@SessionAttributes

See equivalent in the Servlet stackspring-doc.cn

@SessionAttributes is used to store model attributes in the WebSession between requests. It is a type-level annotation that declares session attributes used by a specific controller. This typically lists the names of model attributes or types of model attributes that should be transparently stored in the session for subsequent requests to access.spring-doc.cn

Consider the following example:spring-doc.cn

@Controller
@SessionAttributes("pet") (1)
public class EditPetForm {
	// ...
}
1 Using the @SessionAttributes annotation. 
@Controller
@SessionAttributes("pet") (1)
class EditPetForm {
	// ...
}
1 Using the @SessionAttributes annotation.

On the first request, when a model attribute with the name, pet, is added to the model, it is automatically promoted to and saved in the WebSession. It remains there until another controller method uses a SessionStatus method argument to clear the storage, as the following example shows:spring-doc.cn

@Controller
@SessionAttributes("pet") (1)
public class EditPetForm {

	// ...

	@PostMapping("/pets/{id}")
	public String handle(Pet pet, BindingResult errors, SessionStatus status) { (2)
		if (errors.hasErrors()) {
			// ...
		}
			status.setComplete();
			// ...
		}
	}
}
1 Using the @SessionAttributes annotation.
2 Using a SessionStatus variable. 
@Controller
@SessionAttributes("pet") (1)
class EditPetForm {

	// ...

	@PostMapping("/pets/{id}")
	fun handle(pet: Pet, errors: BindingResult, status: SessionStatus): String { (2)
		if (errors.hasErrors()) {
			// ...
		}
		status.setComplete()
		// ...
	}
}
1 Using the @SessionAttributes annotation.
2 Using a SessionStatus variable.