Java——模拟Ping.doc

这个实验目标是模拟Ping的传输过程。没有实现Ping协议部分，只是利用简单的UDP Socket编程。先启动Server端再启动Client。Server代码：/这个程序需要跟UDPClient一起启动和使用，此程序通过UDP传输模拟简单的Ping功能的实现import java.io.*;import .*;public class UDPServer public static void main(String args) throws Exception DatagramSocket serverSocket = new DatagramSocket(8050);/监听8050端口byte receiveData = new byte1024;/用于存储接收到的数据byte sendData =new byte1024;/用于存储将要发送的数据System.out.println(The UDPServer start now.);while(true) DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);serverSocket.receive(receivePacket);/接受来自客户端的请求String receiveSentence = new String(receivePacket.getData();InetAddress IPAdress = receivePacket.getAddress();int port = receivePacket.getPort();sendData = (Ping successful!).getBytes();/将字符串转换为字节流DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAdress, port);serverSocket.send(sendPacket);/返回“Ping成功”报文Client代码：/这个程序需要跟UDPServer一起启动和使用，此程序通过UDP传输模拟简单的Ping功能的实现import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.*;import .*;import java.util.*;import javax.swing.Timer;public class UDPClient public static void main(String args) throws Exception DatagramSocket clientSocket = new DatagramSocket();byte sendData = new byte1024;byte receiveData = new byte1024;Scanner input = new Scanner(System.in);int IP = new int4 ;System.out.print(Please input the Ping IP(fomat like 115 24 250 196): );for(int i = 0; i 4; i+)/从控制台接收要Ping的主机的IP地址IPi = input.nextInt();byte test = new byte (byte)IP0, (byte)IP1, (byte)IP2, (byte)IP3 ;/将接用户输入的4个证书转换为字节流System.out.println(n + Trying to Ping IP + IP0 + . + IP1 + . + IP2 + . + IP3 + now);System.out.println(Send messenges: Ping successful?);InetAddress IPAdress = InetAddress.getByAddress(test);sendData = (Ping successful?).getBytes();DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAdress, 8050);/发送UDP数据包Timer timer = new Timer(10000, new Timeout();timer.start();/启动计时器，超时则认为不能Ping通clientSocket.send(sendPacket);Date date1 = new Date(); long ms1 = date1.getTime(); /发送数据包的时间DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);clientSocket.receive(receivePacket);String receiveStr = new String(receivePacket.getData();Date date2 = new Date(); long ms2 = date2.getTime();/接收返回数据包的时间 long ms3 = ms2 - ms1;/两个时间相减得到往返时间System.out.println(n + FROM SERVER: + receiveStr.trim();System.out.println( The RTT: + ms3 + ms);clientSocket.close();class Timeout implements ActionListener publi