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@UiTemplate("FileUploadViewuixml") interface Binder extends UiBinder<FormPanel, FileUploadView> { } @UiField FormPanel uploadForm; @UiField FileUpload fileToUpload; @UiField Button uploadButton; SimpleCallback<SubmitCompleteEvent> onSubmitCompleteCallback; SimpleCallback<SubmitEvent> onSubmitCallback; SimpleCallback<Object> onUploadClickCallback; private static final Binder binder = GWTcreate(Binderclass); public FileUploadView() { final FormPanel dlp = bindercreateAndBindUi(this); initWidget(dlp); uploadFormsetAction("/mvpproject/fileprocess"); uploadFormsetEncoding(FormPanelENCODING_MULTIPART); uploadFormsetMethod(FormPanelMETHOD_POST); } @Override public String getFileToUploadName() { return fileToUploadgetFilename(); } @UiHandler("uploadForm") public void onSubmitComplete(final SubmitCompleteEvent event) { onSubmitCompleteCallbackgoBack(event); } @UiHandler("uploadForm") public void onSubmitForm(final SubmitEvent event) { onSubmitCallbackgoBack(event); } @Override public void setSubmitCallback(final SimpleCallback<SubmitEvent> scb) { onSubmitCallback = scb; } @Override public void setSubmitCompleteCallback( final SimpleCallback<SubmitCompleteEvent> scb) {
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onSubmitCompleteCallback = scb; } @Override public void setUploadClickCallback(final SimpleCallback<Object> scb) { onUploadClickCallback = scb; } @Override public void submitForm() { uploadFormsubmit(); } @UiHandler("uploadButton") void uiOnUploadClick(final ClickEvent event) { onUploadClickCallbackgoBack(null); } }
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Let s now go to the Presenter code, which actually does the work
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package comfkerekimvpprojectclientfileUpload; // imports public class FileUploadPresenter extends Presenter<FileUploadDisplay> { public static String PLACE = "upload"; public FileUploadPresenter( final String params, final FileUploadDisplay fileUploadDisplay, final Environment environment) { super(params, fileUploadDisplay, environment); fileUploadDisplay setUploadClickCallback(new SimpleCallback<Object>() { @Override public void goBack(final Object result) { if (getDisplay()getFileToUploadName()isEmpty()) { getEnvironment()showAlert( "You must pick a file to upload"); } else { getDisplay()submitForm(); } } });
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fileUploadDisplay setSubmitCallback(new SimpleCallback<SubmitEvent>() { @Override public void goBack(final SubmitEvent result) { // you could check for special conditions // if the event cannot proceed, then do: // resultcancel(); // As an alternative, these checks could go // in the button click method } }); fileUploadDisplay setSubmitCompleteCallback(new SimpleCallback<SubmitCompleteEvent>() { @Override public void goBack(final SubmitCompleteEvent result) { // do something when the file process is done } }); } }
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We aren t including any feedback here while the file is being uploaded; we ll get to that later, and it will involve adding some code to the Submit event handler
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Now, let s turn to the server-side file processing servlet (Of course, this code could also be a PHP script, for example, because we are dealing with standard HTML form submission; let s keep to Java to go along with GWT s orientation) Get and add the Apache Commons commons-fileupload and commons-io jars to your application, and then you ll be able to easily get and process the uploaded files3 You ll also have to modify the webxml file for your project, to include the information on your servlet In a rapt of inspiration, I named the servlet fileProcess, and thus I added the following lines to the said XML file:
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<servlet> <servlet-name>fileProcess</servlet-name> <servlet-class>comfkerekimvpprojectserverFileProcess</servlet-class> </servlet> 3 See http://commonsapacheorg/ for this
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<servlet-mapping> <servlet-name>fileProcess</servlet-name> <url-pattern>/mvpproject/fileprocess</url-pattern> </servlet-mapping>
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Our servlet code is as follows For now, we ll just care about the doPost() method; we ll later use the doGet() method to provide feedback to the user
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package comfkerekimvpprojectserver; // imports public class FileProcess extends HttpServlet { @Override protected void doPost( final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException { final FileItemFactory factory = new DiskFileItemFactory(); final ServletFileUpload upload = new ServletFileUpload(factory); try { final List<FileItem> itemsList = uploadparseRequest(request); for (final FileItem item : itemsList) { if (!itemisFormField()) { final InputStream input = itemgetInputStream(); final FileOutputStream output = new FileOutputStream( "/tmp/dummy"); final byte[] buf = new byte[1024]; int len; while ((len = inputread(buf)) > 0) { outputwrite(buf, 0, len); } outputclose(); inputclose(); } } } catch (final FileUploadException e) { throw new ServletException(egetMessage()); } } }
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We are just receiving the file and saving it to /tmp/dummy probably not quite useful in a true-life system! The code uses the Commons API; there s nothing GWT-specific in there This kind of programming is actually quite classic non-Ajax servlet code; for example, you could have also provided parameters to the servlet by using hidden fields or form fields, if desired You could even have access to the session and apply all the usual web processing methods you knew before using GWT4 As to the code itself, note there s a loop that processes all form items, discarding mere fields, to process all the uploaded files (This would allow you to process several files at once) You can use the getSize() method to get the file total size (and possibly discard too large files), and getName() to get the original file name, among other methods