Re: DWR - obtaining a path in remote method

>
> David Marginian-3 wrote:
>  
>> Have you tried using the FacesExtensionFilter?  I don't use JSF but it
>> looks like this may give you access to the FacesContext:
>> http://directwebremoting.org/dwr/server/jsf
>>
>> Depending on what version of DWR you are using the docs may be outdated,
>> the package of the filter has changed:
>> org.directwebremoting.faces.FacesExtensionFilter
>>
>> Look at the source of the class to see if it will help you out.
>>
>> JBuilderDoug wrote:
>>    
>>> I have a retrieve button on my form that calls a javascript that sends a
>>> request back to my application on the server.  The server method gets
>>> information from a MySQL database and sends it back as a string [] to the
>>> javascript.  The java script parses the string and populates fields on
>>> the
>>> form.  All well and good.
>>>
>>> Now I need for the server method to retrieve the text data and also
>>> retrieve
>>> and image (BLOB) from MySQL, write it to a file, then send the filename
>>> back
>>> with the other text data for display.
>>>
>>> My problem is that (I'm using JSF) that the DWR method in my application
>>> on
>>> the server is not privvy to FacesContext (which makes sense).  My
>>> directory
>>> is images/<filename>, but that's a relative path.  If I wrote to
>>> images/<filename>, it would try to write to an "images" directory under
>>> glassfish\bin (since I'm deployed under glassfish) and that's the literal
>>> current directory.
>>>
>>> I need to get the real path to write the image file (something like
>>> c:\glassfish\domains\domain1\autodeploy\<my app name>\images.
>>>
>>> Then what I can pass back to the javascript is simply images\<filename>
>>>
>>> Surely, there's some context I can hook into once the javascript gets
>>> back
>>> to the server?
>>>  
>>>      
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>>    
>
> I solved this problem with some dwr stuff... here's how.  Turns out it
> didn't solve my ultimate problem however.
>
> import org.directwebremoting.WebContext;
> import org.directwebremoting.WebContextFactory;
> import javax.servlet.http.HttpServletRequest;
> import javax.servlet.http.HttpSession;
> .
> .
> .
> java.sql.Blob b = users.getUserImage();  // retrieve BLOB from MySQL
> byte [] ba = b.getBytes(1, (int)b.length());  // put it in a byte []
> WebContext wctx = WebContextFactory.get();  // Get the context
>              HttpSession session = wctx.getSession();  // Get the session
>              HttpServletRequest request = wctx.getHttpServletRequest();  //
> Get the http request String sPath =
> (session.getServletContext().getRealPath(request.getContextPath()));
> sPath = sPath + "/images/" + users.getUsername() + ".jpg";
> File f = new File(sPath);
> FileOutputStream fos = new FileOutputStream(f);
> fos.write(ba);
> fos.close();
>
> All of the text fields are returned to the javascript along with
> "images/<username>.jpg" which I innerHTML into the page, but since it
> doesn't refresh, the image never shows up.
>
> I don't know how to force that read without a page refresh.   Maybe DWR/AJAX
> doesn't solve all problems.
>
>
>