Difference between spring Controller and RestController annotation

Question

Difference between spring  Controller and  RestController annotation   Can  Controller annotation be used for both Web MVC and REST applications  If yes  how can we differentiate if it is Web MVC or REST application

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RestController is the combination of  Controller and  ResponseBody  Flow of request in a  Controller class without using a  ResponseBody annotation    RestController returns an object as response instead of view

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Controller is used in legacy systems which use JSPs  it can return views   RestController is to mark the controller is providing REST services with JSON response type  so it wraps  Controller and  ResponseBody annotations together

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If you use  RestController you cannot return a view  By using Viewresolver in Spring springboot  and yes  ResponseBody is not needed in this case   If you use  Controller you can return a view in Spring web MVC

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Controller  This annotation is just a specialized version of  Component and it allows the controller classes to be auto-detected based on classpath scanning   RestController  This annotation is a specialized version of  Controller which adds  Controller and  ResponseBody annotation automatically so we do not have to add  ResponseBody to our mapping methods

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RestController annotated classes are the same as  Controller but the  ResponseBody on the handler methods are implied

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RestController is composition of  Controller and  ResponseBody  if we are not using the  ResponseBody in Method signature then we need to use the  Restcontroller

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Instead of using  Controller and  ResponseBody   RestController let s you expose Rest APIs in Spring 4 0 and above

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THE new  RestController annotation in Spring4   which marks the class as a controller where every method returns a domain object instead of a view  It   s shorthand for  Controller and  ResponseBody rolled together

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As you can see in Spring documentation  Spring RestController Documentation  Rest Controller annotation is the same as Controller annotation  but assuming that  ResponseBody is active by default  so all the Java objects are serialized to JSON representation in the response body

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In the code below I ll show you the difference between   controller   Controller public class RestClassName      RequestMapping value    uri       ResponseBody   public ObjectResponse functionRestName                      return instance          and  RestController    RestController public class RestClassName      RequestMapping value    uri      public ObjectResponse functionRestName                      return instance          the   ResponseBody is activated by default  You don t need to add it above the function signature

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Actually  be careful - they are not exactly the same   If you define any interceptors within your application  they will not apply to Controllers annotated as  RestController  however they do work with  Controller annotated controllers   ie  configuration for the interceptor    Configuration public class WebMvcConfiguration extends WebMvcConfigurerAdapter          Override     public void addInterceptors InterceptorRegistry registry            registry addInterceptor new TemplateMappingInterceptor    addPathPatterns          admin-functions     excludePathPatterns   login                 and in the declaration of a Spring controller    Controller public class AdminServiceController        Will work  however   RestController public class AdminServiceController        does not end up having the interceptor being associated with it

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RestController was provided since Spring 4 0 1  These controllers indicate that here  RequestMapping methods assume  ResponseBody semantics by default   In earlier versions the similar functionality could be achieved by using below     RequestMapping coupled with  ResponseBody like  RequestMapping value     abc   method   RequestMethod GET  produces   application xml       public  ResponseBody MyBean fetch     return new MyBean  hi       lt mvc annotation-driven  gt  may be used as one of the ways for using JSON with  Jackson or xml  MyBean can be defined like     XmlRootElement name    MyBean     XmlType propOrder     field2    field1        public class MyBean       field1      field2          getter  setter           ResponseBody is treated as the view here among MVC and it is dispatched directly instead being dispatched from Dispatcher Servlet and the respective converters convert the response in the related format like text html  application xml  application json     However  the Restcontroller is already coupled with ResponseBody and the respective converters  Secondly  here  since instead of converting the responsebody  it is automatically converted to http response

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Controller is used to mark classes as Spring MVC Controller   RestController is a convenience annotation that does nothing more than adding the  Controller and  ResponseBody annotations  see  Javadoc    So the following two controller definitions should do the same   Controller  ResponseBody public class MyController       RestController public class MyRestController

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Controller returns View   RestController returns ResponseBody

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The  Controller annotation indicates that the class is a  quot Controller quot  like a web controller while  RestController annotation indicates that the class is a controller where  RequestMapping methods assume  ResponseBody semantics by default i e  servicing REST API

[java] Difference between spring @Controller and @RestController annotation

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