@Builder 无法继承父类的解决方法

@Builder 无法继承父类的解决方法

假设父类BaseEntity中有createdBy、updatedBy字段，子类User中有name字段。那么在子类上加@Builder是不能为父类中的这两个字段设置值的。解决方案如下：

• 子类调用builder()方法时能为父类的createdBy字段设置值

  • cn.king.pojo.BaseEntity

    package cn.king.pojo;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public class BaseEntity {
             
    
        private String createdBy;
        private String updatedBy;
    
        public BaseEntity(String createdBy) {
             
            this.createdBy = createdBy;
        }
    
    }
    

  • cn.king.pojo.User

    package cn.king.pojo;
    
    import lombok.*;
    
    // 注意此处没有@Builder注解
    @Data
    @EqualsAndHashCode(callSuper = true)
    @NoArgsConstructor
    @AllArgsConstructor
    public class User extends BaseEntity{
             
    
        private String name;
    
        @Builder // 注意将@Builder注解加在此处，类上没有@Builder注解
        public User(String name,String createdBy) {
             
            super(createdBy);
            this.name = name;
        }
    
    }
    

  • cn.king.test.Demo01

    public class Demo01 {
             
        public static void main(String[] args) {
             
            User user = User.builder().name("tom").createdBy("anne").build();
            System.out.println(JSON.toJSONString(user));
        }
    }
    

• 子类调用builder()方法时能为父类的createdBy字段和updatedBy字段设置值

  • cn.king.pojo.BaseEntity

    package cn.king.pojo;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public class BaseEntity {
             
    
        private String createdBy;
        private String updatedBy;
    
    }
    

  • cn.king.pojo.User

    package cn.king.pojo;
    
    import lombok.*;
    
    // 注意此处没有@Builder注解
    @Data
    @EqualsAndHashCode(callSuper = true)
    @NoArgsConstructor
    @AllArgsConstructor
    public class User extends BaseEntity {
             
    
        private String name;
    
        @Builder // 注意将@Builder注解加到此处，类上没有@Builder注解
        public User(String name, String createdBy, String updatedBy) {
             
            super(createdBy, updatedBy);
            this.name = name;
        }
    
    }
    

  • cn.king.test.Demo01

    public class Demo01 {
             
        public static void main(String[] args) {
             
            User user = User.builder().name("tom").createdBy("anne").build();
            System.out.println(JSON.toJSONString(user));
            User user1 = User.builder().name("mike").createdBy("zhangsan").updatedBy("lisi").build();
            System.out.println(JSON.toJSONString(user1));
        }
    }