UDP通信

服务端：

package s;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class Server {
		
	public static void main(String[] args) throws Exception {
		
		DatagramSocket socket = new DatagramSocket(4187);
		System.out.println("启动服务器......");
		byte[] buff = new byte[1024];
		DatagramPacket pack = new DatagramPacket(buff, buff.length);
		socket.receive(pack);
		System.out.println(new String(pack.getData()));
		
		
	}
}

 客户端：

package c;

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


public class Client {
	public static void main(String[] args) throws Exception {
		DatagramSocket data = new DatagramSocket(4187);
		System.out.println("客户端启动......");
		InetAddress inet = InetAddress.getByName("127.0.0.1");
		String str = "hello";
		byte[] buff = str.getBytes();
		DatagramPacket packet = new DatagramPacket(buff, buff.length, inet, 4187);
		data.send(packet);
		
	}
}