如何在java

Question

我有一个需要使用ProcessBuilder启动进程的场景。成功启动流程后，打开创建流程的输入流和输出流，并通过输出流传递参数，并通过输入流检索结果。

它在第一次执行过程中工作正常。 但是如果我需要循环多次，并且将不同的参数传递给同一个创建的进程，则它会失败并且Process.isAlive（）将返回false。

在我们的场景中，该过程只需要启动一次。 因此，请帮助我使流程保持活跃，并使用相同的流程来完成所有功能。

代码段

ProcessBuilder pb = new ProcessBuilder(command);
Process p = pb.start();
ServerSocket server = new ServerSocket(8765);
PrintWriter pw = new PrintWriter(p.getOutputStream());
BufferedReader br = new BufferedReader( new 
InputStreamReader(p.getInputStream()) );
while(true){

    System.out.println("The p value is "+p.isAlive());

    //server waiting for client to connect
    Socket sock = server.accept();

    //reading the argument for the "command"
    DataInputStream dis = new DataInputStream(sock.getInputStream());
    String  arg=(String)dis.readUTF();
    System.out.println("data received is = "+arg);


    //code for executing the process p(command) with the arguments received from socket
    pw.println(arg);
    pw.flush();
    pw.close();

    String line = "";
    String result ="";
    //storing the result of the final_cmd with arguments in the result string                
    while ((line = br.readLine()) != null) {
        result=result+line+System.lineSeparator();
    }

    //result returning back to socket      
    DataOutputStream dout=new DataOutputStream(sock.getOutputStream());  
    dout.writeUTF(result);  
    dout.flush();  
}