本文實例為大家分享了Java實現UDP多線程在線咨詢，供大家參考，具體內容如下

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;//發送線程public class TalkSend implements Runnable { DatagramSocket socket = null; BufferedReader reader = null; private int formPort; //自身端口 private String toIP; //發送到的IP private int toPort; //發送到的端口 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)); //獲取控制臺輸入} catch (SocketException e) { e.printStackTrace();} } @Override public void run() {while(true) { try {String data = reader.readLine(); //獲取到的數據byte[] datas = data.getBytes(); //轉換為需要的字節數組//將數據打包成包DatagramPacket packet = new DatagramPacket(datas,0, datas.length,new InetSocketAddress(this.toIP,this.toPort));socket.send(packet); //發送包//退出指令if(packet.equals('bye')){ break;} } catch (IOException e) {e.printStackTrace(); }}socket.close(); }}2.接收的線程

import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.SocketException;//接收線程public class TalkReceive implements Runnable { DatagramSocket socket = null; //與發送端的socket為同一個，實現通信 private int port; private String msgFrom; //標志信息來源 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);//接收數據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.模擬學生端

//模擬學生public class TalkStudent { public static void main(String[] args) {new Thread(new TalkSend(7777, 'localhost', 9999)).start();new Thread(new TalkReceive(8888, '老師')).start(); }}4.模擬老師端

//模擬老師public class TalkTeacher { public static void main(String[] args) {new Thread(new TalkSend(5555, 'localhost', 8888)).start();new Thread(new TalkReceive(9999, '學生')).start(); }}5.截圖

學生端：

老師端：

首先創建一個發送線程，里面定義要發送到的IP地址和端口，再創建一個DatagramSocket來進行通信，創建一個BufferReader(new InputStreamReader(System.in))來獲取控制臺的輸入的數據，將獲取到的數據打包進行發送。之后創建一個接收線程，里面定義自身的端口即可，再創建一個和發送端一樣的DatagramSocket來進行通信，接收數據進行打印輸出即可。最后模擬學生端和老師端，創建這兩個線程來進行通信。學生發送線程到的端口是老師的接收端口，老師發送的端口是學生的接收端口，這樣才能互相通信。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。