UDP发送消息

1.发送端

package shapes;

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

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            // 创建DatagramSocket
            DatagramSocket ds = new DatagramSocket();
            //创建数据并打包
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            String line;
            while((line = br.readLine()) != null) {
                // 输入886取消发送数据
                if(line.equals("886")) {
                    break;
                }
                // 创建数据
                byte[] bys = line.getBytes();
                
                DatagramPacket dp = new DatagramPacket(bys,bys.length,InetAddress.getByName("192.168.90.114"),10086);
                
                // 发送数据
                ds.send(dp);
                
            }
            
            // 关闭发送端
            ds.close();
            
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

2.接收端

package shapes;

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

public class UDPDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            // 创建DatagramSocket
            DatagramSocket ds = new DatagramSocket(10086);
            
            // 创建数据包
            byte[] bys = new byte[1024];
            DatagramPacket dp = new DatagramPacket(bys, bys.length);
            while(true) {
                // 接收数据
                try {
                    ds.receive(dp);
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                
                // 解析数据包
                System.out.println("数据是：" + new String(dp.getData(), 0, dp.getLength()));
            }
            //关闭接收端
            //ds.close();
            
        } catch (SocketException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }

}

3.结果：

 

 

参阅：https://www.bilibili.com/video/BV1vk4y117fU?p=348