在java中如何使用udp，下面一個(gè)例子進(jìn)行演示，關(guān)鍵： DatagramSocket、DatagramPacket

服務(wù)端

package com.luoq.udp;import java.net.DatagramPacket; import java.net.DatagramSocket; import java.nio.charset.StandardCharsets;public class UDPServer {private static final int MAX_SIZE = 1024;private static final int PORT = 8080;public static void main(String[] args) {DatagramSocket socket = null;try {socket = new DatagramSocket(PORT);System.out.println("UDP 服務(wù)端啟動(dòng)..");int index = 0;while (true) {index++;byte[] buffer = new byte[MAX_SIZE];DatagramPacket packet = new DatagramPacket(buffer, buffer.length);// 一直阻塞，直到有客戶端的數(shù)據(jù)發(fā)送過(guò)來(lái)socket.receive(packet);// 客戶端發(fā)送的數(shù)據(jù)byte[] dataBytes = packet.getData();String data = new String(dataBytes, 0, packet.getLength(), StandardCharsets.UTF_8);System.out.println("服務(wù)端收到數(shù)據(jù): 【" + data+"】");// 回執(zhí)數(shù)據(jù)byte[] send = ("ok, 這是我第 " + index + " 次收到你的數(shù)據(jù)了。").getBytes(StandardCharsets.UTF_8);packet.setData(send);socket.send(packet);}} catch (Exception e) {e.printStackTrace();} finally {socket.close();}}}

客戶端

package com.luoq.udp;import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import java.nio.charset.StandardCharsets; import java.time.LocalTime;public class UDPClient {public static void main(String[] args) {DatagramSocket socket = null;try {socket = new DatagramSocket(10000);byte[] data = (LocalTime.now() + ", hello, 我在測(cè)試udp! ").getBytes(StandardCharsets.UTF_8);int port = 8080;InetAddress address = InetAddress.getByName("127.0.0.1");DatagramPacket packet = new DatagramPacket(data, data.length, address, port);socket.send(packet);byte[] buffer = new byte[1024];DatagramPacket receiver = new DatagramPacket(buffer, buffer.length);socket.receive(receiver);String res = new String(receiver.getData(), 0, receiver.getLength(), StandardCharsets.UTF_8);System.out.println("客戶端收到服務(wù)端的回執(zhí)數(shù)據(jù): 【" + res + "】");} catch (Exception e) {e.printStackTrace();} finally {socket.close();}} }

總結(jié)

以上是生活随笔為你收集整理的java中udp的使用的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。