How does session management work in Spring MVC?
Spring Session consists of following modules:
- Spring Session Core: Provides API and core support for session management.
- Spring Session JDBC: provides session management using relational database.
- Spring Session Data Redis: provides session management implementation for Redis database.
What is @SessionAttributes in Spring MVC?
@SessionAttribute annotation retrieve the existing attribute from the session. This annotation allows you to tell Spring which of your model attributes will also be copied to HttpSession before rendering the view.
How can use session attribute in Spring MVC?
9 Answers
- directly add one attribute to session: @RequestMapping(method = RequestMethod.GET) public String testMestod(HttpServletRequest request){ ShoppingCart cart = (ShoppingCart)request.getSession().setAttribute(“cart”,value); return “testJsp”; }
- Make your controller session scoped @Controller @Scope(“session”)
What is the purpose of ModelAndView in Spring MVC?
ModelAndView is a holder for both Model and View in the web MVC framework. These two classes are distinct; ModelAndView merely holds both to make it possible for a controller to return both model and view in a single return value. The view is resolved by a ViewResolver object; the model is data stored in a Map .
What is ModelAttribute in Spring MVC?
@ModelAttribute is an annotation that binds a method parameter or method return value to a named model attribute, and then exposes it to a web view. In this tutorial, we’ll demonstrate the usability and functionality of this annotation through a common concept, a form submitted from a company’s employee.
How does Spring manage session?
Spring Session is a powerful tool for managing HTTP sessions. With our session storage simplified to a configuration class and a few Maven dependencies, we can now wire up multiple applications to the same Redis instance and share authentication information. As always all the examples are available over on Github.
What is @InitBinder used for?
@InitBinder plays the role to identify the methods which used to initialize WebDataBinder . Initbinder is usually used to bind requestParams to custom objects.
What is difference between model and ModelAndView?
Model defines a holder for model attributes and is primarily designed for adding attributes to the model. ModelMap is an extension of Model with the ability to store attributes in a map and chain method calls. ModelAndView is a holder for a model and a view; it allows to return both model and view in one return value.
What is stateless session in spring?
Stateless, in this context, means that we don’t store any information about the logged-in user in memory. However, we still need to store information about the logged-in user somewhere and associate it with a client.
How session is managed in Microservices?
Distributed Session Management in Microservices The traditional monolith approach to session management involves storing the user’s session data on the server side. In a microservice application, the authentication service described above can provide a session ID for the client to include in subsequent requests.
What is WebDataBinder in spring?
WebDataBinder is a DataBinder that binds request parameter to JavaBean objects. It provides methods to assign our validator classes. Using addValidators() and setValidator() methods, we can assign our validators instances.
What is @ControllerAdvice in spring boot?
@ControllerAdvice is a specialization of the @Component annotation which allows to handle exceptions across the whole application in one global handling component. It can be viewed as an interceptor of exceptions thrown by methods annotated with @RequestMapping and similar.
What is the difference between ResponseBody and ResponseEntity?
ResponseEntity<> is a generic class with a type parameter, you can specify what type of object to be serialized into the response body. @ResponseBody is an annotation, indicates that the return value of a method will be serialized into the body of the HTTP response.
What is difference between @RequestParam and QueryParam?
What is main difference between @RequestParam and @QueryParam in Spring MVC controller? They’re functionally the same: they let you bind the value of a named HTTP param to the annotated variable. That being said, the question is very broad, so you’ll have to specify more detail if you want a more useful answer.
What is the difference between RequestParam and path variable?
1) The @RequestParam is used to extract query parameters while @PathVariable is used to extract data right from the URI.
Can we use @controller instead of @RestController?
Now, you don’t need to use the @Controller and the @RestponseBody annotation. Instead you can use the @RestController to provide the same functionality. In short, it is a convenience controller which combines the behavior of the @Controler and the @Response body into one.