dataType="int" 代表请求参数类型为int类型，当然也可以是Map、User、String等；

paramType="body" 代表参数应该放在请求的什么地方：

header-->放在请求头。请求参数的获取：@RequestHeader(代码中接收注解)
query-->用于get请求的参数拼接。请求参数的获取：@RequestParam(代码中接收注解)
path（用于restful接口）-->请求参数的获取：@PathVariable(代码中接收注解)
body-->放在请求体。请求参数的获取：@RequestBody(代码中接收注解)
form（不常用）

https://swagger.io/docs/specification/describing-parameters/

Parameter Types
OpenAPI 3.0 distinguishes between the following parameter types based on the parameter location. The location is determined by the parameter’s in key, for example, in: query or in: path.

path parameters, such as /users/{id}
query parameters, such as /users?role=admin
header parameters, such as X-MyHeader: Value
cookie parameters, which are passed in the Cookie header, such as Cookie: debug=0; csrftoken=BUSe35dohU3O1MZvDCU