Spring MVC learning – detailed explanation of URL parameter passing

In the process of learning spring MVC, it is necessary to understand several key parameters first:

@Controller：

If you annotate the class, this class will program a controller. Spring will automatically scan this class and map the corresponding URL route when the project starts.

@RequestMapping

Specify the URL mapping path. If requestmapping is configured on the controller and the specific request method is also configured with the path, the mapped path is the superposition of the two paths. Common mappings such as requestmapping ("URL. HTML")

Configure mapping path:

Above configuration mapping

http://***:8080:web1/get_ alluser. html：

If @ requestmapping (value = "/ user") is added to @ controller, the mapping path becomes

http://***:8080:web1/user/get_ alluser. html

@ResponseBody

Returns the string corresponding to the annotation method directly

@RequestParam

Automatically map the parameter corresponding to the URL to the value above the action. Requestparam is a required parameter by default.

@PathVariable

Gets the URL mapping parameter of the specified format in the @ requestmapping configuration

Page Jump:

Direct return JSON

The requested URL must be in JSON end, otherwise exception

Failed to load resource: the server responded with a status of 406 (Not Acceptable) ： The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers ()

Return entity:

Return action

Request:

/web1/urlinfo/getuser. json

Output:

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