ModelMapper:从对象到对象的映射库

╰半橙微兮° 2024-04-17 05:22 56阅读 0赞

1.  ModelMapper的maven依赖

<dependency>
    		     <groupId>org.modelmapper</groupId>
    		     <artifactId>modelmapper</artifactId>
    		     <version>2.1.1</version>
    		 </dependency>

1.  ModelMapper入口类  
    ModelMapper这个工具的入口类就是ModelMapper,因此转换就需要从这个类入口.简单看下API  
    1.addConverter() :顾名思义,添加转换器  
    2.addMappings() :添加映射器  
    3.createTypeMap() :创建A-B的转换器关系  
    4.getConfiguration() :获取配置  
    5.map() ;映射处理
2.  简单Model-DTO转换  
    1：地铁站实体类

/** * 地铁站实体类 * * @author lizhangyu * @date 2019-08-15 */
    @Entity
    @Table(name = "subway_station")
    public class SubwayStation { 
    
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long id;
    
        /** * 所属地铁线id */
        @Column(name = "subway_id")
        private Long subwayId;
    
        /** * 站点名称 */
        private String name;
    
        public Long getId() { 
            return id;
        }
    
        public void setId(Long id) { 
            this.id = id;
        }
    
        public Long getSubwayId() { 
            return subwayId;
        }
    
        public void setSubwayId(Long subwayId) { 
            this.subwayId = subwayId;
        }
    
        public String getName() { 
            return name;
        }
    
        public void setName(String name) { 
            this.name = name;
        }
    
    }

2:房屋图片返回结果实体类

/** * 地铁站返回结果实体类 * * @author lizhangyu * @date 2019-08-15 */
    public class SubwayStationDTO { 
    
        private Long id;
        private Long subwayId;
        private String name;
    
        public Long getId() { 
            return id;
        }
    
        public void setId(Long id) { 
            this.id = id;
        }
    
        public Long getSubwayId() { 
            return subwayId;
        }
    
        public void setSubwayId(Long subwayId) { 
            this.subwayId = subwayId;
        }
    
        public String getName() { 
            return name;
        }
    
        public void setName(String name) { 
            this.name = name;
        }
    }

1.  映射结果  
    ![modelMapper实体类的属性][modelMapper]  
    ![映射的结果][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDY5MDU1_size_16_color_FFFFFF_t_70]
2.  ModelMapper的优点  
    ModelMapper解决了实体类之间的赋值，不需要在用get和set方法，而且如果类的属性过于庞大，则get方法和set的方法所占的代码行数过多，有了ModelMapper，我们直接通过映射一行代码就可以解决。

[modelMapper]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/11/8043f291c96a479a884c09be652ee7c2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDY5MDU1_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/11/e2bd6ba83d7c4baebf424b6768b7c9ee.png