我正在嘗試為包含以下方法的 Controller 類編寫 Junit 測試。 @RequestMapping(value = "/mappingUrl", method = RequestMethod.POST)public String uploadFileMethod(HttpServletResponse httpResponse, HttpServletRequest httpRequest, ModelMap model) throws Exception {  try {    MultipartFile multipartFile = ((MultipartHttpServletRequest) httpRequest).getFile("fileName");   }  catch(Exception e){}}在測試類中，我有以下方法 @Testpublic void testUploadFileMethod() throws Exception {mockMVC.perform(post("/mappingUrl")).andExpect(status().isOk());}執(zhí)行測試時出現(xiàn)以下異常：java.lang.ClassCastException: org.springframework.mock.web.MockHttpServletRequest cannot be cast to org.springframework.web.multipart.MultipartHttpServletRequest有沒有一種方法可以在不更改現(xiàn)有代碼的情況下測試該方法？該類在整個應(yīng)用程序中使用，我擔(dān)心我可能會破壞其他東西。