Java核心代码例程之：DatagramServerDemo.java

2019-11-18 15:14:54

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import java.io.*;
import java.net.*;

/**
* Demonstrates how to write Datagram server
*
* @see DatagramClientDemo
***/
public class DatagramServerDemo
{
    public static void main(String args[]) throws Exception
    {
        byte Data[] = new byte[20];

        // Client on port 4444, Server on 5555
        DatagramSocket socket = new DatagramSocket(5555);
        DatagramPacket packet = new DatagramPacket(Data, 20);

        socket.receive(packet);
        String received = new String(packet.getData(), 0);
        System.out.PRintln(received);

        String sendMsg="Hello Back";
        sendMsg.getBytes(0, sendMsg.length(), Data, 0);
        packet  = new DatagramPacket(Data, 20,
                                packet.getAddress(),
                                packet.getPort());
        socket.send(packet);
    }
}

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