Creating a reactive file controller

With our reactive image service in place, we can start to work on the reactive file controller.

For starters, let's create a HomeController as shown here:

    @Controller 
    public class HomeController { 
 
      private static final String BASE_PATH = "/images"; 
      private static final String FILENAME = "{filename:.+}"; 
 
      private final ImageService imageService; 
 
      public HomeController(ImageService imageService) { 
        this.imageService = imageService; 
      } 

The preceding code can be described as follows:

• @Controller: This indicates that it is a web controller, and will be registered by Spring Boot to handle web requests.
• BASE_PATH: This is a static string used to define the base of many routes.
• FILENAME: This is a pattern for filenames where the "." is included. Otherwise, Spring WebFlux will use the suffix as part of content negotiation (for example, .json would try to fetch a JSON response, while .xml would try to fetch an XML...