Study of Socket Programming and Client – Server mode

AIM:

To implement socket programming date and time display from client to server using TCP Sockets

ALGORITHM:

Server

1. Create a server socket and bind it to port.

2. Listen for new connection and when a connection arrives, accept it.

3. Send server‟s date and time to the client.

4. Read client‟s IP address sent by the client.

5. Display the client details.

6. Repeat steps 2-5 until the server is terminated.

7. Close all streams.

8. Close the server socket.

9. Stop.

Client

1. Create a client socket and connect it to the server‟s port number.

2. Retrieve its own IP address using built-in function.

3. Send its address to the server.

4. Display the date & time sent by the server.

4. Close the input and output streams.

4. Close the client socket.

7. Stop.

PROGRAM:

DateClient.java:

import java.net.*;

import java.io.*;

class dateclient

{

public static void main (String args[])

{

Socket soc;

DataInputStream dis;

String sdate;

PrintStream ps;

try

{

InetAddress ia=InetAddress.getLocalHost();

soc=new Socket(ia,8020);

dis=new DataInputStream(soc.getInputStream());

sdate=dis.readLine();

System.out.println("THE date in the server is:"+sdate);

ps=new PrintStream(soc.getOutputStream());

ps.println(ia);

}

catch(IOException e)

{

System.out.println("THE EXCEPTION is :"+e);

}

}

}

DateServer.java:

import java.net.*;

import java.io.*;

import java.util.*;

class dateserver

{

public static void main(String args[])

{

ServerSocket ss;

Socket s;

PrintStream ps;

DataInputStream dis;

String inet;

try

{

ss=new ServerSocket(8020);

while(true)

{

s=ss.accept();

ps=new PrintStream(s.getOutputStream());

Date d=new Date();

ps.println(d);

dis=new DataInputStream(s.getInputStream());

inet=dis.readLine();

System.out.println("THE CLIENT SYSTEM ADDRESS IS :"+inet);

ps.close();

}

}

catch(IOException e)

{

System.out.println("The exception is :"+e);

}

}

}

OUTPUT:

CLIENTSIDE:

C:\Program Files\Java\jdk1.5.0\bin>javac dateclient.java

Note: dateclient.java uses or overrides a deprecated API.

Note: Recompile with -deprecation for details.

C:\Program Files\Java\jdk1.5.0\bin>java dateclient

THE date in the server is:Sat Mar 19 13:01:16 GMT+05:30 2008

C:\Program Files\Java\jdk1.5.0\bin>

SERVERSIDE:

C:\Program Files\Java\jdk1.5.0\bin>javac dateserver.java

Note: dateserver.java uses or overrides a deprecated API.

Note: Recompile with -deprecation for details.

C:\Program Files\Java\jdk1.5.0\bin>java dateserver

THE CLIENT SYSTEM ADDRESS IS :com17/192.168.21.17