Quick Answer: What Is Difference Between @Controller And @RestController In Spring Boot?

What is Spring REST API?

Spring RestController annotation is used to create RESTful web services using Spring MVC.

Spring RestController takes care of mapping request data to the defined request handler method.

Once response body is generated from the handler method, it converts it to JSON or XML response..

What is REST API example?

An application implementing a RESTful API will define one or more URL endpoints with a domain, port, path, and/or querystring — for example, https://mydomain/user/123?format=json .

How does REST API work?

What Is A REST APIAn API is an application programming interface. … REST determines how the API looks like. … Each URL is called a request while the data sent back to you is called a response.The endpoint (or route) is the url you request for. … The root-endpoint is the starting point of the API you’re requesting from.More items…•

Why controller is used 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 Requestbody?

This is used to convert the body of the HTTP request to the java class object with the aid of selected HTTP message converter. This annotation will be used in the method parameter and the body of the http request will be mapped to that method parameter.

Can I use @component instead of @controller?

It doesn’t provide any additional behavior over the @Component annotation. You can use @Service over @Component in service-layer classes as it specifies intent in a better way. @Repository: This annotation is a specialization of the @Component annotation with similar use and functionality.

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 @controller annotation in spring boot?

@Controller annotation indicates that the annotated class is a controller. It is a specialization of @Component and is autodetected through classpath scanning. It is typically used in combination with annotated handler methods based on the @RequestMapping annotation.

How do I expose a REST API in spring boot?

How to Create a REST API With Spring BootCreate the Spring Boot Project.Define Database configurations.Create an Entity Class.Create JPA Data Repository layer.Create Rest Controllers and map API requests.Create Unit Testing for API requests and run the unit testing.Build and run the Project.

What is the use of @RestController in spring boot?

The @RestController annotation was introduced in Spring 4.0 to simplify the creation of RESTful web services. It’s a convenience annotation that combines @Controller and @ResponseBody – which eliminates the need to annotate every request handling method of the controller class with the @ResponseBody annotation.

Is spring boot a backend?

Its active community offers a well-supported backend for different types of application needs. The highlights of the framework are that it fits every Java application very well and a wide range of extensions is available for designing the ultimate web applications at the top of the Java EE platform.

What is RequestMapping?

@RequestMapping is one of the most common annotation used in Spring Web applications. This annotation maps HTTP requests to handler methods of MVC and REST controllers. In this post, you’ll see how versatile the @RequestMapping annotation is when used to map Spring MVC controller methods.

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).

What is @ResponseBody in spring boot?

@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.

Is @ResponseBody required?

You can see that if you use Spring MVC @Controller annotation to create a RESTful response you need to annotate each method with the @ResponseBody annotation, which is not required when you use @RestController. It not only makes your code more readable but also saves a couple of keystrokes for you.

What is @controller in Spring MVC?

Spring Web Model-View-Controller Here, the @Controller annotation is used to mark the class as the controller. … Front Controller – In Spring Web MVC, the DispatcherServlet class works as the front controller. It is responsible to manage the flow of the Spring MVC application.

What is the use of @RequestMapping?

RequestMapping annotation is used to map web requests onto specific handler classes and/or handler methods. @RequestMapping can be applied to the controller class as well as methods.

Which two annotations are added automatically as a convenience if you use @RestController on a class?

using the @restcontroller annotation spring 4.0 introduced @restcontroller, a specialized version of the controller which is a convenience annotation that does nothing more than add the @controller and @responsebody annotations.