Java Code Examples for org.springframework.web.multipart.MultipartHttpServletRequest#getFiles()

@Override
protected Object resolveName(String name, MethodParameter parameter, NativeWebRequest request) throws Exception {
	HttpServletRequest servletRequest = request.getNativeRequest(HttpServletRequest.class);
	MultipartHttpServletRequest multipartRequest =
			WebUtils.getNativeRequest(servletRequest, MultipartHttpServletRequest.class);

	Object mpArg = MultipartResolutionDelegate.resolveMultipartArgument(name, parameter, servletRequest);
	if (mpArg != MultipartResolutionDelegate.UNRESOLVABLE) {
		return mpArg;
	}

	Object arg = null;
	if (multipartRequest != null) {
		List<MultipartFile> files = multipartRequest.getFiles(name);
		if (!files.isEmpty()) {
			arg = (files.size() == 1 ? files.get(0) : files);
		}
	}
	if (arg == null) {
		String[] paramValues = request.getParameterValues(name);
		if (paramValues != null) {
			arg = (paramValues.length == 1 ? paramValues[0] : paramValues);
		}
	}
	return arg;
}
 

/**
 * SpringMVC 上传图片文件，配置允许上传的文件后缀再 systemConfig.xml 的OSS节点
 * @param filePath 上传后的文件所在OSS的目录、路径，如 "jar/file/"
 * @param request SpringMVC接收的 {@link MultipartFile},若是有上传图片文件，会自动转化为{@link MultipartFile}保存
 * @param formFileName form表单上传的单个图片文件，表单里上传文件的文件名
 * @param maxWidth 上传图片的最大宽度，若超过这个宽度，会对图片进行等比缩放为当前宽度。
 * @return {@link UploadFileVO} 若成功，则上传了文件并且上传成功
 */
public static UploadFileVO uploadImage(String filePath,HttpServletRequest request,String formFileName, int maxWidth) {
	UploadFileVO uploadFileVO = new UploadFileVO();
	if (request instanceof MultipartHttpServletRequest) {
		MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
		List<MultipartFile> imageList = multipartRequest.getFiles(formFileName);  
		if(imageList.size()>0 && !imageList.get(0).isEmpty()){
			MultipartFile multi = imageList.get(0);
			uploadFileVO = uploadImageByMultipartFile(filePath, multi, maxWidth);
		}else{
			uploadFileVO.setResult(UploadFileVO.NOTFILE);
			uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
		}
    }else{
    	uploadFileVO.setResult(UploadFileVO.NOTFILE);
		uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
    }
	return uploadFileVO;
}
 

/**
 * SpringMVC 上传单个图片文件，配置允许上传的文件后缀再 systemConfig.xml 的OSS节点
 * @param filePath 上传后的文件所在OSS的目录、路径，如 "jar/file/"
 * @param request SpringMVC接收的 {@link MultipartFile},若是有上传图片文件，会自动转化为{@link MultipartFile}保存
 * @param formFileName form表单上传的单个图片文件，表单里上传文件的文件名
 * @return {@link UploadFileVO} 若成功，则上传了文件并且上传成功
 */
public static UploadFileVO uploadImageByRequest(String filePath, HttpServletRequest request, String formFileName) {
	UploadFileVO uploadFileVO = new UploadFileVO();
	if (request instanceof MultipartHttpServletRequest) {
		MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
		List<MultipartFile> imageList = multipartRequest.getFiles(formFileName);  
		
		if(imageList.size()>0 && !imageList.get(0).isEmpty()){
			uploadFileVO = uploadImageByMultipartFile(filePath, imageList.get(0));
		}else{
			uploadFileVO.setResult(UploadFileVO.NOTFILE);
			uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
		}
    }else{
    	uploadFileVO.setResult(UploadFileVO.NOTFILE);
		uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
    }
	return uploadFileVO;
}
 

/**
 * SpringMVC 上传单个图片文件，配置允许上传的文件后缀再 systemConfig.xml 的OSS节点
 * <br/> 建议使用 uploadImageByRequest
 * @param filePath 上传后的文件所在OSS的目录、路径，如 "jar/file/"
 * @param request SpringMVC接收的 {@link MultipartFile},若是有上传图片文件，会自动转化为{@link MultipartFile}保存
 * @param formFileName form表单上传的单个图片文件，表单里上传文件的文件名
 * @return {@link UploadFileVO} 若成功，则上传了文件并且上传成功
 * @deprecated
 */
public static UploadFileVO uploadImage(String filePath, HttpServletRequest request, String formFileName) {
	UploadFileVO uploadFileVO = new UploadFileVO();
	if (request instanceof MultipartHttpServletRequest) {
		MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
		List<MultipartFile> imageList = multipartRequest.getFiles(formFileName);  
		
		if(imageList.size()>0 && !imageList.get(0).isEmpty()){
			uploadFileVO = uploadImageByMultipartFile(filePath, imageList.get(0));
		}else{
			uploadFileVO.setResult(UploadFileVO.NOTFILE);
			uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
		}
    }else{
    	uploadFileVO.setResult(UploadFileVO.NOTFILE);
		uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
    }
	return uploadFileVO;
}
 

/**
 * SpringMVC 上传图片文件，配置允许上传的文件后缀再 systemConfig.xml 的AttachmentFile节点
 * @param filePath 上传后的文件所在的目录、路径，如 "jar/file/"
 * @param request SpringMVC接收的 {@link MultipartFile},若是有上传图片文件，会自动转化为{@link MultipartFile}保存
 * @param formFileName form表单上传的单个图片文件，表单里上传文件的文件名
 * @param maxWidth 上传图片的最大宽度，若超过这个宽度，会对图片进行等比缩放为当前宽度。
 * @return {@link UploadFileVO} 若成功，则上传了文件并且上传成功
 */
public static UploadFileVO uploadImage(String filePath,HttpServletRequest request,String formFileName, int maxWidth) {
	UploadFileVO uploadFileVO = new UploadFileVO();
	if (request instanceof MultipartHttpServletRequest) {
		MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
		List<MultipartFile> imageList = multipartRequest.getFiles(formFileName);  
		if(imageList.size()>0 && !imageList.get(0).isEmpty()){
			MultipartFile multi = imageList.get(0);
			uploadFileVO = uploadImageByMultipartFile(filePath, multi, maxWidth);
		}else{
			uploadFileVO.setResult(UploadFileVO.NOTFILE);
			uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
		}
    }else{
    	uploadFileVO.setResult(UploadFileVO.NOTFILE);
		uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
    }
	return uploadFileVO;
}
 

/**
 * SpringMVC 上传文件，配置允许上传的文件后缀再 systemConfig.xml 的AttachmentFile节点
 * @param filePath 上传后的文件所在的目录、路径，如 "jar/file/"
 * @param request SpringMVC接收的 {@link MultipartFile},若是有上传文件，会自动转化为{@link MultipartFile}保存
 * @param formFileName form表单上传的单个文件，表单里上传文件的文件名
 * @return {@link UploadFileVO} 若成功，则上传了文件并且上传成功
 */
public static UploadFileVO uploadFile(String filePath,HttpServletRequest request,String formFileName) {
	UploadFileVO uploadFileVO = new UploadFileVO();
	if (request instanceof MultipartHttpServletRequest) {
		MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
		List<MultipartFile> list = multipartRequest.getFiles(formFileName);  
		if(list.size()>0 && !list.get(0).isEmpty()){
			MultipartFile multi = list.get(0);
			uploadFileVO = uploadFileByMultipartFile(filePath, multi);
		}else{
			uploadFileVO.setResult(UploadFileVO.NOTFILE);
			uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
		}
    }else{
    	uploadFileVO.setResult(UploadFileVO.NOTFILE);
		uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
    }
	return uploadFileVO;
}
 

@Override
public List<OptUploadFileRespDto> uploadFile(MultipartHttpServletRequest multipartRequest, OptUploadFileReqDto optUploadFileReqDto, LoginAuthDto loginAuthDto, boolean storeDbFlag) {
	String fileType = optUploadFileReqDto.getFileType();
	String filePath = optUploadFileReqDto.getFilePath();
	String bucketName = optUploadFileReqDto.getBucketName();
	List<OptUploadFileRespDto> result = Lists.newArrayList();
	if (PublicUtil.isEmpty(filePath)) {
		filePath = GlobalConstant.Sys.DEFAULT_FILE_PATH;
	}
	try {
		List<MultipartFile> fileList = multipartRequest.getFiles("file");
		if (fileList.isEmpty()) {
			return result;
		}

		for (MultipartFile multipartFile : fileList) {
			String fileName = multipartFile.getOriginalFilename();
			if (PublicUtil.isEmpty(fileName)) {
				continue;
			}
			Preconditions.checkArgument(multipartFile.getSize() <= GlobalConstant.FILE_MAX_SIZE, "上传文件不能大于5M");
			InputStream inputStream = multipartFile.getInputStream();

			String inputStreamFileType = FileTypeUtil.getType(inputStream);
			CheckFileUtil.checkFileType(fileType, inputStreamFileType);
			OptUploadFileRespDto fileInfo;
			if (storeDbFlag) {
				fileInfo = this.uploadFile(multipartFile.getBytes(), fileName, fileType, filePath, bucketName, loginAuthDto);
			} else {
				fileInfo = optOssService.uploadFile(multipartFile.getBytes(), fileName, filePath, bucketName);
			}
			result.add(fileInfo);
		}
	} catch (IOException e) {
		logger.error("上传文件失败={}", e.getMessage(), e);
	}
	return result;
}
 

@Nullable
public static Object resolveMultipartArgument(String name, MethodParameter parameter, HttpServletRequest request)
		throws Exception {

	MultipartHttpServletRequest multipartRequest =
			WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
	boolean isMultipart = (multipartRequest != null || isMultipartContent(request));

	if (MultipartFile.class == parameter.getNestedParameterType()) {
		if (multipartRequest == null && isMultipart) {
			multipartRequest = new StandardMultipartHttpServletRequest(request);
		}
		return (multipartRequest != null ? multipartRequest.getFile(name) : null);
	}
	else if (isMultipartFileCollection(parameter)) {
		if (multipartRequest == null && isMultipart) {
			multipartRequest = new StandardMultipartHttpServletRequest(request);
		}
		return (multipartRequest != null ? multipartRequest.getFiles(name) : null);
	}
	else if (isMultipartFileArray(parameter)) {
		if (multipartRequest == null && isMultipart) {
			multipartRequest = new StandardMultipartHttpServletRequest(request);
		}
		if (multipartRequest != null) {
			List<MultipartFile> multipartFiles = multipartRequest.getFiles(name);
			return multipartFiles.toArray(new MultipartFile[0]);
		}
		else {
			return null;
		}
	}
	else if (Part.class == parameter.getNestedParameterType()) {
		return (isMultipart ? request.getPart(name): null);
	}
	else if (isPartCollection(parameter)) {
		return (isMultipart ? resolvePartList(request, name) : null);
	}
	else if (isPartArray(parameter)) {
		return (isMultipart ? resolvePartList(request, name).toArray(new Part[0]) : null);
	}
	else {
		return UNRESOLVABLE;
	}
}
 

@Nullable
public static Object resolveMultipartArgument(String name, MethodParameter parameter, HttpServletRequest request)
		throws Exception {

	MultipartHttpServletRequest multipartRequest =
			WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
	boolean isMultipart = (multipartRequest != null || isMultipartContent(request));

	if (MultipartFile.class == parameter.getNestedParameterType()) {
		if (multipartRequest == null && isMultipart) {
			multipartRequest = new StandardMultipartHttpServletRequest(request);
		}
		return (multipartRequest != null ? multipartRequest.getFile(name) : null);
	}
	else if (isMultipartFileCollection(parameter)) {
		if (multipartRequest == null && isMultipart) {
			multipartRequest = new StandardMultipartHttpServletRequest(request);
		}
		return (multipartRequest != null ? multipartRequest.getFiles(name) : null);
	}
	else if (isMultipartFileArray(parameter)) {
		if (multipartRequest == null && isMultipart) {
			multipartRequest = new StandardMultipartHttpServletRequest(request);
		}
		if (multipartRequest != null) {
			List<MultipartFile> multipartFiles = multipartRequest.getFiles(name);
			return multipartFiles.toArray(new MultipartFile[0]);
		}
		else {
			return null;
		}
	}
	else if (Part.class == parameter.getNestedParameterType()) {
		return (isMultipart ? request.getPart(name): null);
	}
	else if (isPartCollection(parameter)) {
		return (isMultipart ? resolvePartList(request, name) : null);
	}
	else if (isPartArray(parameter)) {
		return (isMultipart ? resolvePartList(request, name).toArray(new Part[0]) : null);
	}
	else {
		return UNRESOLVABLE;
	}
}
 

/**
 * 模板管理 添加
 */
@RequestMapping(params="method=add", method=RequestMethod.POST)
public String add(ModelMap model,Templates formbean,BindingResult result, 
		MultipartHttpServletRequest request, HttpServletResponse response)throws Exception {
	
	//数据校验
	this.validator.validate(formbean, result); 
	
	Templates templates = new Templates();
	templates.setName(formbean.getName().trim());
	templates.setDirName(formbean.getDirName().trim());
	templates.setIntroduction(formbean.getIntroduction());
	
	
	if (!result.hasErrors()) {  
		//图片上传
		List<MultipartFile> files = request.getFiles("uploadImage"); 
		for(MultipartFile file : files) {
			if(!file.isEmpty()){	
				//验证文件类型
				List<String> formatList = new ArrayList<String>();
				formatList.add("gif");
				formatList.add("jpg");
				formatList.add("jpeg");
				formatList.add("bmp");
				formatList.add("png");
				boolean authentication = FileUtil.validateFileSuffix(file.getOriginalFilename(),formatList);
				if(authentication){
					//取得文件后缀		
					String ext = FileUtil.getExtension(file.getOriginalFilename());
					//文件保存目录
					String pathDir = "common"+File.separator+formbean.getDirName()+File.separator;
					//构建文件名称
					String fileName = "templates." + ext;
					templates.setThumbnailSuffix(ext);
					
					//生成文件保存目录
					FileUtil.createFolder(pathDir);
					//保存文件
					localFileManage.writeFile(pathDir, fileName,file.getBytes());
			   }else{
				   result.rejectValue("thumbnailSuffix","errors.required", new String[]{"图片格式错误"},"");
			   }
			}
			
			break;//只有一个文件上传框
		}
	}

	if (result.hasErrors()) {  
		return "jsp/template/add_templates";
	} 
	
	
	
	List<Layout> layoutList = templateManage.newTemplate(templates.getDirName());
	templateService.saveTemplate(templates,layoutList);
	
	model.addAttribute("message","添加模板成功");//返回消息
	model.addAttribute("urladdress", RedirectPath.readUrl("control.template.list"));//返回消息//返回转向地址
	return "jsp/common/message";
}
 

public static Object resolveMultipartArgument(String name, MethodParameter parameter, HttpServletRequest request)
		throws Exception {

	MultipartHttpServletRequest multipartRequest =
			WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
	boolean isMultipart = (multipartRequest != null || isMultipartContent(request));

	if (MultipartFile.class == parameter.getNestedParameterType()) {
		if (multipartRequest == null && isMultipart) {
			multipartRequest = adaptToMultipartHttpServletRequest(request);
		}
		return (multipartRequest != null ? multipartRequest.getFile(name) : null);
	}
	else if (isMultipartFileCollection(parameter)) {
		if (multipartRequest == null && isMultipart) {
			multipartRequest = adaptToMultipartHttpServletRequest(request);
		}
		return (multipartRequest != null ? multipartRequest.getFiles(name) : null);
	}
	else if (isMultipartFileArray(parameter)) {
		if (multipartRequest == null && isMultipart) {
			multipartRequest = adaptToMultipartHttpServletRequest(request);
		}
		if (multipartRequest != null) {
			List<MultipartFile> multipartFiles = multipartRequest.getFiles(name);
			return multipartFiles.toArray(new MultipartFile[multipartFiles.size()]);
		}
		else {
			return null;
		}
	}
	else if (servletPartClass != null) {
		if (servletPartClass == parameter.getNestedParameterType()) {
			return (isMultipart ? RequestPartResolver.resolvePart(request, name) : null);
		}
		else if (isPartCollection(parameter)) {
			return (isMultipart ? RequestPartResolver.resolvePartList(request, name) : null);
		}
		else if (isPartArray(parameter)) {
			return (isMultipart ? RequestPartResolver.resolvePartArray(request, name) : null);
		}
	}
	return UNRESOLVABLE;
}
 

/**
 * 上传preview.jpg图片接口
 */
@RequestMapping(value="uploadPreview${url.suffix}", method = RequestMethod.POST)
@ResponseBody
public UploadFileVO uploadPreview(Model model,HttpServletRequest request){
	UploadFileVO uploadFileVO = new UploadFileVO();
	if(!haveSiteAuth()){
		uploadFileVO.setBaseVO(UploadFileVO.FAILURE, "无权操作");
		return uploadFileVO;
	}
	if(!clientCheck(request)){
		uploadFileVO.setBaseVO(UploadFileVO.FAILURE, "模版开发仅限本地运行使用！");
		return uploadFileVO;
	}
	
	Site site = getSite();
	
	//判断一下对方使用的是OSS还是本地存储，如果没用本地存储，提醒用户要使用本地存储的
	if(!AttachmentFile.isMode(AttachmentFile.MODE_LOCAL_FILE)){
		uploadFileVO.setBaseVO(UploadFileVO.FAILURE, "存储方式请使用服务器本地存储。请按照我们的说明，使用本地一键运行包进行模版开发！");
		return uploadFileVO;
	}
	
	
	if (request instanceof MultipartHttpServletRequest) {
		MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
		List<MultipartFile> imageList = multipartRequest.getFiles("image");  
		if(imageList.size()>0 && !imageList.get(0).isEmpty()){
			MultipartFile multi = imageList.get(0);
			try {
				uploadFileVO = AttachmentFile.put(getExportPath()+site.getTemplateName()+"/preview.jpg", multi.getInputStream());
			} catch (IOException e) {
				e.printStackTrace();
			}
		}else{
			uploadFileVO.setResult(UploadFileVO.NOTFILE);
			uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
		}
    }else{
    	uploadFileVO.setResult(UploadFileVO.NOTFILE);
		uploadFileVO.setInfo(Language.show("oss_uploadNotFile"));
    }
	
	
	if(uploadFileVO.getResult() == UploadFileVO.SUCCESS){
		//上传成功，写日志
		AliyunLog.addActionLog(getSiteId(), "模版开发，上传preview.jpg："+uploadFileVO.getUrl());
	}
	
	return uploadFileVO;
}
 

public UploadFileVO updateHeadByOSS(HttpServletRequest request,
		String formFileName, int maxWidth) {
	UploadFileVO uploadFileVO = new UploadFileVO();
	MultipartFile multipartFile = null;
	if (request instanceof MultipartHttpServletRequest) {
		MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
		List<MultipartFile> imageList = multipartRequest.getFiles(formFileName);  
		if(imageList.size() == 0){
			Log.debug("上传头像时，未发现头像 ------"+Language.show("user_uploadHeadImageNotFind"));
			uploadFileVO.setResult(UploadFileVO.NOTFILE);
			uploadFileVO.setInfo(Language.show("user_uploadHeadImageNotFind"));
			return uploadFileVO;
		}else{
			Log.debug("上传头像，已发现头像的multipartFile");
			multipartFile = imageList.get(0);
		}
    }
	
	if(multipartFile == null || multipartFile.isEmpty()){
		uploadFileVO.setBaseVO(BaseVO.FAILURE, Language.show("user_uploadHeadImageNotFind"));
		Log.debug("上传头像的multipartFile为空，不存在上传的头像 ------"+Language.show("user_uploadHeadImageNotFind"));
		return uploadFileVO;
	}
	
	User user = ShiroFunc.getUser();
	uploadFileVO = OSS.uploadImageByMultipartFile(Global.get("USER_HEAD_PATH"), multipartFile, maxWidth);
	if(uploadFileVO.getResult() - UploadFileVO.FAILURE == 0){
		return uploadFileVO;
	}
	
	User u = sqlDAO.findById(User.class, user.getId());
	//删除之前的头像
	if(u.getHead() != null && u.getHead().length() > 0 && !u.getHead().equals("default.png")){
		AttachmentFile.deleteObject(Global.get("USER_HEAD_PATH")+u.getHead());
	}
	
	u.setHead(uploadFileVO.getFileName());
	sqlDAO.save(u);
	ShiroFunc.getUser().setHead(uploadFileVO.getFileName());
	
	return uploadFileVO;
}
 

@Override
@UsesJava8
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);

	Class<?> paramType = parameter.getParameterType();
	boolean optional = paramType.getName().equals("java.util.Optional");
	if (optional) {
		parameter.increaseNestingLevel();
		paramType = parameter.getNestedParameterType();
	}

	String partName = getPartName(parameter);
	Object arg;

	if (MultipartFile.class == paramType) {
		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(paramType.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.getNestedGenericParameterType());
			WebDataBinder binder = binderFactory.createBinder(request, arg, partName);
			if (arg != null) {
				validateIfApplicable(binder, parameter);
				if (binder.getBindingResult().hasErrors() && isBindExceptionRequired(binder, parameter)) {
					throw new MethodArgumentNotValidException(parameter, binder.getBindingResult());
				}
			}
			mavContainer.addAttribute(BindingResult.MODEL_KEY_PREFIX + partName, binder.getBindingResult());
		}
		catch (MissingServletRequestPartException ex) {
			// handled below
			arg = null;
		}
	}

	RequestPart requestPart = parameter.getParameterAnnotation(RequestPart.class);
	boolean isRequired = ((requestPart == null || requestPart.required()) && !optional);

	if (arg == null && isRequired) {
		throw new MissingServletRequestPartException(partName);
	}
	if (optional) {
		arg = Optional.ofNullable(arg);
	}

	return arg;
}
 

@Override
protected Object resolveName(String name, MethodParameter parameter, NativeWebRequest webRequest) throws Exception {
	HttpServletRequest servletRequest = webRequest.getNativeRequest(HttpServletRequest.class);
	MultipartHttpServletRequest multipartRequest =
			WebUtils.getNativeRequest(servletRequest, MultipartHttpServletRequest.class);
	Object arg;

	if (MultipartFile.class == parameter.getParameterType()) {
		assertIsMultipartRequest(servletRequest);
		Assert.notNull(multipartRequest, "Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
		arg = multipartRequest.getFile(name);
	}
	else if (isMultipartFileCollection(parameter)) {
		assertIsMultipartRequest(servletRequest);
		Assert.notNull(multipartRequest, "Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
		arg = multipartRequest.getFiles(name);
	}
	else if (isMultipartFileArray(parameter)) {
		assertIsMultipartRequest(servletRequest);
		Assert.notNull(multipartRequest, "Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
		List<MultipartFile> multipartFiles = multipartRequest.getFiles(name);
		arg = multipartFiles.toArray(new MultipartFile[multipartFiles.size()]);
	}
	else if ("javax.servlet.http.Part".equals(parameter.getParameterType().getName())) {
		assertIsMultipartRequest(servletRequest);
		arg = servletRequest.getPart(name);
	}
	else if (isPartCollection(parameter)) {
		assertIsMultipartRequest(servletRequest);
		arg = new ArrayList<Object>(servletRequest.getParts());
	}
	else if (isPartArray(parameter)) {
		assertIsMultipartRequest(servletRequest);
		arg = RequestPartResolver.resolvePart(servletRequest);
	}
	else {
		arg = null;
		if (multipartRequest != null) {
			List<MultipartFile> files = multipartRequest.getFiles(name);
			if (!files.isEmpty()) {
				arg = (files.size() == 1 ? files.get(0) : files);
			}
		}
		if (arg == null) {
			String[] paramValues = webRequest.getParameterValues(name);
			if (paramValues != null) {
				arg = (paramValues.length == 1 ? paramValues[0] : paramValues);
			}
		}
	}

	return arg;
}