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How do I download a file in a Struts Portlet?

 
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In plain Struts it is easy:
response.setContentType("application/pdf");
response.setHeader("Content-disposition","attachment;filename=x.pdf");
java.io.PrintWriter out = arg3.getWriter();
out.print("<output>");
out.print("test raise file dialog example output");
out.print("</output>");
But I don't know how to access the HttpServletResponse object. I tried to cast the PortletResponse object in the execute method, which compiles and runs, but I get exceptions afterwards.
Is there any way to do this in during the render phase of the portlet?
I probably can execute the above code in the JSP, but doing it in the JSP is ugly.

I appreaciate your help,

Alejandro Barrero
 
Alejandro Barrero
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I just found out that the code I provided doesn't run in a portlet because portlets only allow mime type text/html (tha's all they display). The solution then is to invoke, from the porlet, a servlet or a JSP that runs outside of the portal. Unfortunately, I have not been able to find a way to do this; In Tomcat, I can run a JSP easily with JavaScript (window.open("MyJsp.jsp"))--It works fine if the jsp is in the default directory. However, this does not work with a portlet. It appears that the portlet server interprets URLs in a different way.

Can somebody tell me how to use window.open("MyJsp.jsp") with a portlet server?

Thanks,

Alejandro Barrero
 
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I believe that the download from portlet is not feasible directly.
Please use indirect way i.e. a redirect request from jsp to the servlet.

Try this
<%String downloadPrefix = URLHelper.getServerBaseURL(request)+portletResponse.encodeURL("<ServletName>"); %>
window.open("<%=downloadPrefix%>");


where
URLHelper.getServerBaseURL is
public static String getServerBaseURL(HttpServletRequest request){
String strBaseURL = request.getScheme() + "://" + request.getServerName();
strBaseURL += request.getServerPort()>0 ? ":" + request.getServerPort() : "";
return strBaseURL;

}
Good Luck!
 
Vj Borkar
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Something is weird in last post,
missed following things

[ May 30, 2007: Message edited by: Vijaykumar Borkar ]
 
Alejandro Barrero
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Thank you very much Vijaykumar. You gave me great ideas. The first thing is you have to create a servlet outside of the portlet; in the web.xml it looks like:
<servlet>
<description>
download</description>
<display-name>
Download</display-name>
<servlet-name>download</servlet-name>
<servlet-class>
com.cfmswc.training_dep.servlets.Download</servlet-class>
</servlet>
The next thing is to construct the URL for the server in the JSP:
<%<br /> // Create the base URL for the server.<br /> String serverURL = renderResponse.encodeURL(renderRequest<br /> .getContextPath()<br /> + "");<br /> %>
Finally, create a link:
<a href="<%=serverURL% rel="nofollow">/download?file=pdf/<bean:write name="trainingModule" property="pdf"/>"><img src="<%=serverURL%>/images/Acrobat_Button.gif" alt="Download" height="20" width="20" />
 
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