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Web Component Certification (OCEJWCD)

Cookie

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posted 14 years ago

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Hi!

I am trying to run this program of cookies mentioned in HFSJ and I am not sure how it is supposed to run (programatically).
Tried running it from the way i understood , but i am getting "Resourse not found error".
I think some file is incomplete or something is missing..

Anyway these are my codes.

CookieTest.java

CheckCookie.java

This are the additional files i wrote starting with web.xml (may or maynot be incomplete)

My form.html

My cookieresult.jsp (the view)

Can some one please help me in running this program and how the servlets are being called....

Thanks!

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Shailesh Narkhede

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posted 14 years ago

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Please provide directory structure for this web app.

Thanks,
Shailesh

Hasnain Javed Khan

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posted 14 years ago

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Hi Nabila.

but i am getting "Resourse not found error".

When do you get the above error ? when accessing /cooky.do, form.html or cookieresult.jsp ?

Kind Regards.
Hasnain.

Chinmaya Chowdary

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posted 14 years ago

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Hi Nabila.

Inorder to see the affect, modify cookieresult.jsp like this

and add following entries for web.xml

SCJP5.0, SCWCD5.0, OCEJPAD6, OCPJWSD6

Nabila Mohammad

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posted 14 years ago

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Thanks...
That worked...

I didn't know , after the view another servlet would be invoked on clicking...
Always thought the view would be always the last thing...

One more thing...
Where is the out put of CookieTest..java displayed

ie.
out.println(name);
out.println("In Cookie Test");

I dont see anything in the stout file in my log....

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Chinmaya Chowdary

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posted 14 years ago

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Hi Nabila.

Where is the out put of CookieTest..java displayed

ie.
out.println(name);
out.println("In Cookie Test");

I dont see anything in the stout file in my log....

In CookieTest.java, there is forward(request,response) method of RequestDispatcher. We know before forwarding, if any data(here 'name', 'In Cookie Test') present in buffer, that will be cleared. For more information see RequestDispatcher's forward method.

SCJP5.0, SCWCD5.0, OCEJPAD6, OCPJWSD6

Nabila Mohammad

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I read the documentation but i still didn't get it.

Wouldn't the out put be printed at all.. , Or does it get printed and then deleted (Cleared) when the forward method is executed.

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Chinmaya Chowdary

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posted 14 years ago

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Hi Nabila.

Wouldn't the out put be printed at all.. , Or does it get printed and then deleted (Cleared) when the forward method is executed.

No, it will not print. Before forward, the name that is got from form and 'In Cookie Test' will write to the buffer. Before forwarding, container will clear the buffer.

SCJP5.0, SCWCD5.0, OCEJPAD6, OCPJWSD6

Nabila Mohammad

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k..Thanks , Chinmaya!

One more thing...

When i write "out.println(...)" It gets written in the buffer.
And when i use forward() , the buffer gets cleared.

But what happens when i don't use forward()
When does it actually print in the stdout file from the buffer. (at what point)

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Salil Vverma

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Hey Nabila ,

When i write "out.println(...)" It gets written in the buffer.
And when i use forward() , the buffer gets cleared.

But what happens when i don't use forward()
When does it actually print in the stdout file from the buffer. (at what point)

Looks like you are getting confused with out and stdout. As you can see in the following line that out is PrintWriter object to the response, out.println("text") will always write the output in the response to the browser. To bring specific thing in stdout, you can either use System.out.println("text") ; function in your code or use specific logger api (like log4j)

I hope this would clear your confusion.

Regards
Salil Verma

Don't get me started about those stupid light bulbs.