/**
* Determine an appropriate FileUpload instance for the given encoding.
*
* <p>Default implementation returns the shared FileUpload instance if the encoding matches, else
* creates a new FileUpload instance with the same configuration other than the desired encoding.
*
* @param encoding the character encoding to use
* @return an appropriate FileUpload instance.
*/
protected FileUpload prepareFileUpload(String encoding) {
FileUpload fileUpload = getFileUpload();
FileUpload actualFileUpload = fileUpload;
// Use new temporary FileUpload instance if the request specifies
// its own encoding that does not match the default encoding.
if (encoding != null && !encoding.equals(fileUpload.getHeaderEncoding())) {
actualFileUpload = newFileUpload(getFileItemFactory());
actualFileUpload.setSizeMax(fileUpload.getSizeMax());
actualFileUpload.setHeaderEncoding(encoding);
}
return actualFileUpload;
}
/**
* Parse the given servlet request, resolving its multipart elements.
* @param request the request to parse
* @return the parsing result
* @throws MultipartException if multipart resolution failed.
*/
protected MultipartParsingResult parseRequest(HttpServletRequest request) throws MultipartException {
String[] encoding = determineEncoding(request);
String contentType = request.getContentType();
if(contentType != null && !contentType.equals(MultipartResolver.mimetype_application_octet_stream))
{
FileUpload fileUpload = prepareFileUpload(encoding[1] == null?encoding[0]:encoding[1]);
try {
List fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);
return parseFileItems(fileItems, encoding,request);
}
catch (FileUploadBase.SizeLimitExceededException ex) {
throw new MaxUploadSizeExceededException(fileUpload.getSizeMax(), ex);
}
catch (FileUploadException ex) {
throw new MultipartException("Could not parse multipart servlet request", ex);
}
}
else
{
return parseOctetFileItems(request);
}
}
