linux Java进程IO

Question

我在linux中使用java启动GNOME终端进程，并将其输入和输出重定向到我的代码。下面是一个代码

        public static void main(String[] args) throws InterruptedException
    {
        // TODO Auto-generated method stub  /usr/bin/telnet
        try
        {
            String line, commandInput;
            Scanner scan =  new Scanner(new File("/home/Ashutosh/Documents/testfile"));
            ProcessBuilder telnetProcessBuilder = new ProcessBuilder("/bin/bash");///home/Ashutosh/Documents/tempScript");
            telnetProcessBuilder.redirectErrorStream(true);
            Process telnetProcess = telnetProcessBuilder.start();
            //Process telnetProcess = Runtime.getRuntime().exec("xterm");///home/Ashutosh/Documents/tempScript");
            BufferedReader input = new BufferedReader(new InputStreamReader(telnetProcess.getInputStream()));
            BufferedWriter output = new BufferedWriter(new OutputStreamWriter(telnetProcess.getOutputStream()));
            while(scan.hasNext())
            {
                commandInput = scan.nextLine();
                output.write(commandInput);
/*              if(commandInput.trim().equals("exit"))
                {
                    output.write("exit\r");
                }
                else
                {
                    output.write("((" + commandInput + ") && echo --EOF--) || echo --EOF--\r");
                }
*/              output.flush();
                line = input.readLine();
                while(line != null && !line.trim().equals("--EOF--"))
                {
                    System.out.println(line);
                    line = input.readLine();
                }
                if(line == null)
                    break;
            }
/*          Thread.sleep(500);
            output.write("/home/Ashutosh/Documents/testfile\r");
            Thread.sleep(500);
            output.flush();

            while((line = input.readLine())!= null)
                System.out.println(line);
            telnetProcess.destroy();
*/          //String s = input.readLine();
            //System.out.print(s + "\r\n");
            //s = input.readLine();
            //System.out.print(s + "\r\n");
        }

testfile是bash脚本，它的内容是

#!/bin/bash

ls -l
pwd
date
exit

我还尝试了下面的交互式脚本，它从用户那里获取输入，我想从java代码中重定向

#! /bin/bash
echo "Input any number form 0-3:"
read num
case $num in
  0) echo "You are useless";;
  1) echo "You are number 1";;
  2) echo "Too suspecious";;
  3) echo "Thats all man, got to go...!";;
  *) echo "Cant't u read english, this is wrong choice";;
esac
read
exit

我的代码停在input.readLine();我不确定，但我想我无法重定向输出流

output.write(commandInput);

命令执行得很好，但没有在进程重定向输入上写入我想要的内容，这就是它挂起的原因。 如果有人已经解决了，请告诉我解决方案。 通过以下链接，我试图解决这个问题，但仍然没有成功：

Java Process with Input/Output Stream

谢谢

阿什图什