Tapping into Stripes - Stripes...and Java Web Development is Fun Again - page 270

Download email_29/src/stripesbook/ext/MyExceptionHandler.java
public Resolution catchAttachmentsTooBig(
FileUploadLimitExceededException exc,
HttpServletRequest req, HttpServletResponse resp)

{

return new RedirectResolution(MessageComposeActionBean. class ,
"recover")
.addParameter("maximumSize", exc.getMaximum())
.addParameter("postedSize", exc.getPosted());

}

This will set the maximumSize and postedSize parameters and call the
recover ( ) event handler. So, we add properties for the parameters and a
recover ( ) method in MessageComposeActionBean :

Download email_29/src/stripesbook/action/MessageComposeActionBean.java
public Resolution recover() {
ValidationError error = new LocalizableError(
"maximumUpload", postedSize, maximumSize);
getContext().getValidationErrors().add("attachments", error);
return new ForwardResolution(COMPOSE);

}
public long maximumSize, postedSize;

We add the error message text in the resource bundle and the

<s:errors> tag in the JSP:

Download email_29/res/StripesResources.properties

stripesbook.action.MessageComposeActionBean.maximumUpload=\
Total attachment size ({2} bytes) exceeds the limit ({3} bytes).

Download email_29/web/WEB-INF/jsp/message_compose.jsp

<div><fmt:message key="messageCompose.attachments"/> : </div>
<div><s:errors field="attachments"/></div>
<div class="left">
<c:forEach var="index" begin="0" end="3">
<div><s:file name="attachments[${index}]"/></div>
</c:forEach>
</div>

The user will now see the informative message shown in Figure 13.4 ,
on the following page, and the user will have a chance to try again,
instead of being sent to a generic error page. That plan came together
rather nicely, wouldn't you say?

We now have a place where we can neatly recover from exceptions. Let's
continue our quest to master the inner workings of Stripes and move
on to the intricate details of URL bindings.