save an uploaded file with GWT - gwt

Question

I am using org.apache.commons.fileupload to upload.
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
GWT.log("is multipart? " + Boolean.toString(isMultipart), null);
ServletFileUpload upload = new ServletFileUpload();
try{
FileItemIterator iter = upload.getItemIterator(request);
while (iter.hasNext()) {
FileItemStream item = iter.next();
String name = item.getFieldName();
InputStream stream = item.openStream() ;
/**
* Save th uploaded file
*/
}
}
catch(Exception e){
e.printStackTrace();
}
}
How can I save the uploaded file?

Answer 1

This looks like server-side code, which (aside from GWT-RPC servlets) is not specific to GWT at all. That GWT.log() is unnecessary -- replace it with a regular logging call, and handle the upload as you normally would in non-GWT code, since that's what it is.
Here is a helpful example of using apache's fileupload to get you started.

Answer 2

I think this can help you.
if (!item.isFormField()) {
String fieldName = item.getFieldName();
String fileName = item.getName();
String contentType = item.getContentType();
boolean isInMemory = item.isInMemory();
long sizeInBytes = item.getSize();
File saveTo = new File("/file_uploads/" + fileName);
try {
item.write(saveTo);
...
}
catch (Exception e){
...
}
Keep in mind that uploaded file may already be automatically saved by org.apache.commons.fileupload
You can set size threshold for file to be saved on disk or loaded in memory using
// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();
// Set factory constraints
factory.setSizeThreshold(yourMaxMemorySize);
factory.setRepository(yourTempDirectory);
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// Set overall request size constraint
upload.setSizeMax(yourMaxRequestSize);
// Parse the request
List /* FileItem */ items = upload.parseRequest(request);
Everything you need to know about org.apache.commons.fileupload is here: Using FileUpload