security.KeyStore;
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class JavaInfo {

    public static PrintStream out = System.out;

    public static void printCurrentTime() {
        out.println("current date " + new Date());
        out.println("nano time "+System.nanoTime());        
    }

    public static void printSystemEnvironment() {
        for (Entry<String,String> e : System.getenv().entrySet())
            out.println(e.getKey()+" "+e.getValue());
    }

    public static void printSystemProperties() {
        Properties props = System.getProperties();
        Enumeration<Object> enums = props.keys();
        while (enums.hasMoreElements()) {
            String key = enums.nextElement().toString();
            out.println(key + " : " + props.getProperty(key));
        }
    }

    public static void printRuntimeMemory() {
        Runtime r = Runtime.getRuntime();
        out.println("free memory " + r.freeMemory());
        out.println("max memory " + r.maxMemory());
        out.println("total memory " + r.totalMemory());
    }

    public static void printCommandLineArguments() {
        out.print("JVM arguments");
        for (String arg : ManagementFactory.getRuntimeMXBean().getInputArguments())
            out.print(" "+arg);
        out.println();
    }

    public static void printClassLoaderInfo() {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        out.println("thread context class loader "+cl.getClass().getName());
        out.println("system class loader "+ClassLoader.getSystemClassLoader().getClass().getName());
        ClassLoadingMXBean cx = ManagementFactory.getClassLoadingMXBean();
        out.println("loaded classes count "+cx.getLoadedClassCount());
    }

    public static void printOSInfo() {
        OperatingSystemMXBean os = ManagementFactory.getOperatingSystemMXBean();
        out.println("OS name "+os.getName()+" version "+os.getVersion());
        out.println("architecture "+os.getArch());
        out.println("available processors "+os.getAvailableProcessors());
    }

    public static void printCPUUsage() {
        out.println("Current thread CPU time "+ManagementFactory.getThreadMXBean().getCurrentThreadCpuTime());
        out.println("number of threads "+ManagementFactory.getThreadMXBean().getThreadCount());     
        out.println("system load average "+ManagementFactory.getOperatingSystemMXBean().getSystemLoadAverage());        
    }

    public static void printDisplayInfo() {
        int g = 0;
        for (GraphicsDevice gd : GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()) {
            out.println("graphics device #"+(++g)+": "+gd.getIDstring()+" type "+gd.getType());
            out.println("\tavailable accelerated memory " + gd.getAvailableAcceleratedMemory());
            int c = 0;
            for (GraphicsConfiguration gc : gd.getConfigurations()) {
                out.println("\tgraphics configuration #"+(++c)+":");
                out.println("\t\twidth "+gc.getBounds().getWidth()+" height "+gc.getBounds().getHeight());
                out.println("\t\tfull screen "+gc.getBufferCapabilities().isFullScreenRequired());
                ImageCapabilities ic = gc.getImageCapabilities();
                out.println("\t\tis accelerated "+ic.isAccelerated());

            }
            DisplayMode dm = gd.getDisplayMode();   
            out.println("\tdisplay mode bit width "+dm.getWidth()+" height "+dm.getHeight()+" bit depth "+dm.getBitDepth()+" refresh rate "+dm.getRefreshRate());
            int m = 0;
            for (DisplayMode d : gd.getDisplayModes())
                out.println("\talt display mode #"+(++m)+" bit width "+d.getWidth()+" height "+d.getHeight()+" bit depth "+d.getBitDepth()+" refresh rate "+d.getRefreshRate());    
        }
    }

    public static void printFontsInfo() {
        out.println("available fonts: "+String.join(",", GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames()));
    }

    public static void printLocaleInfo() {
        out.println("default locale: "+Locale.getDefault().getDisplayName()+" country "+Locale.getDefault().getCountry()+" language "+Locale.getDefault().getLanguage());
        out.println("available locales:");
        for (Locale l : Locale.getAvailableLocales())
            out.println("\t"+l.getDisplayName()+" country "+l.getCountry()+" language "+l.getLanguage());
    }

    public static void printDiskInfo() {
        System.out.println("Current directory: "+Paths.get(".").toAbsolutePath().normalize().toString());
        File[] roots = File.listRoots();
        for (File r : roots) {
              out.println("File system root: " + r.getAbsolutePath());
              out.println("\tTotal space (bytes): " + r.getTotalSpace());
              out.println("\tFree space (bytes): " + r.getFreeSpace());
              out.println("\tUsable space (bytes): " + r.getUsableSpace());
              out.println("\tcan write "+r.canWrite());
            }
    }

    public static void printNetworkInfo() throws UnknownHostException {
        out.println("host name "+InetAddress.getLocalHost().getHostName());
        out.println("host IP address "+InetAddress.getLocalHost().getHostAddress());

    }

    public static void printSecurityInfo() throws UnknownHostException {
        SecurityManager security = System.getSecurityManager();
         if (security != null) {
             out.println("security manager "+security.getClass().getName()+" in check "+security.getInCheck());

         } else {
             out.println("no security manager");
         }
    }

    public static void printKeyManagerInfo() {
        out.println("key manager default algorithm "+KeyManagerFactory.getDefaultAlgorithm());      
        out.println("key store default type "+KeyStore.getDefaultType());
    }

    public static void printLoggingInfo() {
        for (String logger : LogManager.getLoggingMXBean().getLoggerNames()) {
            out.println("logger: \""+logger+"\" level \""+LogManager.getLoggingMXBean().getLoggerLevel(logger)+"\"");
        }

    }

    public static void main(String args []) throws Exception {

        out.println("****************************************");
        out.println("DATE INFO");
        printCurrentTime();
        out.println("");
        out.println("****************************************");
        out.println("JVM COMMAND LINE ARGUMENTS");
        printCommandLineArguments();
        out.println("");
        out.println("****************************************");
        out.println("ENVIRONMENT");
        printSystemEnvironment();
        out.println("");
        out.println("****************************************");
        out.println("SYSTEM PROPERTIES");
        printSystemProperties();
        out.println("");
        out.println("****************************************");
        out.println("CLASS LOADER");
        printClassLoaderInfo();
        out.println("");
        out.println("****************************************");
        out.println("OPERATING SYSTEM");
        printOSInfo();
        out.println("");
        out.println("****************************************");
        out.println("MEMORY");
        printRuntimeMemory();
        out.println("");
        out.println("****************************************");
        out.println("CPU");
        printCPUUsage();
        out.println("");
        out.println("****************************************");
        out.println("DISK");
        printDiskInfo();
        out.println("");
        out.println("****************************************");
        out.println("NETWORK");
        printNetworkInfo();
        out.println("");
        out.println("****************************************");
        out.println("SECURITY");
        printSecurityInfo();
        out.println("");
        out.println("");
        out.println("****************************************");
        out.println("LOG");
        printLoggingInfo();
        out.println("");
        out.println("****************************************");
        out.println("KEY MANAGER");
        printKeyManagerInfo();
        out.println("");
        out.println("****************************************");
        out.println("DISPLAY DEVICES");
        printDisplayInfo();
        out.println("");
        out.println("****************************************");
        out.println("FONTS");
        printFontsInfo();
        out.println("");
        out.println("****************************************");
        out.println("LOCALES");
        printLocaleInfo();
    }

}
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