[Spring] Spring Boot REST Controller

Basic code

REST CRUD APIs(3)

@RestController <- Adds REST support
@RequestMapping("/test") 
public class DemoResetController {

	@GetMapping("/hello") <-Access the REST endpoint at /test/hello
	public String sayHello(){
		return "Hello World"; <- Returns content to client
	}
}

Web Browser vs Postman

• For simple REST testing for GET requests
  • Web Browser and Postman are similar
• However, for advanced REST testing: POST, PUT etc…
  • Postman has much better support
  • POSTing JSON data, setting content type
  • Passing HTTP request headers, authentication etc…

Development Process

1. Add Maven dependency for Spring Boot Starter Web
2. Create Spring REST Service using @RestController

Step 1: Add Maven Dependency

File: pom.xml
<!-- Add Spring Boot Starter Web -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifacId>spring-boot-starter-web</artifacId>
</dependency>
// At Spring Initializr website,
// Can also select the "Web" dependency

Step 2: Create Spring REST Service

@RestController  
@RequestMapping("/test")  
public class DemoRestController {  
  
    // add code for the "/hello" endpoint  
  
    @GetMapping("/hello")  <- Handles HTTP GET requests
    public String sayHello(){  
        return "Hello World";  
    }  
}

출처 luv2code.com