Java进程IO

Question

使用java在Linux中启动GNOME终端进程并将其输入和输出重定向到我的代码。以下是一个代码。

 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的内容是bash脚本是

#!/bin/bash 

ls -l 
pwd 
date 
exit 

，我也尝试了以下交互式脚本这需要输入从用户我想从Java代码重定向给出

#! /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();即时通讯不知道，但我认为我无法重定向输出流

output.write(commandInput); 

命令运行良好，但没有写入我打算在进程重定向输入，这就是为什么它挂起在readLine();。 如果有人已经解决了请让我知道解决方案。 从下面的链接，我试图解决这个问题，但仍然没有运气：

Java Process with Input/Output Stream

感谢

Ashutosh说

Answer 1

嗨，大家抱歉，迟到的反应，经过一些审判后，我得到它的工作。我只是让进程完成它的过程和正常退出，而不是强制，然后的BufferedReader和BufferedWriter将保持在RAM中的字符串缓冲区，我可以现在进程退出后，用代码彼得，即使在0

public static void main(String[] args) throws InterruptedException 
{ 
    // TODO Auto-generated method stub 
    try 
    { 
     String line, commandInput; 
     ProcessBuilder telnetProcessBuilder = new ProcessBuilder("/bin/bash"); 
     telnetProcessBuilder.redirectErrorStream(true); 
     Process telnetProcess = telnetProcessBuilder.start(); 
     BufferedReader input = new BufferedReader(new InputStreamReader(telnetProcess.getInputStream())); 
     BufferedWriter output = new BufferedWriter(new OutputStreamWriter(telnetProcess.getOutputStream())); 
     commandInput = "ls -l\n"; 
     output.write(commandInput); 
     output.flush(); 
     commandInput = "pwd\n"; 
     output.write(commandInput); 
     output.flush(); 
     commandInput = "whoami\n"; 
     output.write(commandInput); 
     output.flush(); 
     commandInput = "exit\n"; 
     output.write(commandInput); 
     output.flush(); 
     while((line = input.readLine())!= null) 
      System.out.println(line); 
    } 
} 

Answer 2

的readLine（）读取一行内容，不换行末。 （）只写入文本，它不会添加新行。

也许你想添加写（“\ n”）;或使用PrintStream或PrintWriter。

我想，你的脚本来发送的

#!/bin/bashls -lpwddateexit 

这是一个没有换行的注释。

Answer 3

编辑：巨大的错误，没有添加到ProcessBuilder的命令！

为什么不只是将脚本作为Linux脚本运行？也就是说，

ProcessBuilder builder = new ProcessBuilder(); 
LinkedList<String> command = new LinkedList<String>(); 
command.add("/bin/bash"); 
command.add("/home/Ashutosh/Documents/testfile"); 
builder.command(command); 

Process myProc = builder.start(); 

而且，我注意到变量被命名为“telnetProcess”尚没有远程登录的调用的任何地方，我可以看到。也许这是问题？

编辑：添加我的建议下面的交互式脚本。

ProcessBuilder builder = new ProcessBuilder(); 
LinkedList<String> command = new LinkedList<String>(); 
command.add("/bin/bash"); 
command.add("/path/to/interactiveScript"); 
builder.command(command); 

final Process myProc = builder.start(); 

// Java input goes to process input. 
Thread inputParser = new Thread() { 
    public void run() { 
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); 
    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(myProc.getOutputStream())); 
    String line = ""; 
    while(line != null) { 
     line = br.readLine(); 
     bw.write(line); 
     bw.newLine(); 
    } 
    } 
}.start(); 

// Process output must go to Java output so user can see it! 
Thread outputParser = new Thread() { 
    public void run() { 
    BufferedReader br = new BufferedReader(new InputStreamReader(myProc.getInputStream())); 
    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out)); 
    String line = ""; 
    while(line != null) { 
     line = br.readLine(); 
     bw.write(line); 
     bw.newLine(); 
    } 
    } 
}.start();