在 Java 中运行命令行

Question

有没有办法在 Java 应用程序中运行此命令行？

java -jar map.jar time.rel test.txt debug

我可以用命令运行它，但我无法在 Java 中运行它。

Answer 1

Runtime rt = Runtime.getRuntime();
Process pr = rt.exec("java -jar map.jar time.rel test.txt debug");

http://docs.oracle.com/javase/7 /docs/api/java/lang/Runtime.html

Answer 2

您还可以像这样观察输出：

final Process p = Runtime.getRuntime().exec("java -jar map.jar time.rel test.txt debug");

new Thread(new Runnable() {
    public void run() {
        BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String line = null;

        try {
            while ((line = input.readLine()) != null)
                System.out.println(line);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}).start();

p.waitFor();

并且不要忘记，如果您正在运行 Windows 命令，则需要将 cmd /c 放在命令前面。

编辑：为了获得奖励积分，您还可以使用 ProcessBuilder 将输入传递给程序：

String[] command = new String[] {
        "choice",
        "/C",
        "YN",
        "/M",
        "\"Press Y if you're cool\""
};
String inputLine = "Y";

ProcessBuilder pb = new ProcessBuilder(command);
pb.redirectErrorStream(true);
Process p = pb.start();
BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(p.getOutputStream()));

writer.write(inputLine);
writer.newLine();
writer.close();

String line;

while ((line = reader.readLine()) != null) {
    System.out.println(line);
}

这将运行 Windows 命令choice /C YN /M“Press Y if you're Cool” 并用 Y 响应。所以，输出将是：

Press Y if you're cool [Y,N]?Y

Answer 3

为了避免被调用的进程在标准输出上输出大量数据和/或错误时被阻止，您必须使用 Craigo 提供的解决方案。另请注意，ProcessBuilder 优于 Runtime.getRuntime().exec()。这有几个原因：它更好地标记参数，并且还处理错误标准输出（另请检查 此处）。

ProcessBuilder builder = new ProcessBuilder("cmd", "arg1", ...);
builder.redirectErrorStream(true);
final Process process = builder.start();

// Watch the process
watch(process);

我使用新函数“watch”在新线程中收集这些数据。当被调用进程结束时，该线程将在调用进程中完成。

private static void watch(final Process process) {
    new Thread() {
        public void run() {
            BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line = null; 
            try {
                while ((line = input.readLine()) != null) {
                    System.out.println(line);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }.start();
}

Answer 4

Runtime.getRuntime().exec("java -jar map.jar time.rel test.txt debug");

Answer 5

import java.io.*;

Process p = Runtime.getRuntime().exec("java -jar map.jar time.rel test.txt debug");

如果您遇到任何其他问题，请考虑以下内容，但我猜上述内容对您有用：

Runtime.exec() 的问题

Answer 6

怎么样

public class CmdExec {

public static Scanner s = null;


public static void main(String[] args) throws InterruptedException, IOException {
    s = new Scanner(System.in);
    System.out.print("$ ");
    String cmd = s.nextLine();
    final Process p = Runtime.getRuntime().exec(cmd);

    new Thread(new Runnable() {
        public void run() {
            BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String line = null; 

            try {
                while ((line = input.readLine()) != null) {
                    System.out.println(line);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }).start();

    p.waitFor();
     }

 }

Answer 7

您是否尝试过 Runtime 类中的 exec 命令？

Runtime.getRuntime().exec("java -jar map.jar time.rel test.txt debug")

运行时- Java文档

Answer 8

Process p = Runtime.getRuntime().exec("java -jar map.jar time.rel test.txt debug");