UDP transmits and receives data []

package com.yjf.esupplier.common.test;

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

/**
 * @author shusheng
 * @description UDP 发送接收数据
 * @Email [email protected]
 * @date 2019/1/6 0:21
 */
public class SendDemo {

    public static void main(String[] args) throws Exception {
        DatagramSocket socket = new DatagramSocket();
        String str = "i love you";
        //Encapsulating the data packet to the data packets 
        of DatagramPacket Packet = new new of DatagramPacket (str.getBytes (), 
                str.length (), InetAddress.getByName ( "localhost"), 6666 ); 
        socket.send (Packet); // send 

        byte [] = BUFF new new  byte [100 ]; 
        of DatagramPacket packet2 = new new of DatagramPacket (BUFF, 100 ); 
        Socket.Receive (packet2); 
        System.out.println ( new new String (BUFF, 0 , packet2.getLength ())); 
        Socket .close (); 
    } 

}

 

package com.yjf.esupplier.common.test;

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

/**
 * @author shusheng
 * @description UDP 发送接收数据
 * @Email [email protected]
 * @date 2019/1/7 23:24
 */
public class ReceiveDemo {

    public static void main(String[] args) throws Exception {

        // 先接收数据
        DatagramSocket socket = new DatagramSocket(6666);
        byte[] buff = new byte[100];
        DatagramPacket packet = new DatagramPacket(buff, buff.length);
        socket.receive(packet);// 接受传来的数据包
        System.out.println(new String(buff, 0, packet.getLength()));

        // 发送数据
        String str = "me too";
        DatagramPacket packet2 = new DatagramPacket(str.getBytes(),
                str.length(), packet.getAddress(), packet.getPort());
        socket.send(packet2);
        socket.close();
    }

}