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Creating Spring Boot Rest Api / RESTFul Service in java

Spring boot makes easy to create stand-alone, production-grade Spring-based applications, here are basic steps to create Rest api.

Please click on Creating Spring Boot Project if you have not set up spring boot project yet.

Create Controller 

A controller is a class that handles incoming HTTP requests and provides an appropriate response. In Spring Boot application, controllers are typically annotated with @Controller or @RestController annotations.

1. @Controller : This annotation is used to define controller, it is specialization of @component which is used to identify spring components

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

public class BookController {

    @RequestMapping(“/booktitle”)

    public String getBookTitle() {

    return “Spring Boot Tutorial”;

  }

}

2. @RestController : It is combination of  @Controller and @ResponseBody annotations. The @ResponseBody annotation tells Spring that the return value of the method should be serialized directly to the body of the HTTP response.

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

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

@RestController

public class BookController {

     @GetMapping(value = “/booktitle”)

      public String getBookTitle() {

            return “Spring Boot Tutorial”;

     }

}

Controllers often interact with services, which handle business logic, and repositories, which handle data access. And additionally uses annotations like @RequestMapping or @GetMapping to specify the URL patterns.

After Running application, Open browser and hit http://localhost:9080/yourcontroller mapping.

http://localhost:9080/booktitle