How can I accept multiple multipart files in my Spring MVC REST controller

Question

I have a Spring MVC REST controller that accepts a multipart file, as follows:

@Consumes(MediaType.MULTIPART_FORM_DATA) @RequestMapping(value = "/save-comment", method = RequestMethod.POST) public String addComment(@FormDataParam("jsonData") String jsonData, @FormDataParam("file") MultipartFile file, ModelMap model) { //My Logic to save file and data }

I use Jersey REST client in my application. The above code works fine for me. Now I am trying to POST multiple files to my REST controller.

I tried to change @FormDataParam("file") MultipartFile file to @FormDataParam("file") MultipartFile[] file but it is not working for me. How can I pass multiple files at a time to a REST controller?

The exception I get is: nested exception is

org.springframework.beans.BeanInstantiationException: Failed to instantiate [[Lorg.springframework.web.multipart.MultipartFile;]: No default constructor found; nested exception is java.lang.NoSuchMethodException: [Lorg.springframework.web.multipart.MultipartFile;.<init>()] with root cause java.lang.NoSuchMethodException: [Lorg.springframework.web.multipart.MultipartFile;.<init>()

K Kishore Kumar Reddy · Accepted Answer · 2018-05-30 10:11:52Z

Multiple File Upload concept , we can handle by using MultipartFile Interface.

Package: org.springframework.web.mutipart public interface MutipartFile

MutipartFile is an interface, Commonly Client will send or upload a file , it will be sent to server as in the form of mutipart request.

We will catch that mutipart request by using MutipartFile Concept. This MutipartFile Interface have number of method , those methods are used to get information of that file and if you want to do any copy or moving of a file also we can perform by one of the method called transferTo(“destinationPath”) ;

for better understanding purpose just visit https://walkintoknow.blogspot.com/2018/05/multiple-files-upload-concept-handling.html

 @RequestMapping(value="/multipleFilesUpload" , method=RequestMethod.POST, consumes="multipart/form-data", produces="application/json") public ResponseEntity<?> mutipleFileUpload(HttpServletRequest req, @RequestParam(value="file" , required = false) MultipartFile[] files) throws IOException{ for (MultipartFile file : files) { File f= new File(getPath()+createFolderInDesc("/appFiles /GSTC/mutipleUpload/"),file.getOriginalFilename()); try { file.transferTo(f); //Transfer or Saving in local memory } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } return null; }

if it helps please promote.

I am trying to post the multipart file to my REST Controller using jersey client. How do I do that? Can you help me with that
you can post multipart file to Rest Controller by configuring small steps , use this link for Multipart File upload using Jersey Frame work link

Alien · Accepted Answer · 2018-05-28 09:13:09Z

Just typecast normal http request to multipart request like below :

try { MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) httpServletRequest; List<MultipartFile> multipartFileList = multipartRequest .getFiles("images"); if (null != multipartFileList && !multipartFileList.isEmpty()) { for (MultipartFile file : multipartFileList) { String fileName = file.getOriginalFilename().trim(); if (file.getBytes().length > 0) { // logic goes gere } } } } catch (Exception ex) { ex.printStackTrace(); }

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