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。
