UDP网络编程

UDP网络编程

1.概述

2.DatagramSocket类的常用方法


3.UDP网络通信

package com.atguigu.java1;

import org.junit.Test;

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

/**
 * UDPd协议的网络编程
 * @author shkstart
 * @create 2019 下午 4:34
 */
public class UDPTest {

    //发送端
    @Test
    public void sender() throws IOException {

        DatagramSocket socket = new DatagramSocket();



        String str = "我是UDP方式发送的导弹";
        byte[] data = str.getBytes();
        InetAddress inet = InetAddress.getLocalHost();
        DatagramPacket packet = new DatagramPacket(data,0,data.length,inet,9090);

        socket.send(packet);

        socket.close();

    }
    //接收端
    @Test
    public void receiver() throws IOException {

        DatagramSocket socket = new DatagramSocket(9090);

        byte[] buffer = new byte[100];
        DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length);

        socket.receive(packet);

        System.out.println(new String(packet.getData(),0,packet.getLength()));

        socket.close();
    }
}