点击邮递员的请求时在 POSTMapping 中获取 null

Question

我是 spring 新手，在创建一个 POSTMapping 来 addUser 时，我在邮递员上收到 406 错误，在控制器类中收到 null 。

package com.codedecode.userinfo.DTO;

import lombok.*;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class UserDTO {
 private int userId;
 private String userName;
 private String userPassword;
 private String address;
 private String city;
}

下面是我发送到控制器的 JSON

  {
   "userName": "John",
   "userPassword": "password123",
   "address": "123 Main St",
   "city": "Anytown"
  }

实体类在下面

   package com.codedecode.userinfo.Entity;

   import jakarta.persistence.Entity;
   import jakarta.persistence.GeneratedValue;
   import jakarta.persistence.GenerationType;
   import jakarta.persistence.Id;
   import lombok.*;

   @Entity
   @Data
   @AllArgsConstructor
   @NoArgsConstructor
   public class User {
   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   private int userId;
   private String userName;
   private String userPassword;
   private String address;
   private String city;

}

下面是映射界面。

package com.codedecode.userinfo.mapper;
import com.codedecode.userinfo.DTO.UserDTO;
import com.codedecode.userinfo.Entity.User;
import org.mapstruct.Mapper;
import org.mapstruct.factory.Mappers;
import org.springframework.beans.factory.annotation.Autowired;

@Mapper
public interface UserMapper {
    @Autowired
    UserMapper INSTANCE = Mappers.getMapper(UserMapper.class);
    UserDTO mapUserToUserDTO(User user);
    User mapUserDTOtoUser(UserDTO userDTO);
}

这是控制器类代码

    @PostMapping("/addUser")
    public ResponseEntity<UserDTO> addUser(@RequestBody UserDTO userDTO){
        UserDTO savedUser = userService.addUser(userDTO);
        return new ResponseEntity<>(savedUser, HttpStatus.OK);
    }

我得到了 userDTO 对象，但用户名，用户密码一切都是空的

Answer 1

看来您的项目或 IDE 中的 lombok 配置有问题。要检查 UserDto 映射器接口实现是否已正确生成，如果不是这种情况，我会推荐您这篇post。此外，请确保您在 IDE 中启用了注释处理器。这可以解决你的问题