利用网络Socket和多线程实现一个双向聊天

接收键盘输入然后向对方发送消息的线程

 package cn.com.chat;

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
 import java.net.Socket;

 /**
  *
  * @author Xiaofei
  *
  */
 public class SendMsgThread extends Thread{
     /**
      * 用来接收键盘输入然后向对方发送消息的线程
      */
     Socket ss = null;
     BufferedWriter bw = null;
     BufferedReader br = null;
     public SendMsgThread(Socket ss){
         this.ss = ss;
         try {
             bw = new BufferedWriter(new OutputStreamWriter(ss.getOutputStream()));
             br = new BufferedReader(new InputStreamReader(System.in));
         } catch (IOException e) {
             // TODO 自动生成的 catch 块
             e.printStackTrace();
         }
     }
     public void run(){
             try {
                 while(true){
                     String str;
                     str = br.readLine();
                     if(str.equals("exit")){
                         System.exit(0);
                     }else{
                         bw.write(str+"\n");
                         bw.flush();
                     }
                 }
             } catch (IOException e) {
                 // TODO 自动生成的 catch 块
                 e.printStackTrace();
             }finally{
                 try {
                     bw.close();
                     br.close();
                 } catch (IOException e) {
                     // TODO 自动生成的 catch 块
                     e.printStackTrace();
                 }
             }
         }
 }

服务端：Server

package cn.com.chat;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) {
        ServerSocket server = null;
        Socket socket = null;
        BufferedReader br= null;
        try {
            server = new ServerSocket(88);
            socket = server.accept();
            new SendMsgThread(socket).start();
            br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            while(true){
                String str = br.readLine();
                System.out.println("客户端：\n"+str);
            }
        } catch (IOException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }finally{
            try {
                br.close();
                server.close();
            } catch (IOException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
        }
    }

}

客户端：Client

 package cn.com.chat;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.net.Socket;

 public class Client {
     public static void main(String[] args) {
         Socket socket = null;
         BufferedReader br = null;
         try {
             socket = new Socket("192.168.16.111", 88);
             System.out.println("请输入您的消息：");
             new SendMsgThread(socket).start();
             br = new BufferedReader(new InputStreamReader(
                     socket.getInputStream()));
             while (true) {
                 String str = br.readLine();
                 System.out.println("客户端：\n" + str);
             }
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             try {
                 br.close();
                 socket.close();
             } catch (IOException e) {
                 // TODO 自动生成的 catch 块
                 e.printStackTrace();
             }
         }
     }

 }

特别提醒一点：注意启动的顺序，现实启动服务端，再启动客户端。现有接收的服务器，客户端才能够获得服务端的端口和IP。