import java.awt.event.*;
import java.net.*;
import javax.swing.*;
//Download by http://www.codefans.net
public class UDPClientDemo extends JFrame{
String host="localhost"; //服务器地址
int port=2345; //端口号
public UDPClientDemo(){
try{
DatagramSocket socket=new DatagramSocket(); //实例化一个数据报Socket
InetAddress address=InetAddress.getByName(host); //服务器地址
byte[] buffer=new byte[256]; //缓冲区
DatagramPacket packet=new DatagramPacket(buffer,buffer.length,address,port); //实例化一个数据报
socket.send(packet); //发送报文
packet=new DatagramPacket(buffer,buffer.length);
socket.receive(packet); //接受回应
String message=new String(packet.getData()); //得到报文信息
System.out.println("Received from: "+packet.getAddress()); //显示信息源地址
System.out.println(message); //显示服务器返回信息
socket.close(); //关闭端口
}
catch (Exception ex){
ex.printStackTrace(); //输出出错信息
}
}
public static void main(String[] args){
new UDPClientDemo();
}
}
