springmvc 接收json類型的數據封裝到map中

@ApiOperation(value = "登錄測試")
@RequestMapping(
        value = "/loginin",
        method = RequestMethod.POST,
        produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public ResMessage loginin(@RequestBody Map<String,String> loginMap) {

    String userName = (String)loginMap.get("userName");
    String password = (String)loginMap.get("password");

    return  loginService.loginAd(userName,password);

}

post請求，要使用@requestBody 
get請求可以使用@RequestParam