clientservice.java

用java写的用于C/S服务的网络应用程序

package udptestclient;

import java.io.*;
import java.net.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class ClientService {
  public ClientService() {
  }
  public static void main(String[] args) {
    DatagramSocket UDPClientSocket;
                DatagramPacket ClientPacket;
                InetAddress RemoteHost;
                int RemotePort;
                byte dataBuf[]=new byte[512];
                String Datagram,s;
                if(args.length<3)
                {
                        System.out.println("请输入本地端口号，远程服务器主机名，服务器端口号 ！");
                        System.exit(0);
                }
                try{
                        UDPClientSocket = new DatagramSocket(
                                Integer.parseInt(args[0]));
                        RemoteHost = InetAddress.getByName(args[1]);
                        RemotePort = Integer.parseInt(args[2]);
                        Datagram = new String("This mail is from " +
                                InetAddress.getLocalHost().getHostName()
                                +" , give me a receipt \n if you can receive it, Thank you! ");
                        Datagram.getBytes(0, Datagram.length(),dataBuf,0);
                        ClientPacket=new DatagramPacket(dataBuf,512,RemoteHost,RemotePort);
                        UDPClientSocket.send(ClientPacket);
                        for(int i=0;i<512;i++) dataBuf[i]=0;
                        UDPClientSocket.receive(ClientPacket);
                        Datagram=new String(ClientPacket.getData());
                        System.out.println("从远程服务器主机 "+args[1]+" 收到如下应答信息：\n");
                        System.out.println(Datagram);
                        UDPClientSocket.close();
                }
                catch(Exception e)
                {
                        System.err.println(e);
                }

  }

}