What Is The Use Of @Controller Annotation In Spring?

What is @controller annotation in spring?

@Controller annotation is an annotation used in Spring MVC framework (the component of Spring Framework used to implement Web Application).

The @Controller annotation indicates that a particular class serves the role of a controller.

This class perform the business logic (and can call the services) by its method..

What is the use of @RequestParam annotation in spring?

In Spring MVC, the @RequestParam annotation is used to read the form data and bind it automatically to the parameter present in the provided method. So, it ignores the requirement of HttpServletRequest object to read the provided data.

What is difference between @controller and @RestController in spring?

Difference between @RestController and @Controller in Spring. … The @Controller is a common annotation that is used to mark a class as Spring MVC Controller while @RestController is a special controller used in RESTFul web services and the equivalent of @Controller + @ResponseBody.

What’s the difference between @component @controller @repository & @service annotations in spring?

The difference between them is, @component is used to annotate compound classes, @Repository is a marker for automatic exception translation in the persistence layer, for service layer we need to use @service. You can refer Spring Documentation to know more.

What is the use of @repository annotation in spring?

@Repository is a Spring annotation that indicates that the decorated class is a repository. A repository is a mechanism for encapsulating storage, retrieval, and search behavior which emulates a collection of objects.

What is difference between @PathVariable and @RequestParam in spring?

1) The @RequestParam is used to extract query parameters while @PathVariable is used to extract data right from the URI. … Even though both are used to extract data from URL, @RequestParam is used to retrieve query parameters, anything after ? in the URL, while @PathVariable is used to retrieve values from URI itself.

What is the use of @controller in spring?

Spring RestController Spring @RestController is a convenience annotation that is itself annotated with @Controller and @ResponseBody. This annotation is used to mark a class as request handler for RESTful web services.

What is difference between @inject and @autowired?

The @Autowired annotation is used for auto-wiring in Spring framework. … The @Inject annotation also serves the same purpose, but the main difference between them is that @Inject is a standard annotation for dependency injection and @Autowired is spring specific.

What does @service annotation in spring?

Spring @Service annotation is a specialization of @Component annotation. Spring Service annotation can be applied only to classes. It is used to mark the class as a service provider. 1 Spring @Service Annotation.

What is use of @autowired in spring?

Advertisements. The @Autowired annotation provides more fine-grained control over where and how autowiring should be accomplished. The @Autowired annotation can be used to autowire bean on the setter method just like @Required annotation, constructor, a property or methods with arbitrary names and/or multiple arguments …

What is the use of @ResponseBody annotation in spring?

@ResponseBody is a Spring annotation which binds a method return value to the web response body. It is not interpreted as a view name. It uses HTTP Message converters to convert the return value to HTTP response body, based on the content-type in the request HTTP header.

What is the @controller annotation used for?

The basic purpose of the @Controller annotation is to act as a stereotype for the annotated class, indicating its role. The dispatcher will scan such annotated classes for mapped methods, detecting @RequestMapping annotations (see the next section).