Load Image/Files from Spring Boot Rest api To the Android front end

Issue

This is my controller end point that will take the request from the frontend with the filename and using that filename image/file shall be returned. It works fine while testing on postman but I have no idea how to load images/files from this end point in android.

GetMapping("downloadFile/{fileName}")
    @PreAuthorize("hasRole('ADMIN') or hasRole('MODERATOR') or hasRole('USER')")
    public ResponseEntity<Resource> downloadFile(@PathVariable String fileName, HttpServletRequest request) {
        Resource resource = fileStorageService.loadFileAsResource(fileName);
        //System.out.println(resource);
        String contentType = null;
        try {
            contentType = request.getServletContext().getMimeType(resource.getFile().getAbsolutePath());
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        if (contentType == null) {
            contentType = AppConstants.DEFAULT_CONTENT_TYPE;
        }
        return ResponseEntity.ok().contentType(MediaType.parseMediaType(contentType))
                .header(HttpHeaders.CONTENT_DISPOSITION,
                        String.format(AppConstants.FILE_DOWNLOAD_HTTP_HEADER, resource.getFilename()))
                .body(resource);
    }

And My service for this looks like..

 public Resource loadFileAsResource(String fileName) {
            try {
                //Path filePath = this.fileStorageLocation.resolve(fileName).normalize();
                Path filePath= this.fileStoragePath.resolve(fileName).normalize();

                Resource resource = new UrlResource(filePath.toUri());

                if (resource.exists()) {
                    
                    return resource;
                } else {
                    throw new FileStorageException(AppConstants.FILE_NOT_FOUND + fileName);
                }
            } catch (MalformedURLException ex) {
                throw new FileStorageException(AppConstants.FILE_NOT_FOUND + fileName, ex);
            }
            
        }

I need to load image/files from here to the android frontend.

Solution

Picasso is the option to do this. just load your images with the resource you receive from server...

Answered By - Invincible System