注释类型 SessionAttribute

@Target(PARAMETER)
@Retention(RUNTIME)
@Documented
public @interface SessionAttribute

Annotation to bind a method parameter to a session attribute.

The main motivation is to provide convenient access to existing, permanent session attributes (e.g. user authentication object) with an optional/required check and a cast to the target method parameter type.

For use cases that require adding or removing session attributes consider injecting org.springframework.web.context.request.WebRequest or javax.servlet.http.HttpSession into the controller method.

For temporary storage of model attributes in the session as part of the workflow for a controller, consider using SessionAttributes instead.