How Spring MVC specifies the URL mapping for the processor

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Specify the URL mapping for the processor

This is an essential step in writing a controller class designed to handle one or more specific requests. Spring MVC provides the @ RequestMapping annotation to specify the URL mapping. Such as:

This step maps the URL schema / login and processes it with annotations or annotation classes. When the @ RequestMapping annotation is used on a class, the class becomes a single-action controller. Such as:

Import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; @ Controller @ RequestMapping ("/ hello") publicclassSingleActionController {@ RequestMapping (method = RequestMethod.GET) publicString sayHello () {return "hello";}}

When the @ RequestMapping annotation is used on a method, a multi-action controller can be generated. Such as:

Import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @ Controller publicclassUserController {@ RequestMapping ("/ listUsers") publicString listUsers () {return "ListUsers";} @ RequestMapping ("/ saveUser") publicString saveUser () {return "EditUser";} @ RequestMapping ("/ deleteUser") publicString deleteUser () {return "DeleteUser";}}

The @ RequestMapping annotation can also be used to specify multiple URL schemas and process them in a single way.

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