@PathVariable

@PathVariable是Spring框架中的注解，用于从URL中提取参数值。在Spring MVC中，@PathVariable注解可以用于获取RESTful URL中的参数，例如：

@GetMapping("/users/{id}")
public User getUserById(@PathVariable Long id) {
    // 根据id获取用户信息并返回
}

在上述示例中，@GetMapping注解用于映射HTTP GET请求，"/users/{id}"表示RESTful URL，其中的{id}是一个变量，用@PathVariable注解来获取该变量的值，并将其作为方法参数传入。

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@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.