Java执行cmd命令工具类

工具类：

public class CmdTask implements Runnable {
    private String command;
    private String dirPath;

    public CmdTask(String dirPath, String command) {
        this.dirPath = dirPath;
        this.command = "cmd.exe /c " + command;;
    }

    @Override
    public void run() {
        Process process = null;
        int exitVal = 0;
        try {
            process = Runtime.getRuntime().exec(command, null, new File(dirPath));
            // Runtime.exec()创建的子进程公用父进程的流，不同平台上，父进程的stream buffer可能被打满导致子进程阻塞，从而永远无法返回。
            //针对这种情况，我们只需要将子进程的stream重定向出来即可。
            new RedirCmdStreamThread(process.getInputStream(), "INFO").start();
            new RedirCmdStreamThread(process.getErrorStream(), "ERR").start();

            exitVal = process.waitFor();
        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }

        if (exitVal != 0) {
            throw new RuntimeException("cmd任务执行失败");
        }
    }

    class RedirCmdStreamThread extends Thread {
        InputStream is;
        String printType;

        RedirCmdStreamThread(InputStream is, String printType) {
            this.is = is;
            this.printType = printType;
        }

        public void run() {
            try {
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);
                String line = null;
                while ((line = br.readLine()) != null) {
                    System.out.println(printType + ">" + line);
                }

            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
        }
    }
}

工具类使用案例：

command = "cmd.exe /c ffmpeg -i video.m4s -i audio.m4s -codec copy " + abPath;
new CmdTask(videoPath,command).run();