java - 如何发送 MultipartFile 的空值

Question

我正在使用 angularJs 和 spring 4.0，

我的 Controller 代码:

@RequestMapping(value = "/endpoint/add", method = RequestMethod.POST)
public @ResponseBody GenericFormResponse execute(
    WebRequest wreq,
    @RequestParam("epName") String epName,
    @RequestParam("ipAddr") String ipAddr,
    @RequestParam("useDefault") String useDefault,
    @RequestParam("certFile") MultipartFile certFile) throws Exception {
    .....................
}

我的js(angualrJs)代码:

var formData = new FormData();
formData.append("epName", $scope.epName);
formData.append("ipAddr", $scope.ipAddr);
formData.append("useDefault",$scope.defaultCert);
if(!$scope.defaultCert){
    formData.append("certFile", upFile);
}
$http({
    method: "POST",
    url: "./service/endpoint/add",
    data: formData,
    transformRequest: angular.identity,
    headers: {'Content-Type': undefined }
}).success(svcSuccessHandler)
  .error(svcErrorHandler);

我的问题是 $scope.defaultCert=false POST 请求工作正常，$scope.defaultCert = true 我收到错误请求(400 )。

我也尝试了下面的事情，

if(!$scope.defaultCert){
    formData.append("certFile", upFile);
}else{
    formData.append("certFile", null);
}

我如何发送空的MultipartFile。谢谢。

Answer 1

我在 Controller 中创建了两个服务，并为这两个服务创建了两个 url

@RequestMapping(value = "/endpoint/add-with-cert", method = RequestMethod.POST)
public @ResponseBody GenericFormResponse excecuteWithCert(
        WebRequest wreq,
        @RequestParam("epName") String epName,
        @RequestParam("ipAddr") String ipAddr,
        @RequestParam("useDefault") boolean useDefault,
        @RequestParam("certFile") MultipartFile certFile) throws Exception {
    LOGGER.debug("received request for endpoint creation with certificate");
    GenericFormResponse response = new GenericFormResponse();
    SessionManager sessionMgr = new SessionManager(wreq);
    if(!sessionMgr.isLoggedIn()) {
        response.setSuccess(false);
        response.setGlobalErrorCode("not_logged_in");
        return response;
    }
    ...............
}

@RequestMapping(value = "/endpoint/add", method = RequestMethod.POST)
public @ResponseBody GenericFormResponse excecuteWithOutCert(
        WebRequest wreq,
        @RequestParam("epName") String epName,
        @RequestParam("ipAddr") String ipAddr,
        @RequestParam("useDefault") boolean useDefault) throws Exception {
    LOGGER.debug("received request for endpoint creation  without certificate");
    ...............
}

在js文件中:

var url = "./service/endpoint/add";
if(!$scope.defaultCert){
    formData.append("certFile", upFile);
    url = "./service/endpoint/add-with-cert";
}       
$http({
method: "POST",
    url: url,
    data: formData,
    transformRequest: angular.identity, headers: {'Content-Type': undefined }
}).success(svcSuccessHandler)
.error(svcErrorHandler);

我不知道这个方法是否正确，但它满足了我的要求。按我的预期工作。请提出最佳答案。