udpclient.java

精通Java核心技术源代码

// ==================== Program Discription ===================
// 程序名称：示例12-11: UDPClient.java
// 程序目的：创建UDP客户端
//=============================================================
import java.net.*;
import java.io.*;

public class UDPClient
{
   public static void main(String  args[])
   {
	  try {
	   	DatagramSocket sendSocket=new DatagramSocket(3456);
		String string="asfdfdfggf";
		byte[] databyte=new byte[100];
		databyte=string.getBytes();
	    	DatagramPacket sendPacket=new DatagramPacket(databyte,string.length(), 
                                 InetAddress.getByName("163.121.139.20"), 5000);                                                                                                                 
      	sendSocket.send(sendPacket);
         System.out.println("send the data: hello ! this is the client");
      }
      catch (SocketException e) {
		System.out.println("不能打开数据报Socket，或数据报Socket无法与指定的端口连接!");
	 }
      catch(IOException ioe) {
         System.out.println("网络通讯出现错误，问题在"+ioe.toString());
	 }   
   }
}