Sprｉngboot 错误信息：Required String parameter 'loginname' is not present 引发的研究

@PostMapping("/reg/change")
public CommonSdo change(
        @RequestParam(value = "oldPassword") String oldPassword,
        @RequestParam(value = "newPassword") String newPassword,
        @RequestParam(value = "confirmPassword") String confirmPassword){
    Member member = getCurrentMember();
    System.out.println("oldPassword"+oldPassword);

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这个问题就是参数传递问题　@RequestParam　　@RequestBody　　@PathVariable　，．．．．有时间研究一下

@RequestParam

@RequestBody　可以写一个ｄｔｏ类 @RequestBody　PasswordDto dto

public class PasswordDto{

 String oldPassword;
 String newPassword;
 String confirmPassword;
get...
set...
}