import org.apache.struts.action.ActionServletWrapper; //导入依赖的package包/类
public static void getMultipartParameters(HttpServletRequest request, ActionServletWrapper servletWrapper,
		ActionForm form, ActionMapping mapping) {
	Map params = new HashMap();

	// Get the ActionServletWrapper from the form bean
	// ActionServletWrapper servletWrapper = getServletWrapper();

	try {
		CommonsMultipartRequestHandler multipartHandler = new CommonsMultipartRequestHandler();
		if (multipartHandler != null) {
			// Set servlet and mapping info
			if (servletWrapper != null) {
				// from pojoformbase
				// servlet only affects tempdir on local disk
				servletWrapper.setServletFor(multipartHandler);
			}
			multipartHandler.setMapping((ActionMapping) request.getAttribute(Globals.MAPPING_KEY));
			// Initialize multipart request class handler
			multipartHandler.handleRequest(request);

			Collection<FormFile> files = multipartHandler.getFileElements().values();
			Enumeration keys = multipartHandler.getFileElements().keys();

			while (keys.hasMoreElements()) {
				Object key = keys.nextElement();
				FormFile file = (FormFile) multipartHandler.getFileElements().get(key);
				long maxSize = WebUtils.getMaxUploadSize(form);
				if (LOG.isDebugEnabled()) {
					LOG.debug(file.getFileSize());
				}
				if (maxSize > 0 && Long.parseLong(file.getFileSize() + "") > maxSize) {

					GlobalVariables.getMessageMap().putError(key.toString(),
							RiceKeyConstants.ERROR_UPLOADFILE_SIZE,
							new String[] { file.getFileName(), Long.toString(maxSize) });

				}
			}

			// get file elements for kualirequestprocessor
			if (servletWrapper == null) {
				request.setAttribute(KRADConstants.UPLOADED_FILE_REQUEST_ATTRIBUTE_KEY,
						getFileParametersForMultipartRequest(request, multipartHandler));
			}
		}
	}
	catch (ServletException e) {
		throw new ValidationException("unable to handle multipart request " + e.getMessage(), e);
	}
}