java 如何调用shell

调用Shell命令的方法

在Java中调用Shell命令可以通过Runtime或ProcessBuilder类实现。以下是具体实现方式：

使用Runtime.exec()

try {
    Process process = Runtime.getRuntime().exec("ls -l");
    BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
    String line;
    while ((line = reader.readLine()) != null) {
        System.out.println(line);
    }
    int exitCode = process.waitFor();
    System.out.println("Exit code: " + exitCode);
} catch (Exception e) {
    e.printStackTrace();
}

使用ProcessBuilder

try {
    ProcessBuilder builder = new ProcessBuilder("ls", "-l");
    builder.redirectErrorStream(true);
    Process process = builder.start();

    BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
    String line;
    while ((line = reader.readLine()) != null) {
        System.out.println(line);
    }
    int exitCode = process.waitFor();
    System.out.println("Exit code: " + exitCode);
} catch (Exception e) {
    e.printStackTrace();
}

处理复杂命令

对于包含管道或重定向的复杂命令，可以直接调用Shell解释器：

Process process = new ProcessBuilder("/bin/sh", "-c", "ls -l | grep .txt").start();

注意事项

• 命令参数建议分开传递，避免注入风险
• 始终检查命令执行结果（通过exitCode）
• 及时处理输入输出流，避免进程阻塞
• 对于长时间运行的命令，可能需要超时控制