@PathVariable

@PathVariable是Spring框架中的注解，用于从请求URL中提取参数值。在RESTful API中，我们通常会将参数值放在URL的路径中，例如：/users/{id}。此时，我们可以使用@PathVariable注解获取{id}的值，并将其绑定到方法的参数上。

例如：

@GetMapping("/users/{id}")
public User getUserById(@PathVariable Long id) {
   // 根据id查询用户信息
   User user = userService.getUserById(id);
   return user;
}

在上面的例子中，@PathVariable注解将{id}的值绑定到了getUserById方法的id参数上，使得我们可以直接使用id参数来查询对应用户的信息。

相关问题

@pathvariable

PathVariable is a Spring annotation used to extract values from the URI (Uniform Resource Identifier) path. It is used to bind a URI template variable to a method parameter in a Spring MVC controller.

For example, if you have a URI `http://example.com/api/person/{id}`, you can use `@PathVariable` to extract the `id` value from the URI path and pass it as a parameter to your Spring MVC controller method.

Here's an example of how to use `@PathVariable` in a Spring MVC controller:

@RestController
@RequestMapping("/api/person")
public class PersonController {

    @GetMapping("/{id}")
    public Person getPersonById(@PathVariable Long id) {
        // code to retrieve and return person object with given id
    }
}

In this example, the `@PathVariable` annotation is used to extract the `id` value from the URI path and pass it as a parameter to the `getPersonById` method in the `PersonController` class.