如何将Enter键从Java应用程序传递到命令行

Question

I am writing a java program which will run some installed tools on a Linux Ubuntu OS, I need to execute two consecutive commands in the same process but with making the first one execute completely and then call the second one. I have tried using "\\n" to separate the two commands as in the following code, but It didn't work.

public static void main (String args[])
{
    List<String> command = new ArrayList<String>();
    command.add("spin");
    command.add("-p");
    command.add("-u100");
    command.add("D:\\promela\\peterson.pml");
    command.add("\n");
    command.add("cc -o pan pan.c");
    command.add("./pan");


    String[] commandArray = command.toArray(new String[command.size()]);
    ProcessBuilder pb = new ProcessBuilder(commandArray);
    Process process;
    try {

          process = pb.start();

          BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
          BufferedReader errReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
          String errline, outline;


          for(String s : command)
           {
             System.out.println(s + " ");
           }

           while ((outline = br.readLine()) != null)
           {
             System.out.println(outline);
           }

           while ((errline = errReader.readLine()) != null)
           {
              System.err.println(errline);
           }


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

    }
}

Answer 1

I don't think it can be done:

• Either you launch a terminal/console/bash process, in which you can "type" commands, or
• you launch a specific executable that can't parse those commands and it won't work.

Wouldn't it be easier to start 2 processes?

Side note: you should not read the out and err streams one after the other, you should read them in parallel in separate threads, or, easier, use ProcessBuilder#redirectErrorStream so you only need to read from one stream (out).