java:生成新线程导致原始线程停止

java:生成新线程导致原始线程停止,java,multithreading,Java,Multithreading,我有下面的代码,其中我生成了一个线程listen,它应该持续侦听任何传入的TCP消息,在该线程运行后,我希望主线程用于发送消息,但一旦我启动listen.run(),主线程似乎就不再运行了。我希望它继续运行while循环,但它永远不会到达它 package tcpclient; import java.io.*; import java.net.*; import java.net.UnknownHostException; import java.util.Scanner; import j

我有下面的代码,其中我生成了一个线程listen,它应该持续侦听任何传入的TCP消息,在该线程运行后,我希望主线程用于发送消息,但一旦我启动listen.run(),主线程似乎就不再运行了。我希望它继续运行while循环,但它永远不会到达它

package tcpclient;

import java.io.*;
import java.net.*;
import java.net.UnknownHostException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

public class client {
//instance vars
static Socket cSocket =null;
static PrintWriter out = null;
static BufferedReader in = null;

//server info
static String serverName = null;
static int serverPort = 0;
static String userName=null;

//listening vars
static Thread listen;
static  String incoming=null;

/**
 * @param args the command line arguments
 */
public static void main(String[] args) throws IOException {
    try {
        System.out.println("\n\n\nTCP Chat Client\n\nEnter server name:");
        Scanner scan = new Scanner(System.in);

        //get server info from user
        serverName = scan.nextLine();

        System.out.println("\nEnter port number:");
        serverPort = Integer.parseInt(scan.nextLine());


        System.out.println("\nEnter your username:");
        userName = scan.nextLine();

        //make connection to server
        cSocket = new Socket(serverName, serverPort);
        out = new PrintWriter(cSocket.getOutputStream(), true);
        in = new BufferedReader(new InputStreamReader(cSocket.getInputStream()));

        //send username to server
        out.println(userName);

        //start listening
        listen = new Thread(){
            @Override
                public void run(){
                try {
                    incoming = in.readLine();
                    while (!(incoming.equals(null))) {
                        System.out.print(incoming);


incoming = in.readLine();

                    }
                } catch (IOException ex) {
                    Logger.getLogger(client.class.getName()).log(Level.SEVERE, null, ex);
                }
            }

        };
        listen.run();
        String rcvrname="wefwef";
        String message=null;
        //start messaging
        while(!(rcvrname.equals("exit"))){
            System.out.println("Enter reciever name");
            out.println(scan.nextLine());
            System.out.println("Enter message");
            out.println(scan.nextLine());

        }
        out.close();
        in.close();
        cSocket.close();

    }

    catch (UnknownHostException ex) {
        System.err.println("\ncan't find that host\n");

    }

    catch (IOException ex) {
        Logger.getLogger(client.class.getName()).log(Level.SEVERE, null, ex);
    }

   finally{
        in.close();
        out.close();
        cSocket.close();
   }


}
}您想要:

listen.start();
不是

由于Java 5,执行此操作的首选方法也是使用
ExecutorService

Runnable listen = new Runnable() {
  public void run() { ... }
}
ExecutorService exec = Executors.newSingleThreadExecutor();
exec.submit(listen);
当你想阻止它时:

exec.shutdown();
exec.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
或者简单地说:

exec.shutdownNow();
问题是:

listen.run();

您不能调用
run()
本身!你应该调用<代码> Stand()>代码>,这会产生一个线程,调用<代码> Run()>代码>只需调用一个函数。

只是出于好奇,为什么你要在主(中间)中间定义你的新线程?在单独的私有类中定义它不是更好的编码方式吗?
listen.run();