1.UPD服务端

定义数据Socket和注册外放的端口

一直做true循环读取数据包Packet里的数据 datagramPacket.getData()转换为String字符串读取

package com.frame.base.UDP;

import java.net.DatagramPacket;
import java.net.DatagramSocket;

/**
 * @author Administrator
 * UDP_Sorcket服务端接收UDP_Socket客户端数据
 */
public class UDPSocketServer {

	public static void main(String[] args) throws Exception {
		/**
		 * 服务端注册9999端口接收和发送数据由此端口转发
		 */
		DatagramSocket datagramSocket = new DatagramSocket(9999);
		while (true) {
			byte[] bytes = new byte[1024];
			/**
			 * 定义数据包对象 获取客户端请求9999端口的数据
			 */
			DatagramPacket datagramPacket = new DatagramPacket(bytes, bytes.length);
			datagramSocket.receive(datagramPacket);
			/**
			 * 获取的数据为
			 */
			String receiveData = new String(datagramPacket.getData(), 0, datagramPacket.getLength());
			System.out.println(datagramPacket.getAddress().getHostAddress() +"_说:"+ receiveData);
		}
	}
}

2.UDP_Socket客户端

定义数据Socket和交互的端口

封装数据Packet和服务端ip和接入端口 发送数据字节关闭

package com.frame.base.UDP;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDPSocketClient {

	public static void main(String[] args) throws Exception {
		/**
		 * 定义客户单发送报文的端口
		 */
		DatagramSocket datagramSocket = new DatagramSocket(8080);
		/**
		 * 读取控制台信息
		 */
		BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
		String lineStr = null;
		while ((lineStr = bufferedReader.readLine()) != null) {
			byte[] bytes = lineStr.getBytes("UTF-8");
			/**
			 * 封装数据发送到服务端ip和端口
			 */
			DatagramPacket datagramPacket = new DatagramPacket(bytes, bytes.length,InetAddress.getByName("127.0.0.1"), 9999);
			datagramSocket.send(datagramPacket);
		}
		datagramSocket.close();
	}
}

3.运行

1.启动UDPSocketServer服务端main方法

2.启动UDPSocketClient服务端main方法

3.在客户端控制台发送信息给服务端