[JAVA] I made a function to register images with API in Spring Framework. Part 2 (Client Edition)

I made an API, so I will try to connect.

How to make API here

Connect using Jersey.

The whole picture of the client I made looks like this

ImageIOController.java

	@RequestMapping(value = "/imageCompleteApi", method = RequestMethod.POST)
	public ModelAndView imageUploadCompleteApi(ImageUploadFormApi imageUploadFormApi,
			Principal principal) {
		
		//Get credentials
        Authentication auth = (Authentication)principal;
        LoginUserDetails LoginUser = (LoginUserDetails)auth.getPrincipal();
		
		//Get binary data
		Integer FileSize = (int) (imageUploadFormApi.getImage().getSize());
		byte[] imageBinary = new byte[FileSize];
		
		try {
			 imageBinary = imageUploadFormApi.getImage().getBytes();
		} catch (IOException e) {
			//TODO auto-generated catch block
			e.printStackTrace();
		}

		//Request preparation
		PictureMaster pictureMaster = new PictureMaster();
		
		pictureMaster.setOriginalName(imageUploadFormApi.getImage().getOriginalFilename());
		pictureMaster.setPictureName(imageUploadFormApi.getFilename());
		pictureMaster.setExtension(imageUploadFormApi.getImage().getOriginalFilename()
				.substring(imageUploadFormApi.getImage().getOriginalFilename().length() - 4, imageUploadFormApi.getImage().getOriginalFilename().length()));
		pictureMaster.setBase64string(Base64.getEncoder().encodeToString(imageBinary));
		pictureMaster.setUploadUserId(LoginUser.getUserId());
	    //Call the API to register the image
		

		ObjectMapper mapper = new ObjectMapper();
		
		Entity<String> requestBody = null;
		String result = null;
		
		//Set the header.
		MultivaluedMap<String, Object> headers = new MultivaluedHashMap<>();
		headers.putSingle("X-SUBDOMEIN", "api");
		
		try {
			requestBody = Entity.json(mapper.writeValueAsString(pictureMaster));
			
			//Send a post request to the API to your server.
			Client client = ClientBuilder.newClient();
			WebTarget target = client.target("http://api.localhost:8080")
				    .path("/WebAquarium3.1/api/picture/addPicture");
			
			result = target
					.request()
					.headers(headers)
					.post(requestBody, String.class);
			
			
		} catch (IOException e1) {
			//TODO auto-generated catch block
			e1.printStackTrace();
		}
		
                		
        //Convert the received JSON to a class
		
		System.out.println(result);
		ModelAndView mv = new ModelAndView("ImageComplete");
		return mv;
	}

In the first half, you just process the acquired data according to the DB. The important thing is

ImageIOController.java

ObjectMapper mapper = new ObjectMapper();

It is a process from.

The processing flow is like this.

1. Set the required headers for the API.
2. Prepare request Entity
3. Set the header and request and execute POST.

First, here, convert the request to Json format and prepare it.

1. Set the required headers for the API.

ImageController.java

		//Set the header.
		MultivaluedMap<String, Object> headers = new MultivaluedHashMap<>();
		headers.putSingle("X-SUBDOMEIN", "api");

I will set the header required for the request. ** MultivaluedHashMap ** Header class for Jersey

2. Prepare request Entity

ImageController.java

			requestBody = Entity.json(mapper.writeValueAsString(pictureMaster));

Next, set the Json data in the Entity class. Json data is generated using Jackson.

3. Set the header and request and execute POST.

ImageController.java

			//Send a post request to the API to your server.
			Client client = ClientBuilder.newClient();
			WebTarget target = client.target("http://api.localhost:8080")
				    .path("/WebAquarium3.1/api/picture/addPicture");
			
			result = target
					.request()
					.headers(headers)
					.post(requestBody, String.class);

First, use ** ClientBuilder ** and ** WebTarget **, I will set which address of which domain to connect to

Then set the headers and posts in headers and post. The final ** String.class ** means the final "I'll receive the response as a string".

It seems that you can get it even with your own class if you set something called JerseyProvider, but I will not do it this time (Mendokusa (ry))

Let's connect

Let's connect now.

I will omit the operation of the screen a little. ; Tsu Д `)

I can confirm that the response is back.

The image has been registered in the DB!