timeclient.java

《Java实例入门》所有实例的源代码。所有的源文件都是.java文件

import java.net.*;
import java.util.*;
import java.io.*;
public class timeClient {
   public static void main(String[] args) {
      String         host;
      InetAddress    hostAddress;
      byte[]         outBuffer = new byte[1];
      byte[]         inBuffer = new byte[512];
      DatagramPacket request;
      DatagramPacket reply;
      DatagramSocket timeSocket;
      if (args.length <1) {
        System.out.println("Usage: Daytime [服务器]");
      }
      else{
          try{
              host = args[0];
              hostAddress = InetAddress.getByName(host);
             System.out.println("getting " + hostAddress.toString() + " time ");
             timeSocket = new DatagramSocket();
              // 创建请求和应答缓冲区
              request = new DatagramPacket(outBuffer, outBuffer.length, hostAddress, 13);
             reply = new DatagramPacket(inBuffer, inBuffer.length);
             // 发送请求并读取应答
             try {
                 timeSocket.setSoTimeout(5 * 1000);
                 timeSocket.send(request);
                 timeSocket.receive(reply);
                 System.out.print("the answer is : " +new String(inBuffer, 0, reply.getLength()));
             } finally {
               timeSocket.close();
             }
        } catch(Exception ex) {
              System.out.println(ex);
         }
      }
      System.exit(0);
   }
}