I followed a tutorial showing how to submit a form in GAE and directed it to a servlet in the same app. When I submit the form the servlet responds but I can't read the data using getParameters() or any other method I searched for; I don't know if the problem is client or server or both. here is the entrypoint code:
public class HelloWorld implements EntryPoint { public void onModuleLoad() { // Create a FormPanel and point it at a service. final FormPanel form = new FormPanel(); form.setAction("http:// won let me write the host:8888/helloworld/receive"); form.setEncoding(FormPanel.ENCODING_MULTIPART); form.setMethod(FormPanel.METHOD_POST); // Create a panel to hold all of the form widgets. VerticalPanel panel = new VerticalPanel(); panel.setSpacing(10); form.setWidget(panel); // Create a TextBox, giving it a name so that it will be submitted. final TextBox tb = new TextBox(); tb.setWidth("220"); tb.setName("textBoxFormElement"); panel.add(tb); // Create a ListBox, giving it a name and // some values to be associated with its options. ListBox lb = new ListBox(); lb.setName("listBoxFormElement"); lb.addItem("item1", "item1"); lb.addItem("item2", "item2"); lb.addItem("item3", "item3"); lb.setWidth("220"); panel.add(lb); // Create a FileUpload widget. FileUpload upload = new FileUpload(); upload.setName("uploadFormElement"); panel.add(upload); // Add a 'submit' button. panel.add(new Button("Submit", new ClickHandler() { @Override public void onClick(ClickEvent event) { form.submit(); } })); // Add an event handler to the form. form.addSubmitHandler(new FormPanel.SubmitHandler() { @Override public void onSubmit(SubmitEvent event) { // This event is fired just before the form is submitted. // We can take this opportunity to perform validation. if (tb.getText().length() == 0) { Window.alert("The text box must not be empty"); event.cancel(); } } }); form.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() { @Override public void onSubmitComplete(SubmitCompleteEvent event) { // When the form submission is successfully completed, // this event is fired. Assuming the service returned // a response of type text/html, we can get the result // here. Window.alert(event.getResults()); } }); DecoratorPanel decoratorPanel = new DecoratorPanel(); decoratorPanel.add(form); // Add the widgets to the root panel. RootPanel.get().add(decoratorPanel); }
I tried 20 different things on the servlet to no avail. here is the code
public class FormHandler extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doPost(req, resp); System.out.println("got to servlet doPost"); System.out.println(req.getParameter("textBoxFormElement")); Enumeration e = req.getParameterNames(); while(e.hasMoreElements()) { String s = e.nextElement().toString(); System.out.println(s); } System.out.println("done for now"); } }
this is the output: got to servlet doPost....... ............null ........done for now
