Spring学习笔记_37——@RequestMapping衍生注解

在Spring框架中，特别是Spring MVC或Spring Boot中，为了简化HTTP请求的处理，引入了一系列的注解来映射Web请求到处理方法。这些注解使得开发者可以更加直观地将特定类型的HTTP请求与控制器中的方法关联起来。

1. @GetMapping

@GetMapping注解只处理method属性为RequestMethod.GET的请求，相当于如下代码

@RequestMapping(method = RequestMethod.GET).

@GetMapping("/users")
public List<User> getAllUsers() {
    return userService.getAllUsers();
}

@GetMapping注解的源码如下：

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@RequestMapping(
    method = {RequestMethod.GET}
)
public @interface GetMapping {
    @AliasFor(
        annotation = RequestMapping.class
    )
    String name() default "";

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] value() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] path() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] params() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] headers() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] consumes() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] produces() default {};
}

2. @PostMapping

@PostMapping注解只处理method属性为RequestMapping.POST的请求，相当于代码如下：

@RequestMapping(method = RequestMapping.POST)

@PostMapping("/users")
public User createUser(@RequestBody User user) {
    return userService.createUser(user);
}

@PostMapping源码

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@RequestMapping(
    method = {RequestMethod.POST}
)
public @interface PostMapping {
    @AliasFor(
        annotation = RequestMapping.class
    )
    String name() default "";

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] value() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] path() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] params() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] headers() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] consumes() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] produces() default {};
}

3. @PutMapping

@PutMapping注解只处理method属性为RequestMethod.PUT的请求，相当于如下代码

@RequestMapping(method = RequestMethod.PUT)

@PutMapping("/users/{id}")
public User updateUser(@PathVariable Long id, @RequestBody User user) {
    return userService.updateUser(id, user);
}

@PutMapping注解的源码

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@RequestMapping(
    method = {RequestMethod.PUT}
)
public @interface PutMapping {
    @AliasFor(
        annotation = RequestMapping.class
    )
    String name() default "";

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] value() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] path() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] params() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] headers() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] consumes() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] produces() default {};
}

4. @DeleteMapping

@DeleteMapping注解只处理method属性为RequestMehtod.DELETE的请求，相当于如下代码：

@RequestMapping(method = RequestMethod.DELETE)

@DeleteMapping("/users/{id}")
public void deleteUser(@PathVariable Long id) {
    userService.deleteUser(id);
}

@DeleteMapping注解源码：

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@RequestMapping(
    method = {RequestMethod.DELETE}
)
public @interface DeleteMapping {
    @AliasFor(
        annotation = RequestMapping.class
    )
    String name() default "";

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] value() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] path() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] params() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] headers() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] consumes() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] produces() default {};
}

5. @PatchMapping

@PatchMapping注解只处理method属性为RequestMethod.PATCH的请求，相当于如下代码：

@RequestMapping(method = RequestMethod.PATCH)

@PatchMapping("/users/{id}")
public User patchUser(@PathVariable Long id, @RequestBody User userUpdates) {
    return userService.patchUser(id, userUpdates);
}

@PatchMapping注解的源码

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@RequestMapping(
    method = {RequestMethod.PATCH}
)
public @interface PatchMapping {
    @AliasFor(
        annotation = RequestMapping.class
    )
    String name() default "";

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] value() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] path() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] params() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] headers() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] consumes() default {};

    @AliasFor(
        annotation = RequestMapping.class
    )
    String[] produces() default {};
}

原文地址：https://blog.csdn.net/LuckyLay/article/details/143769394

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