Multipart File upload Spring Boot

Question

Im using Spring Boot and want to use a Controller to receive a multipart file upload  When sending the file I keep getting the error 415 unsupported content type response and the controller is never reached  There was an unexpected error  type Unsupported Media Type  status 415   Content type  multipart form-data boundary ----WebKitFormBoundary1KvzQ1rt2V1BBbb8  not supported   Ive tried sending using form action in html jsp page and also in a standalone client application which uses RestTemplate   All attempts give the same result   multipart form-data boundary XXXXX not supported     It seems from multipart documentation that the boundary param has to be added to the multipart upload however this seems to not match the controller receiving  multipart form-data    My controller method is setup as follows    RequestMapping value     things   method   RequestMethod POST  consumes    multipart form-data                                         produces      application json    application xml          public ResponseEntity lt ThingRepresentation gt  submitThing HttpServletRequest request                                        PathVariable  domain   String domainParam                                        RequestParam value    type   String thingTypeParam                                        RequestBody MultipartFile   submissions  throws Exception   With Bean Setup    Bean  public MultipartConfigElement multipartConfigElement          return new MultipartConfigElement            Bean  public MultipartResolver multipartResolver          org springframework web multipart commons CommonsMultipartResolver multipartResolver   new org springframework web multipart commons CommonsMultipartResolver         multipartResolver setMaxUploadSize 1000000        return multipartResolver       As you can see I ve set the consumes type to  multipart form-data  but when the multipart is sent it must have a boundary parameter and places a random boundary string     Can anyone please tell me how I can either set the content type in controller to match or change my request to match my controller setup   My attempts to send      Attempt 1      lt html lang  en  gt   lt body gt        lt br gt       lt h2 gt Upload New File to this Bucket lt  h2 gt       lt form action  http   localhost 8280 appname domains abc things type abcdef00-1111-4b38-8026-315b13dc8706  method  post  enctype  multipart form-data  gt           lt table width  60   border  1  cellspacing  0  gt               lt tr gt                   lt td width  35   gt  lt strong gt File to upload lt  strong gt  lt  td gt                   lt td width  65   gt  lt input type  file  name  file    gt  lt  td gt               lt  tr gt               lt tr gt                   lt td gt  amp nbsp  lt  td gt                   lt td gt  lt input type  submit  name  submit  value  Add    gt  lt  td gt               lt  tr gt           lt  table gt       lt  form gt   lt  body gt   lt  html gt    Attempt 2      RestTemplate template   new RestTemplate    MultiValueMap lt String  Object gt  parts   new LinkedMultiValueMap lt String  Object gt     parts add  file   new FileSystemResource pathToFile     try       URI response   template postForLocation url  parts    catch HttpClientErrorException e       System out println e getResponseBodyAsString         Attempt 3     FormHttpMessageConverter formHttpMessageConverter   new FormHttpMessageConverter            formHttpMessageConverter setCharset Charset forName  UTF8               RestTemplate restTemplate   new RestTemplate             restTemplate getMessageConverters   add  formHttpMessageConverter            restTemplate getMessageConverters   add new MappingJackson2HttpMessageConverter             restTemplate setRequestFactory new HttpComponentsClientHttpRequestFactory              MultiValueMap lt String  Object gt  map   new LinkedMultiValueMap lt String  Object gt             map add  file   new FileSystemResource path             HttpHeaders imageHeaders   new HttpHeaders            imageHeaders setContentType MediaType MULTIPART FORM DATA            HttpEntity lt MultiValueMap lt String  Object gt  gt  imageEntity   new HttpEntity lt MultiValueMap lt String  Object gt  gt  map  imageHeaders           ResponseEntity e   restTemplate exchange uri  HttpMethod POST  imageEntity  Boolean class           System out println e toString

User · Accepted Answer

RequestBody MultipartFile   submissions   should be    RequestParam  file   MultipartFile   submissions   The files are not the request body  they are part of it and there is no built-in HttpMessageConverter that can convert the request to an array of MultiPartFile   You can also replace HttpServletRequest with MultipartHttpServletRequest  which gives you access to the headers of the individual parts

User · Answer

You can simply use a controller method like this    RequestMapping value     uploadFile   method   RequestMethod POST   ResponseBody public ResponseEntity lt   gt  uploadFile       RequestParam  file   MultipartFile file       try          Handle the received file here                  catch  Exception e        return new ResponseEntity lt  gt  HttpStatus BAD REQUEST          return new ResponseEntity lt  gt  HttpStatus OK        method uploadFile   Without any additional configurations for Spring Boot   Using the following html form client side    lt html gt   lt body gt     lt form action   uploadFile  method  POST  enctype  multipart form-data  gt       lt input type  file  name  file  gt       lt input type  submit  value  Upload  gt      lt  form gt   lt  body gt   lt  html gt    If you want to set limits on files size you can do it in the application properties     File size limit multipart maxFileSize   3Mb    Total request size for a multipart form-data multipart maxRequestSize   20Mb   Moreover to send the file with Ajax take a look here  http   blog netgloo com 2015 02 08 spring-boot-file-upload-with-ajax

User · Answer

Bean     MultipartConfigElement multipartConfigElement             MultipartConfigFactory factory   new MultipartConfigFactory            factory setMaxFileSize  5120MB            factory setMaxRequestSize  5120MB            return factory createMultipartConfig            put it in class where you are defining beans

User · Answer

In Controller  your method should be    RequestMapping value     upload   method   RequestMethod POST      public ResponseEntity lt SaveResponse gt  uploadAttachment  RequestParam  file   MultipartFile file  HttpServletRequest request           Further  you need to update application yml  or application properties  to support maximum file size and request size   spring      http          multipart              max-file-size  5MB             max-request-size  20MB

User · Answer

RequestMapping value   add image   method RequestMethod POST  public ResponseEntity upload  RequestParam  id   Long id  HttpServletResponse response  HttpServletRequest request           try           MultipartHttpServletRequest multipartRequest  MultipartHttpServletRequest request          Iterator lt String gt  it multipartRequest getFileNames            MultipartFile multipart multipartRequest getFile it next             String fileName id   png           String imageName   fileName           byte   bytes multipart getBytes            BufferedOutputStream stream  new BufferedOutputStream new FileOutputStream  src main resources static image book   fileName              stream write bytes           stream close            return new ResponseEntity  upload success   HttpStatus OK          catch  Exception e            e printStackTrace            return new ResponseEntity  Upload fialed   HttpStatus BAD REQUEST

User · Answer

Latest version of SpringBoot makes uploading multiple files very easy also  On the browser side you just need the standard HTML upload form  but with multiple input elements  one per file to upload  which is very important   all having the same element name  name  files  for the example below   Then in your Spring  Controller class on the server all you need is something like this    RequestMapping value     upload   method   RequestMethod POST      public  ResponseBody ResponseEntity lt   gt  upload           RequestParam  files   MultipartFile   uploadFiles  throws Exception               now loop over all uploadFiles in the array and do what you want   return new ResponseEntity lt  gt  HttpStatus OK       Those are the tricky parts  That is  knowing to create multiple input elements each named  files   and knowing to use a MultipartFile    array  as the request parameter are the tricky things to know  but it s just that simple  I won t get into how to process a MultipartFile entry  because there s plenty of docs on that already

[java] Multipart File upload Spring Boot

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