本文实例为大家分享了Java实现多线程在线聊天的具体代码，供大家参考，具体内容如下
上一篇博客通过UDP实现了聊天，但只能单方面发送消息，这次实现了多线程在线聊天，也就是可以双方互发消息。
发送消息：
package com.kuang.chat;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetSocketAddress;import java.net.SocketException;public class TalkSend implements Runnable { DatagramSocket socket = null; BufferedReader reader = null; private int fromPort; private String toIP; private int toPort; public TalkSend(int fromPort, String toIP, int toPort) { this.fromPort = fromPort; this.toIP = toIP; this.toPort = toPort; try { socket = new DatagramSocket(fromPort); reader = new BufferedReader(new InputStreamReader(System.in)); } catch (Exception e) { e.printStackTrace(); } } @Override public void run() { while (true) { try { String data = reader.readLine(); byte[] datas = data.getBytes(); DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress(this.toIP,this.toPort)); socket.send(packet); if (data.equals("bye")) { break; } } catch (IOException e) { e.printStackTrace(); } } socket.close(); }}
接收消息：
package com.kuang.chat;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.SocketException;public class TalkReceive implements Runnable { DatagramSocket socket = null; private int port; private String msgFrom; public TalkReceive(int port,String msgFrom) { this.port = port; this.msgFrom = msgFrom; try { socket = new DatagramSocket(port); } catch (SocketException e) { e.printStackTrace(); } } @Override public void run() { while (true) { try { //准备接收数据 byte[] container = new byte[1024]; DatagramPacket packet = new DatagramPacket(container,0,container.length); socket.receive(packet);//阻塞式接受包裹 //断开连接 bye byte[] data = packet.getData(); String receiveData = new String(data,0,data.length); System.out.println(msgFrom + ":" +receiveData); if (receiveData.equals("bye")) { break; } } catch (IOException e) { e.printStackTrace(); } } socket.close(); }}
用户1：学生
package com.kuang.chat;public class TalkStudent { public static void main(String[] args) { //开启两个线程 new Thread(new TalkSend(7777,"localhost",9999)).start(); new Thread(new TalkReceive(8888,"老师")).start(); }}
用户2：老师
package com.kuang.chat;public class TalkTeacher { public static void main(String[] args) { new Thread(new TalkSend(5555,"localhost",8888)).start(); new Thread(new TalkReceive(9999,"学生")).start(); }}
运行结果：
1、启动学生端，开始运行
2、启动教师端，开始运行
3、学生发送消息，教师收到
4、教师发送消息，学生收到
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
也有伤心的，既有令人兴奋的，也有令人灰心的，
