Implement a ping server program using TCP socket

Implement a ping server program using a TCP socket

Server-side

import java.net.*;

import java.io.*;

import java.net.SocketException;

import java.util.*;

import java.lang.*;

class pingtcpserver

{

public static void main(String args[]) throws Exception

{

ServerSockets=null;

Socketsoc=null;

String smsg="";

PrintWriter pw;

try

{

s=new ServerSocket(5219);

System.out.println("Connecting with client ....... ");

soc=s.accept();

System.out.println("Connection Established");

BufferedReader brin=new BufferedReader(new InputStreamReader(soc.getInputStream()));

for(int i=0;i<5;i++)

{

pw=new PrintWriter(soc.getOutputStream(),true);

smsg=brin.readLine();

if(i==3)

Thread.sleep(100);

pw.println(smsg);

}}

catch(SocketException e)

{

System.out.println(e);

}

finally

{

s.close();

soc.close();

}}}

Client-side

import java.io.*;

import java.net.*;

import java.net.SocketException;

import java.util.*;

class pingtcpclient

{

public static void main(String args[]) throws Exception

{

Socketsoc=null; try

{

String str="";

String ip="127.0.0.1";

String cmsg="Ping Testing";

intsendcount=0,recvcount=0,lost=0;

long diff=0,avg=0,min=0,max=0,tottime=0;

soc=new Socket("localhost",5219);

BufferedReader in=new BufferedReader( new InputStreamReader(soc.getInputStream())); PrintWriter

pw=new PrintWriter(soc.getOutputStream(),true);

System.out.println("");

System.out.println("Pinging"+" "+ ip+" "+"with"+" "+cmsg.length()+" "+"bytes of data:");

System.out.println("");

for(int i=0;i<5;i++)

{

Date senddate=new Date();

sendcount=sendcount+1;

pw.println(cmsg);

str=in.readLine();

Date receivedate=new Date();

if (!str.equals(""))

{

recvcount=recvcount+1;

}

lost=recvcount-sendcount;

diff=((receivedate.getTime())-(senddate.getTime()));

if(recvcount==1)

{

min=diff;

}

tottime=tottime+diff;

if(diff<min)

{

min=diff;

}

if(diff>max)

{

max=diff;

}

avg=(tottime/recvcount);

if (diff > 2000)

System.out.println("Timeout");

else

System.out.println("Reply from "+ ip +": "+"bytes=" +str.length() +" "+"time<"+diff+ "ms TTL=128");

}//

for System.out.println("");

System.out.println("Ping statistics for "+ip+":");

System.out.println (" Packets: Sent = "+cmsg.length()+", Received= "+str.length() +", Lost= "+

lost+"("+(lost/sendcount)*100+"%loss),");

System.out.println("Approximate round trip times in milli-seconds:");

System.out.println(" Minimum= "+min+"ms, Maximum= "+max+"ms, Average= "+avg+"ms");

}//try

catch(Exception e)

{

System.out.println(e);

}

finally

{

soc.close();

}}}