创建UDP客户端

/*来自 NowJava.com*/

import java.io.*;

import java.net.*;


class UDPClient {

   public static void main(String args[]) throws Exception {

      

      BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));

      DatagramSocket clientSocket = new DatagramSocket();

      InetAddress IPAddress = InetAddress.getByName("localhost");

      byte[] sendData = new byte[1024];

      byte[] receiveData = new byte[1024];


      String sentence = inFromUser.readLine();

      sendData = sentence.getBytes();

      DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, 9876);


      clientSocket.send(sendPacket);/*来 自 n o w j a   v  a . c o m - 时  代  Java*/

      DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);


      clientSocket.receive(rec