private String getPartName(MethodParameter parameter) {
RequestPart annot = parameter.getParameterAnnotation(RequestPart.class);
String partName = (annot != null ? annot.value() : "");
if (partName.length() == 0) {
partName = parameter.getParameterName();
Assert.notNull(
partName,
"Request part name for argument type ["
+ parameter.getParameterType().getName()
+ "] not specified, and parameter name information not found in class file either.");
}
return partName;
}
@Override
public Object resolveArgument(
MethodParameter parameter,
ModelAndViewContainer mavContainer,
NativeWebRequest request,
WebDataBinderFactory binderFactory)
throws Exception {
HttpServletRequest servletRequest = request.getNativeRequest(HttpServletRequest.class);
assertIsMultipartRequest(servletRequest);
MultipartHttpServletRequest multipartRequest =
WebUtils.getNativeRequest(servletRequest, MultipartHttpServletRequest.class);
String partName = getPartName(parameter);
Object arg;
if (MultipartFile.class.equals(parameter.getParameterType())) {
Assert.notNull(
multipartRequest,
"Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
arg = multipartRequest.getFile(partName);
} else if (isMultipartFileCollection(parameter)) {
Assert.notNull(
multipartRequest,
"Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
arg = multipartRequest.getFiles(partName);
} else if (isMultipartFileArray(parameter)) {
Assert.notNull(
multipartRequest,
"Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
List<MultipartFile> files = multipartRequest.getFiles(partName);
arg = files.toArray(new MultipartFile[files.size()]);
} else if ("javax.servlet.http.Part".equals(parameter.getParameterType().getName())) {
assertIsMultipartRequest(servletRequest);
arg = servletRequest.getPart(partName);
} else if (isPartCollection(parameter)) {
assertIsMultipartRequest(servletRequest);
arg = new ArrayList<Object>(servletRequest.getParts());
} else if (isPartArray(parameter)) {
assertIsMultipartRequest(servletRequest);
arg = RequestPartResolver.resolvePart(servletRequest);
} else {
try {
HttpInputMessage inputMessage =
new RequestPartServletServerHttpRequest(servletRequest, partName);
arg = readWithMessageConverters(inputMessage, parameter, parameter.getParameterType());
WebDataBinder binder = binderFactory.createBinder(request, arg, partName);
if (arg != null) {
validate(binder, parameter);
}
mavContainer.addAttribute(
BindingResult.MODEL_KEY_PREFIX + partName, binder.getBindingResult());
} catch (MissingServletRequestPartException ex) {
// handled below
arg = null;
}
}
RequestPart annot = parameter.getParameterAnnotation(RequestPart.class);
boolean isRequired = (annot == null || annot.required());
if (arg == null && isRequired) {
throw new MissingServletRequestPartException(partName);
}
return arg;
}