@GetMapping for GET requests in Spring Boot - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the @GetMapping annotation in Spring Boot?

The @GetMapping annotation is used to map HTTP GET requests to specific handler methods in a Spring Boot controller. It tells the app which method to run when a GET request is received at a certain URL.

beginner

How do you specify the URL path for a GET request using @GetMapping?

You specify the URL path by passing it as a string value to @GetMapping, like @GetMapping("/hello"). This means the method handles GET requests sent to '/hello'.

intermediate

Can @GetMapping handle query parameters? How?

Yes, @GetMapping can handle query parameters by using method parameters annotated with @RequestParam. For example, @GetMapping("/search") with a method parameter @RequestParam String keyword will capture '?keyword=value' from the URL.

intermediate

What is the difference between @GetMapping and @RequestMapping(method = RequestMethod.GET)?

@GetMapping is a shortcut annotation specifically for GET requests. @RequestMapping(method = RequestMethod.GET) does the same but is more verbose. @GetMapping improves code readability.

beginner

Show a simple example of a Spring Boot controller method using @GetMapping.

Example:

@RestController
public class HelloController {
  @GetMapping("/hello")
  public String sayHello() {
    return "Hello, world!";
  }
}

This method returns 'Hello, world!' when a GET request is made to '/hello'.

What HTTP method does @GetMapping handle?

A GET

B POST

C PUT

D DELETE

@GetMapping is designed to handle HTTP GET requests only.

How do you specify the URL path in @GetMapping?

A As a method parameter

B As a string value inside parentheses, e.g., @GetMapping("/path")

C Using @RequestParam

D Using @PathVariable

The URL path is given as a string inside @GetMapping parentheses.

Which annotation is used to extract query parameters in a @GetMapping method?

A @PathVariable

B @RequestBody

C @RequestParam

D @ResponseBody

@RequestParam extracts query parameters from the URL.

What is the main advantage of @GetMapping over @RequestMapping(method = RequestMethod.GET)?

A It is shorter and clearer for GET requests

B It supports POST requests

C It automatically handles query parameters

D It requires no URL path

@GetMapping is a shortcut annotation making code cleaner for GET requests.

What will the following method return when accessed via GET /hello? @GetMapping("/hello") public String greet() { return "Hi!"; }

A An error

B Empty response

C null

D "Hi!"

The method returns the string "Hi!" as the response body.

Explain how @GetMapping works in a Spring Boot controller and how to use it to handle a GET request.

Think about how the app knows which method to run for a GET URL.

Describe the difference between @GetMapping and @RequestMapping for GET requests and why you might prefer @GetMapping.

Focus on simplicity and clarity in code.