Format of @ Controller and @ RestController and @ GetMapping and @ PostMapping receive parameters in java

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One, one. Using the @ Controller annotation, the view parser can parse the jsp,html page of return and jump to the corresponding page on the corresponding method

If you return json and other content to the page, you need to add @ ResponseBody annotation.

2.@RestController annotations are equivalent to the combination of @ Controller+@ResponseBody annotations. To return json data, you do not need to add @ ResponseBody annotations in front of the method, but using @ RestController annotations, you cannot return jsp,html pages, and the view parser cannot parse jsp,html pages.

II.

1. @ RequestMapping default method is supported by get,post.

2. @ RequestMapping (value = "createPickOrder.do", produces = "application/json;charset=utf-8", method = RequestMethod.POST)

Produces = "application/json;charset=utf-8": indicates the format of returned data

Method = RequestMethod.POST indicates the request format

Post request, if it is in json format (the transmission parameter is required to be json (application/json;charset=utf-8), the receiving parameter is either a parameter or an object and the parameter is preceded by @ RequestBody annotation); if it is a form submission (application/x-www-form-urlencoded), the receiving parameter can be either an object or multiple parameters.

Get request. Parameters cannot be in json (application/json;charset=utf-8) format, but can only be in form (application/x-www-form-urlencoded) format.

3 、

@ PostMapping

Map a POST request

New features of Spring MVC

Provides support for Restful style

@ GetMapping to process get requests

@ PostMapping to process post requests

@ PutMapping to process put requests

@ DeleteMapping to process delete requests

@ PostMapping (value = "/ user/login")

Equivalent to

@ RequestMapping (value = "/ user/login", method = RequestMethod.POST)

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