java 执行shell命令遇到的坑

Runtime.getRuntime().exec(cmd);

public class TestController {

    @GetMapping("/exp")
    public void addHomePage(String cmd) throws InterruptedException, IOException {
        //创建子进程调用shell命令
        new MyThread(cmd).start();
    }
}

class MyThread extends Thread {
    String cmd;
    MyThread(String cmd)
    {
        this.cmd = cmd;
    }

    public void run(){
        Process proc = null;
        try {
            proc = Runtime.getRuntime().exec(cmd);
        } catch (IOException e) {
            e.printStackTrace();
        }
        //接收子进程的汇报信息和错误信息，避免阻塞
        new StreamGobbler(proc.getInputStream(),"INFO").start();
        new StreamGobbler(proc.getErrorStream(),"ERROR").start();

         //获取子进程执行结果状态
        int status= 0;
        try {
            status = proc.waitFor();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        if (status == 0){
            System.out.println("执行完毕");
        }else
            System.out.println("执行失败");

//销毁子进程
        proc.destroy();
    }
}

class StreamGobbler extends Thread
{
    InputStream is;
    String type;

    StreamGobbler(InputStream is, String type)
    {
        this.is = is;
        this.type = type;
    }

    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(type + ">" + line);
        } catch (IOException ioe)
        {
            ioe.printStackTrace();
        }
    }
}