Spring boot jpa mongo gridfs example

application.yml

spring:
    data:
      mongodb:
          host: localhost
          port: 27017
          database: myfiles

multipart:
  maxFileSize: 32Mb
  maxRequestSize: 32Mb

FileUploadController.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.gridfs.GridFsTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;

@Controller
public class FileUploadController {

    @Autowired
    private GridFsTemplate gridFsTemplate;

    @RequestMapping(method = RequestMethod.POST, value = "/upload")
    @ResponseBody
    public ResponseEntity<String> handleFileUpload(@RequestParam("file") MultipartFile file,
                                                   @RequestParam("filename") String filename) throws IOException {
        gridFsTemplate.store(file.getInputStream(), filename);
        return new ResponseEntity<>("", HttpStatus.OK);
    }

    @RequestMapping(method = RequestMethod.GET, value = "/{filename:.+}")
    @ResponseBody
    public ResponseEntity<?> getFile(@PathVariable String filename) {

        try {
            return ResponseEntity.ok(gridFsTemplate.getResource(filename));
        } catch (Exception e) {
            return ResponseEntity.notFound().build();
        }
    }
}