Spring,@Controller,@RequestMapping, @ResponseBody,@RequestParam

1. @Controller, placed above the class to make the class take effect;

2. @RequestMapping, , specifies a mapping, method is the access method, and headers contains the specified request header

3.

@ResponseBody puts the returned information into the response header,
 4.@RequestParam, the attributes are

 

value: specify the alias, required: whether it is required, the default is true, defalutValue: the default value