@pathvariable

@RequestMapping 中的 @PathVariable 注解用于将 URL 中的变量绑定到方法的参数上。例如：

@GetMapping("/users/{userId}")
public User getUser(@PathVariable Long userId) {
    return userService.getUserById(userId);
}

在上面的示例中，@PathVariable 注解将 URL 中的 userId 变量绑定到 getUser() 方法的 userId 参数上，使得我们可以通过 userId 参数获取对应的用户信息。

相关问题

@PathVariable

@PathVariable is an annotation used in Spring MVC framework to bind a method parameter to a URI template variable. It is used to extract values from the URL path and use them as method parameters.

For example, if we have a URL like `/users/{userId}` where userId is the variable part of the URL, we can use @PathVariable to extract the value of userId and use it in the method.

Here's an example:

@GetMapping("/users/{userId}")
public String getUser(@PathVariable("userId") Long userId) {
  // do something with userId
  return "user";
}

In this example, @GetMapping is used to map a GET request to the URL `/users/{userId}`. The method parameter userId is annotated with @PathVariable to extract the value of userId from the URL path. The value of userId is then used in the method to retrieve user information.