java - 在 Spring boot 和 REST API 中上传 multipart/form-data 文件

Question

我想上传一个 .png 文件并存储该文件。当我使用 content-type=multipart/form-data 发送它时，我收到此异常

org.springframework.web.HttpMediaTypeNotSupportedException: Content type 
  'application/octet-stream' not supported . 

我认为我的应用程序不理解表单数据 contentType 并引发不相关的异常。怎么了？

    @Controller
    public class ProfileController {
        private static final Logger logger = LoggerFactory.getLogger(ProfileController.class);

        @Autowired
        ProfileService service;

        //http : http --pretty all --form PUT localhost:8080/profile/v1?thumb=glb
        @PutMapping(value = "/v1")
        public Mono<ResponseEntity<String>> upload(@RequestPart(value = "thumb", required = false) String thumbFilterName,
                                                   @RequestPart(value = "genthumb", required = false) String genthumb,
                                                   @RequestPart("hash") String hash,
                                                   @RequestPart("uploader") Long uploader,
                                                   @RequestPart("file") MultipartFile file) throws Exception {


        System.out.println(thumbFilterName);
        System.out.println(gentumb);
        System.out.println(uploader);
        System.out.println(file);
//and doing storage stuff!
return Mono.just(ResponseEntity.ok().build());
        }
    }

这是我的 Rest 客户端，用于发送文件。注意回复。

这些是restClient的屏幕截图。使用restClient发送文件:

这是设置标题

Answer 1

在uploader中，您必须将@RequestPart更改为@RequestParam

@RequestPart("uploader") Long uploader,

Javadoc explaination :

Note that @RequestParam annotation can also be used to associate the part of a "multipart/form-data" request with a method argument supporting the same method argument types. The main difference is that when the method argument is not a String, @RequestParam relies on type conversion via a registered Converter or PropertyEditor while @RequestPart relies on HttpMessageConverters taking into consideration the 'Content-Type' header of the request part. @RequestParam is likely to be used with name-value form fields while @RequestPart is likely to be used with parts containing more complex content (e.g. JSON, XML).