本文实例为大家分享了Java网络编程UDP协议发送接收数据的具体代码，供大家参考，具体内容如下
UDP协议发送数据步骤
A：创建发送端socket对象；
B：创建数据，并把数据打包；
C：调用socket对象的发送方法发送数据包；
D：释放资源
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package net; import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress; public class SendDemo { public static void main(String[] args) throws IOException { //A DatagramSocket ds = new DatagramSocket(); //B byte[] by = "Hello,UDP".getBytes(); int length = by.length; InetAddress addr = InetAddress.getByName("192.168.1.22"); int port = 10010; DatagramPacket dp = new DatagramPacket(by, length, addr, port); //C ds.send(dp); //D ds.close(); }} |
UDP协议接收数据步骤
A：创建接收端socket对象；
B：创建一个数据包（接收容器）；
C：调用socket对象的接收方法接收数据；
D：解析数据，显示到控制台；
E：释放资源
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package net; import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress; public class ReceiveDemo { public static void main(String[] args) throws IOException { //A DatagramSocket ds = new DatagramSocket(10010); //B byte[] by = new byte[1024]; int length = by.length; DatagramPacket dp = new DatagramPacket(by, length); //C ds.receive(dp); //D //获取对方ip InetAddress addr = dp.getAddress(); String ip = addr.getHostAddress(); byte[] by2 = dp.getData(); int len = by2.length; String s = new String(by2, 0, len); System.out.println(ip+"发送的数据是："+s); //E ds.close(); }} |
先运行接收端代码，再运行发送端代码。
多次从键盘接收发送数据版本
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package net; import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress; public class SendDemo { public static void main(String[] args) throws IOException { //A DatagramSocket ds = new DatagramSocket(); //数据来自键盘录入 BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String line = null; while((line = br.readLine()) != null){ //当输入jieshu时，结束 if("jieshu".equals(line)){ break; } //B byte[] by = line.getBytes(); int length = by.length; InetAddress addr = InetAddress.getByName("192.168.1.22"); int port = 10010; DatagramPacket dp = new DatagramPacket(by, length, addr, port); //C ds.send(dp); } //D ds.close(); }} |
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package net; import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress; public class ReceiveDemo { public static void main(String[] args) throws IOException { //A DatagramSocket ds = new DatagramSocket(10010); //多次接受版本 while(true){ //B byte[] by = new byte[1024]; int length = by.length; DatagramPacket dp = new DatagramPacket(by, length); //C ds.receive(dp); //D //获取对方ip InetAddress addr = dp.getAddress(); String ip = addr.getHostAddress(); byte[] by2 = dp.getData(); int len = by2.length; String s = new String(by2, 0, len); System.out.println(ip+"发送的数据是："+s); } //E //ds.close(); }} |
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服务器之家。
原文链接：https://blog.csdn.net/weufengwangshi_/article/details/81608682
