PHP Session Verification in Each Page

After the user succeed the login we redirect it into the success.php. if any one directly type this url mean we should ask login to see this page, for this purpose we shoul verify the session in each privilaged page with the any php file, in future if modify the session name or value mean that file will help our work simple.


sample code:
//valid.php
<?php
session_start();
if(isset($_SESSION['admin']))
echo "";//echo "Welcome ".$_SESSION['admin'];
else
header("location:index.php");
if($_SESSION['admin']=="out")
header("location:index.php");
?>

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PHP Configuration File Coding

We should save the Database configuration details in a single file (ex: config.php). After that we can include it in All our necessary PHP scripts. In case we shift the server or need to modify any credentials mean we can update that detail in a single file else we need modify all the pages where we use the server connection.


Sample Code for Database Configuration:


//config.php

<?php
$con = mysql_connect("localhost","username","password");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }


mysql_select_db("DB_Name", $con);


?>
____________________________________________


//login.php


<?php
include("config.php");
?>

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TWO WAY COMMUNICATION USING TCP

Step 1 : Open 2 editors and write the coding separately for client and server.

Step2 : Include the  necessary   packages.

Step  3 : Create a new server socket in server side and storing the inputstream  in the buffered    

                   Reader.

Server Socket  ss = new  Server Socket(98);

Socket  s=  ss. Accept ();

BufferedReader  d = new BufferedReader(new  InputStreamReader (SyStepm.in));

Step  4 :  Print  the output stream  by using   print  writer.

PrintWriter  out=  new  PrintWriter(s.getOutputStream(),true);

Step 5 : Read the input and print the string  from the client until the string gets exit.

While(!(inp.equals(“exit”)))

{

String l= sin.readLine();

Out.println(l);

String inp=d.readLine();

}

Step 6 : Create a new socket in the client side.

Socket c= new Socket(InetAddress.getLocalhost(),98);

Step 7 : Print the outputstream and stored in buffered reader.

PrintWriter out=new Printwriter(c.getoutpustream(),true);

BufferedReader in=new BufferedReader(new InputStreamReader(c.getInputStream()));

Step 8 : Save the program separately with the   java extensions.

Step 9 : Compile and execute the program.

 PROGRAM

SERVER

import java.io.*;

import java.net.*;

import java.lang.*;

class tcpc1

{

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

{

try

{

Socket ctsoc=new Socket("localhost",8000);

while(true)

{

BufferedReader in=new BufferedReader(new InputStreamReader(ctsoc.getInputStream()));

String str1=in.readLine();

SyStepm.out.println("Server:"+str1);

if(str1.equals("exit"))

{

ctsoc.close();

}

else

SyStepm.out.println("Client");

BufferedReader stdin=new BufferedReader(new InputStreamReader(SyStepm.in));

PrintWriter out=new PrintWriter(ctsoc.getOutputStream(),true);

String userinput=stdin.readLine();

out.println(userinput);

if(userinput.equals("exit"))

{

ctsoc.close();

}}}

catch(IOException se)

{

SyStepm.out.println("server disconnected...");

}}}

CLIENT

import java.io.*;

import java.net.*;

import java.lang.*;

class tcps1

{

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

{

ServerSocket srsoc=new ServerSocket(8000);

Socket clientsoc=srsoc.accept();

while(true)

{

try{

SyStepm.out.println("Start:");

String ipln;

BufferedReader stdin=new BufferedReader(new InputStreamReader(SyStepm.in));

ipln=stdin.readLine();

PrintWriter out=new PrintWriter(clientsoc.getOutputStream(),true);

out.println(ipln);

if(ipln.equals("exit"))

{

clientsoc.close();

srsoc.close();

break;

}

BufferedReader in=new BufferedReader(new InputStreamReader(clientsoc.getInputStream()));

String str1=in.readLine();

if(str1.equals("exit"))

{

SyStepm.out.println("Client disconnected...");

clientsoc=srsoc.accept();

}else

{

SyStepm.out.println("Client:"+str1);

}}catch(IOException se)

{

SyStepm.out.println("Client not found...");

clientsoc=srsoc.accept();        

}}}}

OUTPUT

Server

C:\Users\User>cd C:\j2sdk1.4.2_08\bin

C:\j2sdk1.4.2_08\bin>javac tcps1.java

C:\j2sdk1.4.2_08\bin>java tcps1

Start:welcome to india

Client:thank you

Start:hello how are you

Client:fine thanks

Start:

Client

C:\Users\User>cd C:\j2sdk1.4.2_08\bin

C:\j2sdk1.4.2_08\bin>javac tcpc1.java

C:\j2sdk1.4.2_08\bin>java tcpc1

Server: welcome to india

Client: thank you

Server: hello how is you

Client: fine thanks

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Send Message from Server to Client using TCP in Java

SERVER

import java.net.*;

import java.io.*;

public class myserv{

public static void main(String s[]) throws IOException

{

ServerSocket s1=new ServerSocket(98);

Socket c=s1.accept();

System.out.println("Connection"+c);

PrintWriter out=new PrintWriter(c.getOutputStream(),true);

BufferedReader in=new BufferedReader(new InputStreamReader(c.getInputStream()));

BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));

System.out.print("Send Message to Client :");

String l;

while((l=sin.readLine())!=null)

{

out.println(l);

System.out.print(" message :");

}

out.close();

sin.close();

c.close();

s1.close();

}}

CLIENT

import java.net.*;

import java.io.*;

public class myclient{

public static void main(String str[]) throws IOException

{

Socket s=new Socket(InetAddress.getLocalHost(),98);

BufferedReader b=new BufferedReader(new InputStreamReader(s.getInputStream()));

String inp;

System.out.println("Ready to receiver");

while((inp=b.readLine())!=null)

{

System.out.println("Input from server : "+inp);

}

b.close();

s.close();

}}

OUTPUT

Server

Microsoft Windows XP [Version 5.1.2600]

(C) Copyright 1985-2001 Microsoft Corp.

C:\>cd C:\Program Files\Java\jdk1.6.0_11\bin

C:\Program Files\Java\jdk1.6.0_11\bin>javac myserv.java

C:\Program Files\Java\jdk1.6.0_11\bin>java myserv

ConnectionSocket[addr=/169.254.146.151,port=2873,localport=98]

Send Message to Client : god loves you

 message :have a nice day

 message :

Client

Microsoft Windows XP [Version 5.1.2600]

(C) Copyright 1985-2001 Microsoft Corp.

C:\>cd C:\Program Files\Java\jdk1.6.0_11\bin

C:\Program Files\Java\jdk1.6.0_11\bin>javac myclient.java

C:\Program Files\Java\jdk1.6.0_11\bin>java myclient

Ready to receive

Input from server :  god loves you

Input from server : have a nice day

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FInd the Factorial Number between Server and Client

SERVER

import java.net.*;

import java.io.*;

public class myserv{

public static void main(String ar[]){

try{

            DatagramSocket s =  new DatagramSocket(1234);

            while ( true ) {

            DatagramPacket packet = new DatagramPacket(new byte[1024], 1024);

            s.receive( packet );

            String message = new String(packet.getData(), 0, 0, packet.getLength());

int res=1;

int ms=Integer.parseInt(message);

for(int i=1;i<=ms;i++) res=res*i;

String str1=res+" ";

  System.out.println( "Factorial of " + 

              message + " is " + str1);       }   }

catch(Exception e){}    }}

CLIENT

import java.net.*;

import java.io.*;

public class myclient{     

 public static void main(String ar[]) {

  int myPort = 1234;

try {

  DatagramSocket ds = new DatagramSocket();

  DatagramPacket pack;

  InetAddress addr = InetAddress.getLocalHost();

  BufferedReader b=new BufferedReader (new InputStreamReader(System.in));  

       {

         System.out.print("Enter the number to find factorial : ");

         String message=b.readLine();   

         byte [] data = new byte [ message.length() ];

         message.getBytes(0, data.length, data, 0);   

         pack =  new DatagramPacket(data, data.length, addr, myPort);

        ds.send( pack );

  }  }

        catch ( IOException e )  { 

        System.out.println( e );

    }  }}

OUTPUT

Client

C:\Program Files\Java\jdk1.6.0_11\bin>java client1

Enter the number  : 4

C:\Program Files\Java\jdk1.6.0_11\bin>java client1

Enter the number to find factorial : 6

Server:

C:\Program Files\Java\jdk1.6.0_11\bin>java serv

Factorial of 4 is 24

Factorial of 6 is 720

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