Programming Assignment 3: UDP Pinger Lab

Programming Assignment 3: UDP Pinger Lab

	import java.io.*;
	import java.net.DatagramPacket;
	import java.net.DatagramSocket;
	import java.net.InetAddress;
	import java.text.SimpleDateFormat;
	import java.util.Date;
	import java.util.Random;
	 
	public class PingClient {
	    private static final double LOSS_RATE = 0.3;
	    private static final int AVERAGE_DELAY = 100;       // milliseconds
	     
	    public static void main（String[] args） throws Exception {
	        // Get command line argument.
	        if （args.length == 0） {
	            System.out.println（“Required arguments: host port“）; 
	            return;
	        }
	         
	        if（args.length == 1） {
	            System.out.println（“Required arguments: port“）;
	            return;
	        }
	         
	        String host = args[0].toString（）;
	        int port = Integer.parseInt（args[1]）;
	         
	        // 发起向服务器的连接        
	        DatagramSocket clientSocket = new DatagramSocket（）;
	        // 等待1秒钟
	        clientSocket.setSoTimeout（1000）;
	 
	        InetAddress IPAddress = InetAddress.getByName（host）;
	         
	        for（int i = 0; i < 10; i++） {
	            // 发送报文
	            byte[] sendData = new byte[1024];
	            byte[] receiveData = new byte[1024];
	            Date currentTime = new Date（）;
	            SimpleDateFormat formatter = new SimpleDateFormat（“yyyy-MM-dd HH:mm:ss“）;
	            String timeStamp = formatter.format（currentTime）;
	            String pingMessage = “PING “ + i + “ “ + timeStamp ;
	            sendData = pingMessage.getBytes（）;
	            DatagramPacket sendPacket = new DatagramPacket（sendData sendData.length IPAddress port）;
	            try{
	                clientSocket.send（sendPacket）;
	                 
	                DatagramPacket receivePacket = new DatagramPacket（receiveData receiveData.length）;
	                clientSocket.receive（receivePacket）;
	                String reply = new String（receivePacket.getData（））;
	                System.out.println（“FROM SERVER: “ + reply）;
	            } catch （java.net.SocketTimeoutException ex） {
	                String reply = “No reply.“;
	                System.out.println（“FROM SERVER: “ + reply）;
	            }
	        }
	        // 关闭与服务器的UDP连接
	        clientSocket.close（）;
	    }
	}

 属性            大小     日期    时间   名称
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     文件        232  2011-12-04 19:23  UDP-Pinger\.classpath

     文件        386  2011-12-04 19:23  UDP-Pinger\.project

     文件       2676  2011-12-07 22:07  UDP-Pinger\bin\PingClient.class

     文件       2610  2011-12-07 21:50  UDP-Pinger\bin\PingServer.class

     文件       2356  2011-12-07 22:07  UDP-Pinger\src\PingClient.java

     文件       3490  2011-12-07 21:50  UDP-Pinger\src\PingServer.java

     目录          0  2011-12-04 19:25  UDP-Pinger\bin

     目录          0  2011-12-04 19:25  UDP-Pinger\src

     目录          0  2011-12-04 19:23  UDP-Pinger

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