如何在Jpasswordfield中添加眼睛符号？

Question

如何使用Java Swing在Java应用程序中添加眼睛符号？

Answer 1

您可以实现多种方式。在以下代码中，我创建a jpanel 包含a 和a jlabel> jlabel 显示“ EYE” ICON。我删除 border> border 来自代码>。 （请注意，默认情况下，jlabel没有边框。）我在jpanel中添加了一个边框，使其看起来像一个单个文本字段。我从接受的答案中得到了这个想法在Jtextfield（Java）内。最后，我添加a mouselisteristener。当鼠标指针在jlabel内部时，jpasswordfield中的文本是可读的，并且鼠标指针不在jlabel中时，文本在jpasswordfield中显示为星号字符串，即*。

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.net.URL;

import javax.swing.BorderFactory;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.border.BevelBorder;

public class PassWord extends MouseAdapter {
    private JFrame frame;
    private JPasswordField  passwordField;

    public void mouseEntered(MouseEvent event) {
        passwordField.setEchoChar('\u0000');
    }

    public void mouseExited(MouseEvent event) {
        passwordField.setEchoChar('*');
    }

    private void buildAndDisplayGui() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(createEye(), BorderLayout.PAGE_START);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JPanel createEye() {
        JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEADING, 0, 0));
        panel.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
        passwordField = new JPasswordField(15);
        passwordField.setBorder(null);
        panel.add(passwordField);
        URL location = getClass().getResource("eye_show_password.png");
        Icon ico = new ImageIcon(location);
        JLabel label = new JLabel(ico);
        label.setOpaque(true);
        label.setBackground(passwordField.getBackground());
        label.addMouseListener(this);
        panel.add(label);
        JPanel container = new JPanel();
        container.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        container.add(panel);
        return container;
    }

    public static void main(String args[]) {
        EventQueue.invokeLater(() -> new PassWord().buildAndDisplayGui());
    }
}