UDP网络编程

package com.atguigu.java2;
import org.junit.Test;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
/**
 * @author Dxkstart
 * @create 2021-06-05 18:04
 */
public class UDPTest {
    @Test
    public void send(){//发送端
        DatagramSocket socket = null;
        try {
            socket = new DatagramSocket();
            String str = "我是UDP发送的导弹";
            byte[] data = str.getBytes();
            InetAddress inet = InetAddress.getLocalHost();//本地地址
            DatagramPacket packet = new DatagramPacket(data,0,data.length,inet,9090);
            //发送
            socket.send(packet);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if(socket != null) {
                    socket.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    @Test
    public void receiver() throws IOException {//接收端
        DatagramSocket socket = new DatagramSocket(9090);
        byte[] buffer = new byte[100];
        DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length);
        //接收数据
        socket.receive(packet);
        System.out.println(new String(packet.getData(),0,packet.getLength()));
        socket.close();
    }
}