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 <url-pattern>/pdfservlet/*.pdf</url-pattern>
So, to get a PDF file called file1.pdf
add a link somewhere on your GWT page which is
<a href='" + GWT.getModuleBaseURL() + "pdfservlet/file1.pdf" + "'>Link
to file1</a>
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 <a...@mechnicality.com
<mailto:a...@mechnicality.com>> 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
<khi...@googlemail.com <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-plugin or save it to users file system
hth
On Wed, Jan 25, 2012 at 7:52 PM, Joshua Carey
<jc11...@gmail.com <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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