datagramserverdemo.java

java核心编程的部分源码

 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);
}
}