Displaying PDF BLOB in new window - GWT

2012-01-25 Thread Joshua Carey 
Hi everyone,

I currently am getting a BLOB from oracle and displaying it in a new 
window.  To accomplish this, I am reading the blob into a byte array, then 
writing the BYTE array out to the file system as pdf.  I then use 
"Window.open("URL to PDF on filesystem").  The problem is that I am writing 
all these blobs as PDF to the filesystem before being able to use the 
Window.open command in my GWT application.  How can I use 
Window.open("using the byte array") instead of having to write the PDF to 
the file system?  This would greatly help me and any help is appreciated. 
 I am calling the Window.open from within my "Presenter" class.  Just for 
your information.  Thank you very much.

Joshua

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Re: Displaying PDF BLOB in new window - GWT

2012-01-25 Thread kim young ill 
i would just use a Servlet/jsp at backend to read pdf-blob push the the
file back ( set the content-type header correctly ) so the browser can
decide to show it with pdf-viewer-plugin or save it to users file system

hth


On Wed, Jan 25, 2012 at 7:52 PM, Joshua Carey  wrote:

> Hi everyone,
>
> I currently am getting a BLOB from oracle and displaying it in a new
> window.  To accomplish this, I am reading the blob into a byte array, then
> writing the BYTE array out to the file si ystem as pdf.  I then use
> "Window.open("URL to PDF on filesystem").  The problem is that I am writing
> all these blobs as PDF to the filesystem before being able to use the
> Window.open command in my GWT application.  How can I use
> Window.open("using the byte array") instead of having to write the PDF to
> the file system?  This would greatly help me and any help is appreciated.
>  I am calling the Window.open from within my "Presenter" class.  Just for
> your information.  Thank you very much.
>
> Joshua
>
> --
> You received this message because you are subscribed to the Google Groups
> "Google Web Toolkit" group.
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> To post to this group, send email to google-web-toolkit@googlegroups.com.
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Re: Displaying PDF BLOB in new window - GWT

2012-01-25 Thread Joshua Carey 
Hi, since i'm using a gwt built application built by the company I work
for, I don't believe I have the option of adding another servlet or using
JSP.  What really sucks is that I have the thing working, however, I am
writing a pdf for every single record pulled back from the database.  Often
the user only wants to see one or two of the pdf's and to accomplish this,
I had to write literally hundreds to the filesystem that are not even being
viewed.  This is why I would like to just keep the byte array's for each
blob and route the byte array for the pdf the user selects to the
Window.open command I currently have.  My issue is that the only way I have
figured out how to open a pdf with Window.open in GWT is by writing the pdf
to the filesystem first and then giving the path to the PDF on the
filesystem.  It would be great if there was a way I could open the window
using the byte array containing the pdf blob.  Any ideas?

On Wed, Jan 25, 2012 at 1:40 PM, kim young ill wrote:

> i would just use a Servlet/jsp at backend to read pdf-blob push the the
> file back ( set the content-type header correctly ) so the browser can
> decide to show it with pdf-viewer-plugin or save it to users file system
>
> hth
>
>
> On Wed, Jan 25, 2012 at 7:52 PM, Joshua Carey  wrote:
>
>> Hi everyone,
>>
>> I currently am getting a BLOB from oracle and displaying it in a new
>> window.  To accomplish this, I am reading the blob into a byte array, then
>> writing the BYTE array out to the file si ystem as pdf.  I then use
>> "Window.open("URL to PDF on filesystem").  The problem is that I am writing
>> all these blobs as PDF to the filesystem before being able to use the
>> Window.open command in my GWT application.  How can I use
>> Window.open("using the byte array") instead of having to write the PDF to
>> the file system?  This would greatly help me and any help is appreciated.
>>  I am calling the Window.open from within my "Presenter" class.  Just for
>> your information.  Thank you very much.
>>
>> Joshua
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Google Web Toolkit" group.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msg/google-web-toolkit/-/R6jKcLzu6M4J.
>> To post to this group, send email to google-web-toolkit@googlegroups.com.
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>> google-web-toolkit+unsubscr...@googlegroups.com.
>> For more options, visit this group at
>> http://groups.google.com/group/google-web-toolkit?hl=en.
>>
>
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Re: Displaying PDF BLOB in new window - GWT

2012-01-25 Thread Alan Chaney 

Well, you could do what kim young ill proposed.

Adding a servlet to an existing GWT application to do what you want is a 
very small task. Simply create a class which extends HttpServlet, 
override the get method and add the servlet definition to your web.xml 
file - the same one as you have in the GWT project. All the libraries 
required to create a servlet are automatically in place in a GWT project 
because the RPC servlet and RequestFactory servlets are just sub-classes 
of HttpServlet.


To conform to the GWT rules you'll need to add it to a package 
com.yourcompy.blah.blah.server  to make sure that  GWT doesn't try and 
compile it into javascript. The java compiler will automatically compile 
it for you.


Then return the pdf with the content type set as application/pdf and, as 
the previous poster said, your browser will recognize it and handle it 
accordingly.


I think you'll find the solution above much easier - you may have to 
spend a few minutes searching the web for a few examples but I'd guess 
that there are literally thousands of examples of adding a simple 
servlet to serve pdfs and the like.


Regards

Alan




On 1/25/2012 12:37 PM, Joshua Carey wrote:
Hi, since i'm using a gwt built application built by the company I 
work for, I don't believe I have the option of adding another servlet 
or using JSP.  What really sucks is that I have the thing working, 
however, I am writing a pdf for every single record pulled back from 
the database.  Often the user only wants to see one or two of the 
pdf's and to accomplish this, I had to write literally hundreds to the 
filesystem that are not even being viewed.  This is why I would like 
to just keep the byte array's for each blob and route the byte array 
for the pdf the user selects to the Window.open command I currently 
have.  My issue is that the only way I have figured out how to open a 
pdf with Window.open in GWT is by writing the pdf to the filesystem 
first and then giving the path to the PDF on the filesystem.  It would 
be great if there was a way I could open the window using the byte 
array containing the pdf blob.  Any ideas?


On Wed, Jan 25, 2012 at 1:40 PM, kim young ill > wrote:


i would just use a Servlet/jsp at backend to read pdf-blob push
the the file back ( set the content-type header correctly ) so the
browser can decide to show it with pdf-viewer-plugin or save it to
users file system

hth


On Wed, Jan 25, 2012 at 7:52 PM, Joshua Carey mailto:jc11...@gmail.com>> wrote:

Hi everyone,

I currently am getting a BLOB from oracle and displaying it in
a new window.  To accomplish this, I am reading the blob into
a byte array, then writing the BYTE array out to the file si
ystem as pdf.  I then use "Window.open("URL to PDF on
filesystem").  The problem is that I am writing all these
blobs as PDF to the filesystem before being able to use the
Window.open command in my GWT application.  How can I use
Window.open("using the byte array") instead of having to write
the PDF to the file system?  This would greatly help me and
any help is appreciated.  I am calling the Window.open from
within my "Presenter" class.  Just for your information.
 Thank you very much.

Joshua
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Re: Displaying PDF BLOB in new window - GWT

2012-01-25 Thread Joshua Carey 
Ok, thanks for the advice.  Honestly, I would prefer adding all the logic I
am slated to code for this company in servlet/jsp, since I am very new to
GWT.  I have found things extremely difficult versus them being easy with
jsp/servlets.  Let me ask you this.  If the companys current site is gwt
and basically one of the tabs, has the logic they wan't me to change and
add to.  So say a user clicks the gwt tab for the page they want my
changes/additions on, fills in the search criteria, and instead of me going
to the gwt classes and servlet they have in place, i redirect to my new
servlet that outputs a new jsp, will this open up a completely different
browser window, or will it add another tab to the gwt project?  I'm
confused at how calling a new servlet or jsp from a GWT app will act?

In originating this question, I was hoping there were arguments with
Window.Open where I could output the blob without writing it to PDF first.
 But from the sounds of it, Window.open only accepts URL to physical files,
not objects like byte arrays or blobs??

Thanks again,

Joshua

On Wed, Jan 25, 2012 at 3:01 PM, Alan Chaney  wrote:

>  Well, you could do what kim young ill proposed.
>
> Adding a servlet to an existing GWT application to do what you want is a
> very small task. Simply create a class which extends HttpServlet, override
> the get method and add the servlet definition to your web.xml file - the
> same one as you have in the GWT project. All the libraries required to
> create a servlet are automatically in place in a GWT project because the
> RPC servlet and RequestFactory servlets are just sub-classes of HttpServlet.
>
> To conform to the GWT rules you'll need to add it to a package
> com.yourcompy.blah.blah.server  to make sure that  GWT doesn't try and
> compile it into javascript. The java compiler will automatically compile it
> for you.
>
> Then return the pdf with the content type set as application/pdf and, as
> the previous poster said, your browser will recognize it and handle it
> accordingly.
>
> I think you'll find the solution above much easier - you may have to spend
> a few minutes searching the web for a few examples but I'd guess that there
> are literally thousands of examples of adding a simple servlet to serve
> pdfs and the like.
>
> Regards
>
> Alan
>
>
>
>
>
> On 1/25/2012 12:37 PM, Joshua Carey wrote:
>
> Hi, since i'm using a gwt built application built by the company I work
> for, I don't believe I have the option of adding another servlet or using
> JSP.  What really sucks is that I have the thing working, however, I am
> writing a pdf for every single record pulled back from the database.  Often
> the user only wants to see one or two of the pdf's and to accomplish this,
> I had to write literally hundreds to the filesystem that are not even being
> viewed.  This is why I would like to just keep the byte array's for each
> blob and route the byte array for the pdf the user selects to the
> Window.open command I currently have.  My issue is that the only way I have
> figured out how to open a pdf with Window.open in GWT is by writing the pdf
> to the filesystem first and then giving the path to the PDF on the
> filesystem.  It would be great if there was a way I could open the window
> using the byte array containing the pdf blob.  Any ideas?
>
> On Wed, Jan 25, 2012 at 1:40 PM, kim young ill wrote:
>
>> i would just use a Servlet/jsp at backend to read pdf-blob push the the
>> file back ( set the content-type header correctly ) so the browser can
>> decide to show it with pdf-viewer-plugin or save it to users file system
>>
>> hth
>>
>>
>>  On Wed, Jan 25, 2012 at 7:52 PM, Joshua Carey  wrote:
>>
>>> Hi everyone,
>>>
>>> I currently am getting a BLOB from oracle and displaying it in a new
>>> window.  To accomplish this, I am reading the blob into a byte array, then
>>> writing the BYTE array out to the file si ystem as pdf.  I then use
>>> "Window.open("URL to PDF on filesystem").  The problem is that I am writing
>>> all these blobs as PDF to the filesystem before being able to use the
>>> Window.open command in my GWT application.  How can I use
>>> Window.open("using the byte array") instead of having to write the PDF to
>>> the file system?  This would greatly help me and any help is appreciated.
>>>  I am calling the Window.open from within my "Presenter" class.  Just for
>>> your information.  Thank you very much.
>>>
>>> Joshua
>>>  --
>>> You received this message because you are subscribed to the Google
>>> Groups "Google Web Toolkit" group.
>>> To view this discussion on the web visit
>>> https://groups.google.com/d/msg/google-web-toolkit/-/R6jKcLzu6M4J.
>>> To post to this group, send email to google-web-toolkit@googlegroups.com
>>> .
>>> To unsubscribe from this group, send email to
>>> google-web-toolkit+unsubscr...@googlegroups.com.
>>> For more options, visit this group at
>>> http://groups.google.com/group/google-web-toolkit?hl=en.
>>>
>>
>> --
>> You received thi

Re: Displaying PDF BLOB in new window - GWT

2012-01-25 Thread Alan Chaney 

On 1/25/2012 3:33 PM, Joshua Carey wrote:
Ok, thanks for the advice.  Honestly, I would prefer adding all the 
logic I am slated to code for this company in servlet/jsp, since I am 
very new to GWT.  I have found things extremely difficult versus them 
being easy with jsp/servlets.  Let me ask you this.  If the companys 
current site is gwt and basically one of the tabs, has the logic they 
wan't me to change and add to.  So say a user clicks the gwt tab for 
the page they want my changes/additions on, fills in the search 
criteria, and instead of me going to the gwt classes and servlet they 
have in place, i redirect to my new servlet that outputs a new jsp, 
will this open up a completely different browser window, or will it 
add another tab to the gwt project?  I'm confused at how calling a new 
servlet or jsp from a GWT app will act?


Create a servlet which can go to your database and return the PDF when 
you do a "get" call. Lets assume that the url to that is:


http://mycompany.com/gwtmodule/pdfservlet/

where the GWT module name is gwtmodule and the web.xml has a servlet 
definition with a /pdfservlet/*.pdf



So, to get a PDF file called file1.pdf

add a link somewhere on your GWT page which is

Link 
to file1


You can do this by

A.  generating the HTML directly and injecting it into an HTML widget
B.  or by using an InlineHyperlink
C.  or a Hyperlink widget. See the javadocs for details.
D.  or an Anchor widget (possibly the easiest)

For example:

 Anchor anchor = new Anchor();
 anchor.setText("Link to file1.pdf");
 anchor.setHref(GWT.getModuleBaseURL() +  "pdfservlet/file1.pdf");

 and then add the anchor to the container widget you want to place it on.


When your user clicks on that link it will generate an HTTP GET request 
to http://mycompany.com/gwtmodule/pdfservlet/file1.pdf.


Your servlet should then render the PDF as a stream of bytes using the 
response.getOutputStream() method of the servlet. Don't forget to set 
the length and the content type into the response as well.



HTH

Alan












In originating this question, I was hoping there were arguments with 
Window.Open where I could output the blob without writing it to PDF 
first.  But from the sounds of it, Window.open only accepts URL to 
physical files, not objects like byte arrays or blobs??


Thanks again,

Joshua

On Wed, Jan 25, 2012 at 3:01 PM, Alan Chaney > wrote:


Well, you could do what kim young ill proposed.

Adding a servlet to an existing GWT application to do what you
want is a very small task. Simply create a class which extends
HttpServlet, override the get method and add the servlet
definition to your web.xml file - the same one as you have in the
GWT project. All the libraries required to create a servlet are
automatically in place in a GWT project because the RPC servlet
and RequestFactory servlets are just sub-classes of HttpServlet.

To conform to the GWT rules you'll need to add it to a package
com.yourcompy.blah.blah.server  to make sure that  GWT doesn't try
and compile it into javascript. The java compiler will
automatically compile it for you.

Then return the pdf with the content type set as application/pdf
and, as the previous poster said, your browser will recognize it
and handle it accordingly.

I think you'll find the solution above much easier - you may have
to spend a few minutes searching the web for a few examples but
I'd guess that there are literally thousands of examples of adding
a simple servlet to serve pdfs and the like.

Regards

Alan





On 1/25/2012 12:37 PM, Joshua Carey wrote:

Hi, since i'm using a gwt built application built by the company
I work for, I don't believe I have the option of adding another
servlet or using JSP.  What really sucks is that I have the thing
working, however, I am writing a pdf for every single record
pulled back from the database.  Often the user only wants to see
one or two of the pdf's and to accomplish this, I had to write
literally hundreds to the filesystem that are not even being
viewed.  This is why I would like to just keep the byte array's
for each blob and route the byte array for the pdf the user
selects to the Window.open command I currently have.  My issue is
that the only way I have figured out how to open a pdf with
Window.open in GWT is by writing the pdf to the filesystem first
and then giving the path to the PDF on the filesystem.  It would
be great if there was a way I could open the window using the
byte array containing the pdf blob.  Any ideas?

On Wed, Jan 25, 2012 at 1:40 PM, kim young ill
mailto:khi...@googlemail.com>> wrote:

i would just use a Servlet/jsp at backend to read pdf-blob
push the the file back ( set the content-type header
correctly ) so the browser can decide to show it with
pdf-viewer-plug