Springboot-url routes: @Controller and @requestmapping

Springboot defining URL Handling methods: @Controller and @requestmapping

@Controller labeled class represents a controller that handles HTTP requests (that is, C in MVC), and all methods that are @RequestMapping labeled in that class are used to handle requests for the corresponding URLs.

In the SPRINGMVC framework, you can use @requsetmapping annotations to bind URLs to processing methods, for example:

@RestController  Public class Helloworldrestcontroller {    @RequestMapping ("/")    public  String HelloWorld () {        return "Hello World";    }    @RequestMapping ("/hello")    @ResponseBody    public  String Hello () {         return "FPC";    }}

The Helloworldrestcontroller class is labeled by @controller, where two of the methods are @requestmapping labeled and accessed in the browser after the application is run: localhost:8089, Requests are processed by the SPRINGMVC framework that is distributed to the Hellworld () method. The same input Localhost:8089/hello will be handed to the Hello () method for processing.

@ResponseBody callout Indicates that the handler function directly passes the return value of the function to the browser side display.

Operation Result:

Input localhost:8089:

Input Loalhost:8089/hello:

@RequestMapping Label class

@RequestMapping annotations can also be added to the class:

@RestController @requestmapping ("/index")  Public class Helloworldrestcontroller {    @RequestMapping ("/")    public  String HelloWorld () {        return "Hello World";    }    @RequestMapping ("/hello")    @ResponseBody    public  String Hello () {         return "FPC";    }}

The URL path of the Hello () method binding is/index/hello

Operation Result:
If direct access: Localhost:8089/hello:

If you visit: Localhost:8089/index/hello:

Tip: Each class can contain one or more methods of @requestmapping annotations, and often we will place URLs with similar business logic in the same controller.

Springboot-url routes: @Controller and @requestmapping