Java Spring: Content type ‘multipart/form-data;boundary ;charset=UTF-8’ not supported

javamultipartform-dataspring

I have created a controller:

@RequestMapping(value = "/photo/" , method = RequestMethod.POST)
public @ResponseBody
void addPhotoData(@RequestBody Photo photo, @RequestParam("data")
        MultipartFile photoData) {

    InputStream in = null;
    try {
        in = photoData.getInputStream();
        photoService.save(photo, in);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

and I send the request with Postman:

I cannot understand why I receive the error 415 not supported.
Help!

Best Answer

Try wrapping the request body into an object.

 public class Payload {
   private String name;
   private String url;
   private MultipartFile data;
...
}

Add consumes = { "multipart/form-data" } and

@RequestMapping(value = "/photo/" , method = RequestMethod.POST, consumes = { "multipart/form-data" })
public @ResponseBody void addPhotoData(@ModelAttribute Payload payload) {
...

}

There is also MediaType.MULTIPART_FORM_DATA_VALUE constant instead of using that string

Related Solutions

Html – What does enctype=’multipart/form-data’ mean

When you make a POST request, you have to encode the data that forms the body of the request in some way.

HTML forms provide three methods of encoding.

application/x-www-form-urlencoded (the default)
multipart/form-data
text/plain

Work was being done on adding application/json, but that has been abandoned.

(Other encodings are possible with HTTP requests generated using other means than an HTML form submission. JSON is a common format for use with web services and some still use SOAP.)

The specifics of the formats don't matter to most developers. The important points are:

Never use text/plain.

When you are writing client-side code:

use multipart/form-data when your form includes any <input type="file"> elements
otherwise you can use multipart/form-data or application/x-www-form-urlencoded but application/x-www-form-urlencoded will be more efficient

When you are writing server-side code:

Use a prewritten form handling library

Most (such as Perl's CGI->param or the one exposed by PHP's $_POST superglobal) will take care of the differences for you. Don't bother trying to parse the raw input received by the server.

Sometimes you will find a library that can't handle both formats. Node.js's most popular library for handling form data is body-parser which cannot handle multipart requests (but has documentation that recommends some alternatives which can).

If you are writing (or debugging) a library for parsing or generating the raw data, then you need to start worrying about the format. You might also want to know about it for interest's sake.

application/x-www-form-urlencoded is more or less the same as a query string on the end of the URL.

multipart/form-data is significantly more complicated but it allows entire files to be included in the data. An example of the result can be found in the HTML 4 specification.

text/plain is introduced by HTML 5 and is useful only for debugging — from the spec: They are not reliably interpretable by computer — and I'd argue that the others combined with tools (like the Network Panel in the developer tools of most browsers) are better for that).

Java – Content type ‘multipart/form-data;boundary=—-…;charset=UTF-8’ not supported

As said dknight @RequestBody means use of JSON or XML data with maps your DTO bean. In case of MultipartFile you can't use JSON data so you can't use @RequestBody. Try with @ModelAttribute annotation.

Working sample :

@PostMapping("/promoters")
@Timed
public ResponseEntity<PromoterDTO> createPromoter(@ModelAttribute PromoterDTO promoterDTO) throws URISyntaxException { ... }

With PromoterDTO like this :

    public class PromoterDTO implements Serializable {

        private Long id; 

        private String name;

        private String address;

        private MultipartFile logo;
    }

Best Answer

Related Solutions

Html – What does enctype=’multipart/form-data’ mean

Java – Content type ‘multipart/form-data;boundary=—-…;charset=UTF-8’ not supported

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