Java Socket例程3 UDP

UdpSend.java

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

 public class UdpSend {
     public static void main(String args[]){
         DatagramSocket ds = null;
         DatagramPacket dp = null;
         try{
             ds = new DatagramSocket(3000); //实例化一个UDP的套接字并绑定3000绑定         
　　　　　　　}catch(SocketException e){
            }
         String str = "hello world";
         try{
             dp = new DatagramPacket(str.getBytes(),str.length(),InetAddress.getByName("localhost"),9000);
　　         }
         catch(UnknownHostException ex1){
                      }
         try{
             ds.send(dp);   //发送数据到本机的9000
             }catch(IOException e){
                      }
         ds.close();
     }
 }