CODEWITHSUNDEEP
javaspringimagespring-mvcspring-rest
bpunzalan
bpunzalan

Reputation: 480

What is the preferred way of Image file handling for Spring Framework?

I have a project to create web services that would accept and manipulate images as a response using Spring.

I know the concept of RESTful APIs for Spring specifically for XML and JSON responses, the bindings with the java objects using the Jackson library, but I was looking for the same kind of thing but for other content-types like images.

I have the below functionality to upload and fetch the image but I am not sure on what @RequestBody object is needed to bind Image POJOs like BufferedImage so that I could manipulate it in the future.

// Upload the image from a browser through AJAX with URI "../upload"
@RequestMapping(value="/upload", method=RequestMethod.POST, consumes={"image/png", "image/jpeg"})
protected void upload(@RequestBody ???){
    // upload the image in a webserver as an Image POJO to make some image manipulation in the future. 
}

// Fetches the image from a webserver through GET request with URI "../fetch/{image}"
@RequestMapping(value="/fetch/{image}", method=RequestMethod.GET)
protected @ResponseBody String fetch(@PathVariable("image") String imageName){
    // fetch image from a webserver as a String with the path of the image location to be display by img html tag.
}

With this, I was looking for a more preferred way of doing the image file handling for Spring with a more concise explanation.

I have also read about BufferedImageHttpMessageConverter but not quite sure if it is useful to my application.

Thank you!

Please let me know your thoughts.

Upvotes: 1

Views: 1675

Answers (1)

StanislavL
StanislavL

Reputation: 57381

All you need for uploading is usual upload file.

@PostMapping("/upload") // //new annotation since 4.3
public String singleFileUpload(@RequestParam("file") MultipartFile file,
                               RedirectAttributes redirectAttributes) {

The code from the example

So you just send the file by POST with "multipart/form-data"

For downloading you should just write the image file bytes 

@GetMapping(value = "/image")
public @ResponseBody byte[] getImage() throws IOException {
    InputStream in = getClass()
      .getResourceAsStream("/com/baeldung/produceimage/image.jpg");
    return IOUtils.toByteArray(in);
}

The code from the example

Upvotes: 2

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