I am trying to set up file uploading in an app and I am having trouble
with no sign of what is wrong.
My trouble is that when I click a button to submit a FormPanel,
nothing happens.
To make matters worst I get no error on tomcat logs or anywhere.
I am clueless as to what might be happenning.
This is my onModuleLoad() code:
//Create a FormPanel and point it at a service.
final FormPanel uploadForm = new FormPanel();
uploadForm.setAction(GWT.getModuleBaseURL() +
"wallpaperUploadService");
// Because we're going to add a FileUpload widget, we'll need to
set the
// form to use the POST method, and multipart MIME encoding.
uploadForm.setEncoding(FormPanel.ENCODING_MULTIPART);
uploadForm.setMethod(FormPanel.METHOD_POST);
// Create a panel to hold all of the form widgets.
VerticalPanel uploadPanel = new VerticalPanel();
uploadForm.setWidget(uploadPanel);
// Create a FileUpload widget.
FileUpload upload = new FileUpload();
upload.setName("uploadFormElement");
uploadPanel.add(upload);
// Add a 'submit' button.
Button uploadSubmitButton = new Button("Submit");
uploadPanel.add(uploadSubmitButton);
uploadSubmitButton.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
uploadForm.submit();
}
});
uploadForm.addFormHandler(new FormHandler() {
public void onSubmit(FormSubmitEvent event) {
}
public void onSubmitComplete(FormSubmitCompleteEvent event) {
Window.alert(event.getResults());
}
});
My servlet is code:
public class WallpaperUploadServlet extends HttpServlet implements
Servlet {
public void init(ServletConfig config) throws ServletException{
}
protected void doPost(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
response.setContentType("text/plain");
FileItem uploadItem = getFileItem(request);
if (uploadItem == null) {
response.getWriter().write("NO-SCRIPT-DATA");
return;
}
byte[] fileContents = uploadItem.get();
//TODO: add code to process file contents here. We will just
print it.
//System.out.println(new String(fileContents));
response.getWriter().write("GOT-DATA");
}
private FileItem getFileItem(HttpServletRequest request) {
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
try {
List items = upload.parseRequest(request);
Iterator it = items.iterator();
while (it.hasNext()) {
FileItem item = (FileItem) it.next();
if (!item.isFormField()
&& "uploadFormElement".equals(item.getFieldName())) {
return item;
}
}
} catch (FileUploadException e) {
return null;
}
return null;
}
}
web.xml:
<servlet>
<servlet-name>WallpaperUploadService</servlet-name>
<servlet-class>
net.newfoundcomm.attendant.server.WallpaperUploadServlet
</servlet-class>
<init-param>
<param-name>action-class</param-name>
<!-- Replace the action class name below with the fully
qualified name of the action class -->
<param-
value>net.newfoundcomm.attendant.WallpaperUploadActionClass</param-
value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>WallpaperUploadService</servlet-name>
<url-pattern>/wallpaperUploadService</url-pattern>
</servlet-mapping>
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