spring无法转换“java”类型的值。lang.String“到所需类型”java。提交表单时lang.Long'错误

Question

我在控制器中有一个：

@RequestMapping(
            value = "/update",
            params = {"new_profile_image"},
            method = RequestMethod.POST)
    public ModelAndView updateUserProfileImage(
            @RequestParam(value = "new_profile_image") CommonsMultipartFile newProfileImage,
            ModelMap model) {

        System.out.println("controller executed!");

        if(newProfileImage != null && !newProfileImage.isEmpty()) {
            updateService.updateUserProfileImage(newProfileImage.getBytes());
        }

        return new ModelAndView("redirect:/users/my_profile");
    }

在jsp文件中：

<form action="<c:url value='/users/update?${_csrf.parameterName}=${_csrf.token}' />" method="post"  enctype="multipart/form-data">
    <input name="new_profile_image" type="file" id="new_profile_image">

    <button type="submit" class="btn btn-primary">Update</button>
</form>

当我提交一张图片时，我得到了

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sat Feb 08 19:08:10 CST 2020 There was an unexpected error (type=Bad Request, status=400). Failed to convert value of type 'java.lang.String' to required type 'java.lang.Long'; nested exception is java.lang.NumberFormatException: For input string: "update"

字符串"controller executed!"永远不会出现在控制台中。我在RequestMapping注释中将value = "/update"更改为value = "/updateImage"，将action="<c:url value='/users/update?${_csrf.parameterName}=${_csrf.token}' />"更改为action="<c:url value='/users/updateImage?${_csrf.parameterName}=${_csrf.token}' />"，错误消息更改为nested exception is java.lang.NumberFormatException: For input string: "updateImage"

我不知道出了什么问题，在eclipse的控制台中也没有显示异常

编辑： 我忘了说控制器在类级别有RequestMapping("/users")

现在我在控制器value = "/update"中更改了value = "/updateImage"，但我在jsp页面中保留了action="<c:url value='/users/update?${_csrf.parameterName}=${_csrf.token}' />"，错误仍然是：

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sat Feb 08 19:08:10 CST 2020 There was an unexpected error (type=Bad Request, status=400). Failed to convert value of type 'java.lang.String' to required type 'java.lang.Long'; nested exception is java.lang.NumberFormatException: For input string: "update"

我猜请求甚至没有到达控制器

Answer 1

最后，我通过从@RequestMapping中删除params属性来解决这个问题。因此，控制器最终为：

    @RequestMapping(
            value = "/updateImage",
            method = RequestMethod.POST)
    public ModelAndView updateUserProfileImage(
            @RequestParam(value = "new_profile_image", required = true) CommonsMultipartFile newProfileImage,
            ModelMap model) {

        System.out.println("controller executed!");

        if(newProfileImage != null && !newProfileImage.isEmpty()) {
            updateService.updateUserProfileImage(newProfileImage.getBytes());
        }

        return new ModelAndView("redirect:/users/my_profile");
    }

我在其他方法中将params属性与post请求一起使用，它可以工作，我想这里的问题与请求是多部分请求有关。但我真的不知道实际的问题是什么