Mastering Spring Boot 2.0

Implementing the REST service

Let's start by creating a simple REST controller as follows:

package com.dineshonjava.masteringspringboot.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

   @GetMapping("/hello")
   String sayHello(){
         return "Hello World!!!";
   }
} 

Let's see this small REST controller (HelloController) in detail:

• @RestController annotation: It indicates that this is the controller class and its result writes into the response body and doesn't want to render view
• @GetMapping annotation: It indicates a request handler method and it is a shorthand annotation for @RequestMapping(method = RequestMethod.GET) ...