Wes Wannemacher wrote:
>
>
> On Mon, 2008-03-10 at 14:59 -0700, Dave Newton wrote:
>> --- "Kelly.Graus" <[EMAIL PROTECTED]> wrote:
>> > Is it possible to specify more than one SUCCESS result for an action?
>> For
>> > example, when the user runs an action, it could prompt them to download
>> a
>> > file (using the stream result type), and then redirect them to another
>> > page?
>>
>> Names should be unique to a single result, otherwise there'd be no (easy)
>> way
>> to distinguish them. Depending on how you actually want the above
>> scenario to
>> work there are probably a few other options.
>>
>> Dave
>
>
> Probably the most common practice would be to have your "success" result
> contain a meta-refresh that redirects to the action which will spit out
> your file (by stream result). If the file download requires some
> precondition to be met, then you'll probably have to set a flag in the
> user's session, since the meta-refresh will generate a whole new
> request. The advantage of this scenario is that your user will not end
> up looking at a blank page, or his/her previously filled out form (and
> potentially submitting more than once).
>
> -Wes
>
>
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>
Hi Wes,
I tried implementing this using a meta-refresh. It kind of worked, but it
had some problems. I'm simplifying the solution I came up with so I can
concentrate on getting the file downloading part working. If you have any
hints on this, I would appreciate it.
Currently I have a jsp page that creates links to a DownloadLesson action,
and passes in a couple of parameters that describe what needs to be
downloaded. The DownloadLesson action looks like this:
<action name="DownloadLesson"
class="net.toltech.lessondownloader.webapp.action.DownloadLessonAction">
<result type="stream">
application/octet-stream
${contentDisposition}
${contentLength}
</result>
</action>
Here are the important parts of the DownloadLessonAction:
public class DownloadLessonAction extends ActionSupport implements
SessionAware, ServletContextAware {
public String execute() {
//Look up the lesson in the current download key.
DownloadKey downloadKey = (DownloadKey)getSession().get(
"downloadKey" );
if( downloadKey != null ) {
//Get the lesson using the lesson identifier and
version.
Lesson lesson = downloadKey.getLesson(
getLessonIdentifier(), new
Version( getVersion() ) );
if( lesson != null ) {
this.lesson = lesson;
return SUCCESS;
}
}
return ERROR;
}
public java.io.InputStream getInputStream() {
if( lesson != null ) {
java.io.InputStream inputStream =
servletContext.getResourceAsStream(
lesson.getFilePath() );
try {
length = inputStream.available();
} catch( java.io.IOException e ) {}
return inputStream;
}
return null;
}
public String getContentDisposition() {
String filename = lesson.getFilePath().substring(
lesson.getFilePath().lastIndexOf( "/" ) + 1 );
return "attachement;filename=" + filename;
}
public String getContentLength() {
return new Integer( length ).toString();
}
The above is kind of working. I click on the download link, and the Save
dialog pops up, giving me the option to Open or Save the file. As soon as I
select the Save button, 4 exceptions get thrown. The first is
java.net.SocketException: Connection reset by peer: socket write error. The
other 3 are java.net.SocketException: Software caused connection abort:
socket write error.
However, the file does get downloaded, so I'm wondering if I'm getting these
exceptions because I have debugging turned on. So I guess my question is,
am I doing anything incorrect in how I'm accessing the file resource, and
how I'm returning the InputStream.
Once I figure out why I'm getting these exceptions, then I will go back to
trying to use the meta refresh to move to a different page.
Thanks!
Kelly
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