MapStruct高级用法

本文主要是介绍MapStruct高级用法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

MapStruct高级用法

1. 依赖注入（Using dependency injection）

   @Mapper(componentModel = SPRING)
   public interface SpringMapper {SpringMapper MAPPER = Mappers.getMapper(SpringMapper.class);PersonDTO personDoToDTO(Person person);
   }
   

   public static final class ComponentModel {private ComponentModel() {}public static final String DEFAULT = "default";public static final String CDI = "cdi";public static final String SPRING = "spring";public static final String JSR330 = "jsr330";public static final String JAKARTA = "jakarta";
   }
   

   示例代码：com.yxxmg.mapstruct.convert.SpringMapper

2. 组合多个映射

   @Mapper(imports = Date.class)
   public interface PersonMapper {PersonMapper MAPPER = Mappers.getMapper(PersonMapper.class);@Mapping(target = "personName", source = "name")@Mapping(target = "id", ignore = true)// 忽略id,不进行映射PersonDTO personDoToDTO(Person person);@Mapping(target = "personName", source = "name") // 指定映射@Mapping(target = "describe", source = "describe", defaultValue = "默认值") // 设置默认值@Mapping(target = "updateDate", expression = "java(new java.util.Date())") // 表达式 java@Mapping(target = "modifyDate", expression = "java(new Date())")@Mapping(target = "createDate", source = "createTime", dateFormat = "YYYY-MM-DD") // 格式化@Mapping(source = "source", target = "source", numberFormat = "#0.00")PersonDTO convert2(Person person);
   }
   

   示例代码：com.yxxmg.mapstruct.convert.PersonMapper

3. 嵌套对象属性映射

    @Mapperpublic interface CustomerMapper {@Mapping( target = "name", source = "record.name" )@Mapping( target = ".", source = "record" )@Mapping( target = ".", source = "account" )Customer customerDtoToCustomer(CustomerDto customerDto);}
   

4. 迭代器以及参数传递

   使用@IterableMapping、@Context

   @Mapper
   public interface MenuMapper {MenuMapper MAPPER = Mappers.getMapper(MenuMapper.class);@Mapping(target = "parentId", source = "parentId")Menu convert(String parentId, MenuDTO menuDTO);@IterableMapping(qualifiedByName = "convertDTO")List<Menu> convert(@Context String parentId, List<MenuDTO> menuDTOList);@Named("convertDTO")default Menu convertDTO(@Context String parentId, MenuDTO menuDTO) {return convert(parentId, menuDTO);}

   示例代码：com.yxxmg.mapstruct.convert.MenuMapper

5. 隐式转换

   例如可以定义默认方法将枚举转换成字符串或者数值，所有枚举字段会自动隐式转换，上述的例子中已经体现，就不举例说明

6. 映射参数到目标对象上@MappingTarget

   @Mapper
   public interface SourceTargetMapper {SourceTargetMapper MAPPER = Mappers.getMapper(SourceTargetMapper.class);void toEntity(ParentDto s, @MappingTarget ParentEntity t);@Mapper(unmappedTargetPolicy = ReportingPolicy.IGNORE)interface LenientMapper {void toEntity(ChildDto s, @MappingTarget ChildEntity t);}
   }
   

   示例代码:com.yxxmg.mapstruct.mappingtarget.SourceTargetMapper

7. 后续发现其他高级特性待补充…

示例代码相关地址

https://gitee.com/youxiaxiaomage/java-practices

这篇关于MapStruct高级用法的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---