I implemented a simple image uploader which relies on the form panel. I
pass an image file via a filupload widget and a multipart encoding to the
server which then processes the image, stores it on the disk and returns
the image file path as a text/html response. On the client side I have an
onSubmitCompleted event handler that sets the image widget url to the one
returned by the servlet.
The onSubmitCompleted handler is sometimes (actually quite often) not
called. I checked with firebug, the servlet does return the right file
path, the image is stored, etc... The servlet also gets fully executed with
no error (checked with various traces). I have the behavior for (at least)
FF16. I have the issue in hosted mode or in compiled ran locally (with the
embedded jetty).
Here's my servlet code:
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
try {
// default values for width and height
int width = 50;
int height = 50;
InputStream filecontent = null;
String saveFile = null;
List<FileItem> items = new ServletFileUpload(new
DiskFileItemFactory()).parseRequest(request);
for (FileItem item : items) {
if (item.isFormField()) {
String fieldName = item.getFieldName();
String fieldValue = item.getString();
if(fieldName.equalsIgnoreCase("width")) {
width = Integer.parseInt(fieldValue);
}
if(fieldName.equalsIgnoreCase("height")) {
height = Integer.parseInt(fieldValue);
}
} else {
String fieldName = item.getFieldName();
saveFile = FilenameUtils.getName(item.getName());
if(fieldName.equalsIgnoreCase("image")) {
filecontent = item.getInputStream();
}
}
}
// check values
if(filecontent == null) {
throw new FileNotFoundException("no file provided");
}
// Process the input stream
ByteArrayOutputStream out = new ByteArrayOutputStream();
int len;
byte[] buffer = new byte[8192];
while ((len = filecontent.read(buffer, 0, buffer.length)) !=
-1) {
out.write(buffer, 0, len);
}
String imagePath = processAndStoreImage(out, saveFile, width,
height);
System.out.println(imagePath);
// return the url of the file
writer.println(imagePath);
} catch (Exception e) {
writeError(writer, "Error whilst processing and storing
image.");
} finally {
writer.flush();
writer.close();
}
}
and the onSubmitHandler
imageForm.addSubmitCompleteHandler(new
FormPanel.SubmitCompleteHandler() {
public void onSubmitComplete(SubmitCompleteEvent event) {
final String result = event.getResults();
// update thumbnail view with new image
thumbnailImage.setUrl(result);
Window.alert("YES");
}
});
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