多部分表单请求抛出：所需的 MultipartFile 参数“图像”不存在

Question

我尝试使用邮递员将图像上传到服务器。我正在使用spring制作其余的api如下：

  @RequestMapping(value = "/uploadPrescription", method =RequestMethod.POST)
  public  ResponseEntity<ResponseSuccessData> uploadPatientPrescription(
        @RequestBody  @RequestParam("image") MultipartFile image)
        throws  IOException {

但是它会抛出一个错误：

      org.springframework.web.bind.MissingServletRequestParameterException: 
      Required MultipartFile parameter 'image' is not present

正如你在邮递员中看到的那样，键名是'image'，而在rest api中也是@RequestParam("image")。

在内容类型中设置值 - Content-type = multipart/form-data,boundaries='--abc'

这是我的多部分弹簧配置 -

  @Bean
  public CommonsMultipartResolver multipartResolver() {

  CommonsMultipartResolver commonsMultipartResolver = new      CommonsMultipartResolver();
//commonsMultipartResolver.setMaxUploadSize(-1);
return commonsMultipartResolver;

}

可能是什么问题？

Answer 1

@RestController
public class UserOfferController {

// upload image 
    @RequestMapping(value = "/uploadimage", method = RequestMethod.POST)
    public ResponseEntity<ResponseObjectBean> uploadFile(@RequestParam("uploadedFile") MultipartFile file) {
        int statusCode;
        String msg;
        Object data = null;
        long maxsize = configuredValue.getFileMaxAcceptedSize();

        if (!file.isEmpty()) {

                String name = file.getOriginalFilename();

                String imagePath = "path to save your image ";


                try {
                    byte[] bytes = file.getBytes();
                    BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(new File(imagePath)));
                    stream.write(bytes);
                    statusCode = 200;
                    msg = "DONE";
                    data = true;

                }  catch (Exception e) {
                    e.printStackTrace();
                    statusCode = 500;
                    msg = "FAIL";
                    data = false;

                }

        } else {
            statusCode = 500;
            msg = "FAIL";
            data = false;
        }
        responseData.setStatusCode(statusCode);
        responseData.setStatusMsg(msg);
        responseData.setData(data);
        return new ResponseEntity<ResponseObjectBean>(responseData, HttpStatus.OK);
    }

    }

在 spring.xml 中添加这些行

    <!-- mutipart upload configuration -->
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- max upload size in bytes -->
        <property name="maxUploadSize" value="1024" />
        <!-- max size of file in memory (in bytes) -->
        <property name="maxInMemorySize" value="2048" />
    </bean>

Answer 2

除了 Abhijit Chowdhury 的回答之外，如果您仍然使用 spring security，您可以删除 Content-Type 并将您的令牌保留在标头中，无需从标头中删除所有内容。

另外，重启邮递员也很重要。

Answer 3

1.删除POSTMAN中的header部分。

2.在您的 API 中：

@RequestMapping(value = "/uploadPrescription", method =RequestMethod.POST)
      public  ResponseEntity<ResponseSuccessData> uploadPatientPrescription(
            @RequestBody  @RequestParam("image") MultipartFile image)
            throws  IOException {}

添加以下内容：

consumes = MediaType.MULTIPART_FORM_DATA_VALUE

这样就变成了：

@RequestMapping(value = "/uploadPrescription", method =RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
  public  ResponseEntity<ResponseSuccessData> uploadPatientPrescription(
        @RequestBody  @RequestParam("image") MultipartFile image)
        throws  IOException {}

Answer 4

请删除标题部分

请删除 postman 标头部分的 - Content-Type : multipart/form-data;boundary='abc' 设置

Answer 5

将 @RequestBody @RequestParam("image") 替换为 @RequestBody("image")。 第一条语句无效，请参阅 - Spring uploading files。