@GetMapping Spring boot

This article will cover @GetMapping annotation in spring boot with example.

@GetMapping annotation was introduced in Spring 4.3. It is applied over controller methods that handle HTTP GET requests.
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Prior to 4.3, @RequestMapping along with method attribute as RequestMethod.GET was used to configure GET request handler method as shown below

// before Spring 4.3
@RequestMapping(value="/users",method = RequestMethod.GET)
public List<User> getUsers() {
}

With @GetMapping, above method can be replaced as

@GetMapping("/users")
public List<User> getUsers() {
}

@GetMapping is followed by the string which signifies the URL for which this method will be exposed.
So, @GetMapping is a shorthand annotation for @RequestMapping.

Spring docs state,

@GetMapping is a composed annotation that acts as a shortcut for @RequestMapping(method = RequestMethod.GET).

Enabling @GetMapping
@GetMapping is added in spring 4.3. So, in order to use it you need to have below dependency as per the build tool

// MAVEN
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>6.0.11</version>
</dependency>

// GRADLE
implementation 'org.springframework:spring-webmvc:6.0.11'

or if you are using Spring boot, then add below dependency

// MAVEN
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>3.1.2</version>
</dependency>


// GRADLE
implementation 'org.springframework.boot:spring-boot-starter-web:3.1.2'

@GetMapping annotation example
Suppose you have a web application that accepts HTTP requests. You want to expose a URL that returns a list of all users.
Since the method returns something, it will be an HTTP GET request handler method.
It will be declared as

@GetMapping("users")
public List<User> getUsers() {
  // return list of users
}

Now, suppose there is another method that returns details of a user based on an id and this id is received from the URL.
Request handler method will be annotated with @GetMapping as shown below

@GetMapping("users/{id}") 
public User getUser(@PathVariable Integer id) { 
  // return detail of user
}

This method will be invoked when the URL being accessed is of the format user/1.
Note that the method parameter that receives the id, is annotated with @PathVariable annotation and {id} after the URL in @GetMapping denotes that this value will be received from the URL.
So, in this case the method parameter id will automatically be populated with 1.
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