Java Socket编程之多线程实现C/S一对多（服务端无法发送数据）

Server端：

package com.wjy.server;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;
/*
 * caution:boot the server first.
 * @author JiyuanWang
 *
 */
public class TalkServer extends JFrame implements ActionListener,Runnable{
    private  JButton send=null;
    private  JTextField inputText=null;
    private  JTextArea showText=null;
    private  ServerSocket serverSocket=null;
    private DataOutputStream out=null;
    public TalkServer(){
    }
public  void handle()
{
    try {
        serverSocket=new ServerSocket(4170, 5);
        
        while (true) {
            Socket socket=serverSocket.accept();
            showText.append("Connect successd.\n");
            Thread thread=new ThreadHandle(socket);
            thread.start();
            
        }
        
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    
}
@Override
public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub    
        /*try {
            out.writeUTF(inputText.getText());
            out.flush();//本人一直把这个程序调试不通，最后发现没加这句话导致服务端显示不了客户端的输入。
            showText.append("I said: "+inputText.getText()+"\n");
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }*/
}
@Override
public void run() {
    // TODO Auto-generated method stub
    send=new JButton("Send");
    send.addActionListener(this);
    send.setEnabled(true);
    
    inputText=new JTextField();
    
    showText=new JTextArea();
    
    add(send,BorderLayout.NORTH);
    add(inputText, BorderLayout.SOUTH);
    add(showText, BorderLayout.CENTER);
    
    setTitle("Server");
    setBounds(1000,0,400,400);
    setVisible(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    handle();
}
private class ThreadHandle extends Thread{
    private Socket midSocket;
    public ThreadHandle(Socket midSocket){
        this.midSocket=midSocket;
    }
    public void run() {
        
        try {
            DataInputStream dataInputStream=new DataInputStream(midSocket.getInputStream());
            DataOutputStream dataOutputStream=new DataOutputStream(midSocket.getOutputStream());
            while(true){
            showText.append("Client said: "+dataInputStream.readUTF()+"\n");
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}
}

Client端：

package com.wjy.client;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

/**
 * caution:boot the server first.
 * @author JiyuanWang
 *
 */

public class TalkClient extends JFrame implements ActionListener,Runnable{
    private  JButton send=null;
    private  JTextField inputText=null;
    private  JTextArea showText=null;
    private  Socket socket=null;
    private  DataInputStream inputStreamReader=null;
    private  DataOutputStream outputStreamWriter=null;
    public TalkClient(){
    }
public void handle()
{
    try {
        socket=new Socket("127.0.0.1",4170);
        inputStreamReader=new DataInputStream(socket.getInputStream());
        outputStreamWriter=new DataOutputStream(socket.getOutputStream());
        while(true){
            showText.append("The Server said: "+inputStreamReader.readUTF()+"\n");
        }
    } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
@Override
public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    try {
        outputStreamWriter.writeUTF(inputText.getText());
        outputStreamWriter.flush();   //本人一直把这个程序调试不通，最后发现没加这句话导致服务端显示不了客户端的输入。
        showText.append("I said: "+inputText.getText()+"\n");
    } catch (IOException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
}
@Override
public void run() {
    // TODO Auto-generated method stub
    send=new JButton("Send");
    send.addActionListener(this);
    send.setEnabled(true);
    
    inputText=new JTextField();
    
    showText=new JTextArea();
    
    add(send,BorderLayout.NORTH);
    add(inputText, BorderLayout.SOUTH);
    add(showText, BorderLayout.CENTER);
    
    setTitle("Client");
    setBounds(0,0,400,400);
    setVisible(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    handle();
}
}

main函数：

package start;

import java.io.IOException;
import java.net.ServerSocket;

import com.wjy.client.TalkClient;
import com.wjy.server.TalkServer;

public class start {
public static void main(String[] args){
    Thread server=new Thread(new TalkServer());
    Thread clientA=new Thread(new TalkClient()); 
    Thread clientB=new Thread(new TalkClient()); 
    server.start();
    clientA.start();
    clientB.start();
}
}