@RequestMapping for base paths in Spring Boot - Cheat Sheet & Quick Revision

Recall & Review

beginner

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

@RequestMapping is used to map web requests to specific handler classes or methods in Spring Boot. It defines the URL path and HTTP method that a controller or method will respond to.

beginner

How does <code>@RequestMapping</code> work when placed on a class level?

When @RequestMapping is placed on a class, it sets a base path for all the methods inside that class. Each method's path is appended to this base path.

beginner

Example: What URL will the method respond to if the class has <code>@RequestMapping("/api")</code> and the method has <code>@RequestMapping("/users")</code>?

The method will respond to requests at /api/users. The class-level path /api is combined with the method-level path /users.

intermediate

Can @RequestMapping specify HTTP methods? How?

Yes. You can specify HTTP methods like GET, POST, etc., using the method attribute, for example: @RequestMapping(value = "/path", method = RequestMethod.GET).

beginner

What happens if you omit the path in <code>@RequestMapping</code> at the class level?

<p>If omitted, the class does not set a base path, so method-level paths are treated as absolute from the root context.</p>

What does @RequestMapping("/app") on a class do?

A Sets a base URL path for all methods in the class

B Maps only GET requests to the class

C Defines a response type for the class

D Disables all mappings in the class

Class-level @RequestMapping sets a base path for all methods inside the class.

If a method has @RequestMapping("/list") and the class has @RequestMapping("/api"), what is the full path?

A /api

B /list

C /api/list

D /list/api

The method path is appended to the class base path, resulting in /api/list.

How do you specify that a method should only handle POST requests with @RequestMapping?

A httpMethod = POST

B method = "POST"

C type = POST

D method = RequestMethod.POST

Use method = RequestMethod.POST inside @RequestMapping to specify POST requests.

What happens if no @RequestMapping is on the class but methods have paths?

A Methods do not respond to any requests

B Methods respond at root-level paths

C Class path defaults to "/default"

D Application throws an error

Without a class-level path, method paths are absolute from the root.

Which annotation is a shortcut for @RequestMapping with GET method?

A @GetMapping

B @PostMapping

C @PutMapping

D @DeleteMapping

@GetMapping is a shortcut for @RequestMapping(method = RequestMethod.GET).

Explain how @RequestMapping at the class level affects the URL paths of methods inside the class.

Think about how a street address works with a building and apartment number.

Describe how to restrict a method to handle only POST requests using @RequestMapping.

Consider how a door might only open for certain visitors.