Java实现UDP多线程在线咨询

本文实例为大家分享了Java实现UDP多线程在线咨询，供大家参考，具体内容如下

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;//发送线程public class TalkSend implements Runnable { DatagramSocket socket = null; BufferedReader reader = null; private int formPort; //自身端口 private String toIP; //发送到的IP private int toPort; //发送到的端口 public TalkSend(int formPort, String toIP, int toPort) {this.formPort = formPort;this.toIP = toIP;this.toPort = toPort;try { socket = new DatagramSocket(formPort); reader = new BufferedReader(new InputStreamReader(System.in)); //获取控制台输入} catch (SocketException e) { e.printStackTrace();} } @Override public void run() {while(true) { try {String data = reader.readLine(); //获取到的数据byte[] datas = data.getBytes(); //转换为需要的字节数组//将数据打包成包DatagramPacket packet = new DatagramPacket(datas,0, datas.length,new InetSocketAddress(this.toIP,this.toPort));socket.send(packet); //发送包//退出指令if(packet.equals('bye')){ break;} } catch (IOException e) {e.printStackTrace(); }}socket.close(); }}2.接收的线程

import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.SocketException;//接收线程public class TalkReceive implements Runnable { DatagramSocket socket = null; //与发送端的socket为同一个，实现通信 private int port; private String msgFrom; //标志信息来源 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 {byte[] container = new byte[1024];DatagramPacket packet = new DatagramPacket(container, 0, container.length);socket.receive(packet);//接收数据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(); }}3.模拟学生端

//模拟学生public class TalkStudent { public static void main(String[] args) {new Thread(new TalkSend(7777, 'localhost', 9999)).start();new Thread(new TalkReceive(8888, '老师')).start(); }}4.模拟老师端

//模拟老师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(); }}5.截图

学生端：

老师端：

首先创建一个发送线程，里面定义要发送到的IP地址和端口，再创建一个DatagramSocket来进行通信，创建一个BufferReader(new InputStreamReader(System.in))来获取控制台的输入的数据，将获取到的数据打包进行发送。之后创建一个接收线程，里面定义自身的端口即可，再创建一个和发送端一样的DatagramSocket来进行通信，接收数据进行打印输出即可。最后模拟学生端和老师端，创建这两个线程来进行通信。学生发送线程到的端口是老师的接收端口，老师发送的端口是学生的接收端口，这样才能互相通信。

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