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Web Component Certification (OCEJWCD)

Url Rewriting

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posted 15 years ago

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I wanted how sessions are maintaines through url rewriting and not throught Cookies.
I wrote this program to find out about session in cookies..
But I am not sure how to use the same program for urlrewriting..

My SessionServlet.java

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class MySessionServlet extends HttpServlet

{

public void doGet(HttpServletRequest request, HttpServletResponse

response) throws IOException, ServletException
{

response.setContentType("text/html");
PrintWriter out=response.getWriter();

String name= request.getParameter("username");
String age= request.getParameter("age");
out.println("Name : " + name);
out.println(" ");
out.println("Age : " + age);

out.println("I am living in a session.. i mean a sessionServlet :)");
out.println(" ");

HttpSession session=request.getSession();
out.println(" ");

out.println("This is session object: " + session);
out.println(" ");

if(session.isNew())

{out.println("NEW SESSION");}
else
{out.println("OLD SESSION");}

out.println("is session new?? " + session.isNew());
out.println(" ");

session.setAttribute("foo","429");
session.setAttribute("bar","420");

out.println("I am setting the interval time");
session.setMaxInactiveInterval(15);

String foo= (String) session.getAttribute("foo");
String bar= (String) session.getAttribute("bar");

out.println(foo);
out.println(bar);

out.println("This is session object: " + session);
out.println(" ");
out.println("is session New" + session.isNew());
out.println(" ");

out.println(foo);
out.println(bar);

}

and the form.jsp is

And my web.xml is:

Now I am sure where to fit the url rewriting ..which is mentioned in HFSJ as ...

out.println("click me");
This line gives a hyperlink.
When we click on click me it goes to /sissy.do.

Now if i change my form.html to <form method="get" action="MyUrlRewritingServlet.do">
The parmeters of the form will not be passed.

So i am not sure how to make this work and see the results of UrlRewriting...

Can someone please help with the code...

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Chinmaya Chowdary

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posted 15 years ago

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Hi, Nabila.

Use in 'MyUrlRewritingServlet' class and,

Modify web.xml little,
Inorder to see wether url rewriting is working or not, disable cookies in browser.

SCJP5.0, SCWCD5.0, OCEJPAD6, OCPJWSD6

Nabila Mohammad

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posted 15 years ago

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Thanks Chinmaya...

but still cant get the code to work..

I am getting the error
The requested resource (/sissy2.do) is not available.

I suppose there is some problem with :

As it cant get access to sissy2.do.

Is it something to do with the path ...?

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Chinmaya Chowdary

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posted 15 years ago

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Hi, Nabila.

We should use relative path,
If we say, response.encodeURL("/sissy2.do"); it will go to the server root.

SCJP5.0, SCWCD5.0, OCEJPAD6, OCPJWSD6

Nabila Mohammad

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posted 15 years ago

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Thanks !

That worked..
But the parameters ie. Name and Age is not passd on to "sissy2" file.I get a null value .
Is there any way i can pass it on to sissy2 from sissy?

I cannot understand the significance of using a hyperlink for Url encoding ie.
Isnt there any way to do url encoding with out clicking on "click me" or with out using a hyperlink,

I am trying to run this code.. to display the name and value of all cookies that is existing with in a request.
I know there is atleast one ie. JSESSION ID. Since I am using UrlRewriting.
But i keep getting a Null Pointer Exception.
Can some one help me here...

Thanks!

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posted 15 years ago

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Hi, Nabila.

But the parameters ie. Name and Age is not passd on to "sissy2" file.I get a null value .
Is there any way i can pass it on to sissy2 from sissy?

Get the form parameters in 'MyUrlRewritingServlet' class and store them in 'session' scope. Get these 'session' attributes in 'MySessionServlet' class.

I cannot understand the significance of using a hyperlink for Url encoding ie.
Isnt there any way to do url encoding with out clicking on "click me" or with out using a hyperlink,

For this use, in 'MyUrlRewritingServlet' class.

I am trying to run this code.. to display the name and value of all cookies that is existing with in a request.
I know there is atleast one ie. JSESSION ID. Since I am using UrlRewriting.
But i keep getting a Null Pointer Exception.

Since we disable cookies in browser to test wether url rewriting is working or not, we don't get cookies at the container. If we use url rewriting container use, name of the session id as 'jsessionid' and follwed by its value. As far I know here 'jsessionid' is not a cookie.

SCJP5.0, SCWCD5.0, OCEJPAD6, OCPJWSD6

Nabila Mohammad

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posted 15 years ago

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I am not sure how to store parameters in session scope.
If you could you help me with it..i woud really appreciate it!

Thanks for your answers.They were really helpful.
The cookies not being displayed made sense.. since cookies were disabled

But there is one thing....
When i run the same code with cookies enabled and without url rewriting( i didnot use the MyUrlRewritingServlet file at all) , I get the output :

My cookie name is JSESSIONID and value is 79ECABE90D7E5F2CDAF48D3F07061F9B
(The only cookie that exists )

Wouldn't that mean JSESSIONID is a cookie?

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Chinmaya Chowdary

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posted 15 years ago

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Hi, Nabila.

I am not sure how to store parameters in session scope.

Get the form parameters and set them in session scope like,

Add it in 'MyUrlRewritingServlet' class.

And get the session scope attributes in 'MySessionServlet' class like

When i run the same code with cookies enabled and without url rewriting( i didnot use the MyUrlRewritingServlet file at all) , I get the output :

My cookie name is JSESSIONID and value is 79ECABE90D7E5F2CDAF48D3F07061F9B
(The only cookie that exists )

Wouldn't that mean JSESSIONID is a cookie?

Yes, it is 'JSESSIONID' cookie. I think 'form.jsp' sets that cookie.

SCJP5.0, SCWCD5.0, OCEJPAD6, OCPJWSD6

Lucas Smith

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