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Servlets

URL rewriting ?

Bharatesh H Kakamari

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posted 23 years ago

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What is URL rewriting ?

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Posts: 202

posted 23 years ago

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Hi
We track sessions 2 ways.
1. Cookies
2. URL Rewriting.
URL Rewriting is a method used to track sessions when the browser being used by the client does not support cookies.In this process, all links and redirections during the client session must be encoded to include session ID as part of the URL.
Hope this helps
Regards
Suneel
[This message has been edited by Suneel Setlur (edited January 27, 2001).]

Suneel

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posted 23 years ago

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Suneel Setlur,
Could you give some sort of example of URL rewriting?

SCJP
Visit my download page

Bharatesh H Kakamari

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posted 23 years ago

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Please do provide examples. It will be more clear
Thanks

Greenhorn

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posted 23 years ago

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Check out this site. http://www.jguru.com/jguru/faq/view.jsp?EID=1045
There is a clear explanation and a simple example.
Hope this helps!!
Happy Coding!!

Suneel Setlur

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posted 23 years ago

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Hi Randall,Bharatesh
Hari has given you an example which demostrates URL rewriting.
Note that you cannot use URL Rewriting with static HTML pages as the URL must be encoded for each user to include the session Id.
The way in which it is encoded is server specific, but will be like added information or parameters.

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class  urlsession extends HttpServlet {
static final String COUNTER_KEY="CounterRewrite.count";
public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

PrintWriter out=response.getWriter();;
HttpSession session=request.getSession(true);
int count=1;
Integer i=(Integer)session.getValue(COUNTER_KEY);
if(i!=null) {
count=i.intValue()+1;
}

//putting the count back into session
session.putValue(COUNTER_KEY,new Integer(count));
out.println("<html><body>");
out.println("<h2>URL ReWriting</h2>");
out.println("Your Session Id is <b>"+session.getId()+"</b><br>");
out.println("You have hit this page <b>"+count +"  </b>times during this browser session<br>");
   //your URL
String url=request.getRequestURI();
out.println("<form method=post action=\""+response.encodeURL(url)+"\">");
out.println("<br><input type=submit name=submit value=Hit>");
out.println("</form>");
out.println("</body></html>");
out.flush();

}
}

Regards
Suneel

Suneel

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Posts: 5

posted 23 years ago

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Hi Sunnel
We track sessions in 4 ways.

1. Cookies
2. URL Rewriting.
3.Client Authentication.
4.Hidden form Fields.
Depending on the requirment,keeping in mind the security part the required one is selected.
e.g...
When u r working on a B2B portal u need to know the clients list and also vendor's list.Different screen's for different login.which can bo done by Client Authenticationi.e...by his ID & password.

Originally posted by Suneel Setlur:
Hi
We track sessions 2 ways.
1. Cookies
2. URL Rewriting.
URL Rewriting is a method used to track sessions when the browser being used by the client does not support cookies.In this process, all links and redirections during the client session must be encoded to include session ID as part of the URL.
Hope this helps
Regards
Suneel
[This message has been edited by Suneel Setlur (edited January 27, 2001).]

Hari Haran

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Posts: 19

posted 23 years ago

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Hi Guys,
We have to code JSP pages which will work even if cookies is disabled.I am using EncodeUrl and it is working.

Eg:
===
String EncodeUrlModify = response.encodeUrl("modify.jsp?MenuOption=2&SubMenuOption=4");
document.frm.action="<%=EncodeUrlModify%>";
<a href="<%=EncodeUrlModify%>">

But,In the places where I use sendredirect, I used
response.encodeRedirectURL()
But it doesn't seem to work properly.
Please help me out.
Regards,
Hari

Suneel Setlur

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Posts: 202

posted 23 years ago

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Hi Vani

Originally posted by vani:
Hi Sunnel
We track sessions in 4 ways.

1. Cookies
2. URL Rewriting.
3.Client Authentication.
4.Hidden form Fields.
Depending on the requirment,keeping in mind the security part the required one is selected.
e.g...
When u r working on a B2B portal u need to know the clients list and also vendor's list.Different screen's for different login.which can bo done by Client Authenticationi.e...by his ID & password.

Clients are identified using session Ids. To maintain(persist) unique identities we use cookies or URL rewriting.
Please elaborate on session tracking thru hidden fields.
-----------------------------------------------------------
Hari
Import java.net.* and try using URlEncoder.encode(String).
Please get back after trying.
Regards
Suneel

[This message has been edited by Suneel Setlur (edited January 29, 2001).]

Suneel

Bharatesh H Kakamari

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Posts: 198

posted 23 years ago

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Thanks all. Thanks also for a very good example urlsession.java for getting the basic understanding of url rewriting.
I have modified urlsession.java slightly for better understanding:

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class urlsession extends HttpServlet 
{

public void doGet(HttpServletRequest request,HttpServletResponse response) 
throws ServletException, IOException 
{

PrintWriter out=response.getWriter();
HttpSession session=request.getSession(true);

if(session.isNew())
    {
        session.putValue("COUNTER_KEY", new int[] { 0 });
    }
      
   int[] count = (int[])session.getValue("COUNTER_KEY");

count[0]++;

//putting the count back into session
out.println("<html><body>");
out.println("<h2>URL ReWriting</h2>");
out.println("Your Session Id is <b>"+session.getId()+"</b><br>");
out.println("You have hit this page <b>"+count[0] +"  </b>times during this browser session<br>");
//your URL
String url=request.getRequestURI();
out.println("<form method=post action=\""+response.encodeURL(url)+"\">");
out.println("<br><input type=submit name=submit value=Hit>");
out.println("</form>");
out.println("</body></html>");
out.flush();
}
}

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