2014.11.25UDP聊天程序-优快云博客

本文详细介绍了使用Java实现UDP协议的发送和接收过程，包括创建数据报套接字、发送消息和接收消息的基本步骤。

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1.信息发送

<span style="font-size:18px;">package com.hechao;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
/**
 * UDP信息发送
 * @author 何超
 *
 */
public class MessageSender {
	public static void main(String[] args) {
		DatagramSocket socket = null;	//创建数据报套接字
		try {
			socket = new DatagramSocket();
			byte[] buffer = ("何超,你好！").getBytes("GBK");	//消息内容转换为字节数组
			DatagramPacket p = new DatagramPacket(buffer, buffer.length, 
					InetAddress.getByName("192.168.1.115"), 1234);	//创建数据发送数据报包
			socket.send(p);	//发送数据报包
		} 
		catch (IOException e) {
			e.printStackTrace();
		}
		finally{
			if(socket != null){
				socket.close();	//关闭数据报套接字
			}
		}
	}
}
</span>

2.信息接收

<span style="font-size:18px;">package com.hechao;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
/**
 * UDP接收消息
 * @author 何超
 *
 */
public class MessageReceiver {
	public static void main(String[] args) {
		DatagramSocket socket = null;
		try {
			socket = new DatagramSocket(1234);
			byte[] buffer = new byte[256];
			DatagramPacket p = new DatagramPacket(buffer, buffer.length);
			while (true) {
				socket.receive(p);
				byte[] data = new byte[p.getLength()];
				System.arraycopy(p.getData(), 0, data, 0, data.length);
				System.out.println(new String(data, "GBK"));
			}
			
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if(socket != null){
				socket.close();
			}
		}
	}
}
</span>