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Caching rendered html in jsp

 
Viidhya Kishore
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Hello All,

My requirement is to capture the html that has been rendered in jsp and convert into PDF.
I wanted help as to how to access the rendered html from the jsp.

Also, in case there is an alternate way, I would be happy to know that too.

Thanks.
 
Joe carco
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This is just a wild guess, but maybe it'll work

write a servlet Filter that intercepts your servlet. in the doFilter() method capture the ServletOutputStream from the ServletResponse
 
Viidhya Kishore
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Thanks for the reply.

Can you tell me how to read bytes from a response object?

Thanks.
 
Bear Bibeault
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You can't. You'll probably need to implement a ResponseWrapper.

SearchFirst and you may find what you need.
 
Viidhya Kishore
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I tried to achieve it using a filter.
However I am stuck at the filtermapping in web.xml.

My url is as such:
objectHandle=Coding&actionHandle/initProjectForCoding&nextPage/coding/quickCode.grs

where object handle specifies the business object, and the action handle specifies the method to be executed. The nextpage denotes another controller call which generates the response.

This is the entry I have in web.xml


The way I have specified the filter mapping doesnt hit the filter.(I have a breakpoint in the filter and it never gets there).

Any help?
 
Paul Clapham
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First of all, that isn't a valid URL. And second, it doesn't even contain the string "codingGridController", so I don't know why you would expect the filter to be invoked for it.
 
Viidhya Kishore
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The URl works. I do get the request from the jsp.

ProxyServlet&objectHandle=Coding&actionHandle/initProjectForCoding&nextPage/coding/quickCode.grs

The "/coding/quickCode.grs " points to a method in the codingGridController.

additional mappings:


 
Paul Clapham
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Paul Clapham wrote:... it doesn't even contain the string "codingGridController", so I don't know why you would expect the filter to be invoked for it.
 
Viidhya Kishore
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I tried a different approach.
I am trying to use an Interceptor with ResponseWrapper to achieve this.

The interceptor postHandle method is invoked fine.
But the response wrapper isnt working well.
Any help?

 
Paul Clapham
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"Isn't working well"?

Pity about that. You might consider posting some details about why it isn't working well. Read this: ItDoesntWorkIsUseless if you don't see why you should post details.
 
Viidhya Kishore
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I tried a totally different approach to achieve this.
I am using a java library to convert the html to pdf.

The pdf file is created fine but when I try to open it it says " the volume for a file has been externally altered so that the opened file is no longer valid"

Any idea why this is occuring?

 
Vinoth Thirunavukarasu
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Actually this methodology won't work.
Simple way is to do by just store the output data into a object and write it into pdf response object.
Viidhya Kishore wrote:Hello All,

My requirement is to capture the html that has been rendered in jsp and convert into PDF.
I wanted help as to how to access the rendered html from the jsp.

Also, in case there is an alternate way, I would be happy to know that too.

Thanks.
 
Viidhya Kishore
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Thanks for your reply Vinoth.
Any code snippet to help?
 
Vinoth Thirunavukarasu
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Try using iText.jar for creating pdf document
 
M Jiva
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I too want the same this, i.e to get the response in pdf format and without creating any intermediate file (which iText will create)..
please provide any example code if any of you have..
I think this can be done with streams but do not have a working code..
please help..
 
Viidhya Kishore
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I used a tool called wkhtmltopdf.
wkhtmltopdf

I started with getting the html of the page using document.documentElement.innerHTML
I then sent the html from the client to the server in Ajax call.
Retrieved the html at the server and wrote out a html file.

Then used wkhtmltopdf on it.
Html File : Save as q.html in the dir.


Create a dir and download wkhtmltopdf from the link provided. I am using version 0.99
Save the html file on that dir.
Now in command prompt, cd to that dir and then execute


Look in the dir now. You will see pdf. Neat right?
 
It is sorta covered in the JavaRanch Style Guide.
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