Java实体映射工具MapStruct使用方法详解

@Data
@AllArgsConstructor
public class User {
    private int id;
    private String name;
    private int age;
    private String address;
}

@Mapper
public interface UserConvert {
    UserConvert INSTANCE = Mappers.getMapper(UserConvert.class);
    @Mapping(source = "name", target = "userName")
    UserVO toVO(User entity);
}

@Test
public void contextLoads() {
    User user = new User(0, "Tester", 1, "上海市徐汇区");
    UserVO userVO = UserConvert.INSTANCE.toVO(user);
}

@Test
public void contextLoads() {
    User user = new User(0, "Tester", 1, "上海市徐汇区");
    UserVO userVO = UserConvert.INSTANCE.toVO(user);
}

@Mapper(uses=DateMapper.class)

@Mapper(imports = DateUtil.class)
public interface UserConvert {
    UserConvert INSTANCE = Mappers.getMapper(UserConvert.class);
    @Mappings({
            @Mapping(source = "name", target = "userName"),
            // 以指定方法转换属性，这里如果不使用imports，则需要写全引用类包路径
            @Mapping(target = "birthday", expression = "java(DateUtil.fORMatDate(entity.getBirthday()))")
    })
    UserVO toVO(User entity);
}

@Mapper(unmappedSourcePolicy = ReportingPolicy.ERROR)

@Mapper(componentModel = "spring")
public interface UserConvert {
    @Mapping(source = "name", target = "userName")
    UserVO toVO(User entity);
}

@Autowired
private UserConvert userConvert;

@MapperConfig(
        uses = DateUtil.class,
        unmappedSourcePolicy = ReportingPolicy.WARN
)
public interface UserConfig {
}

@Mapper(componentModel = "spring", config = UserConfig.class)

@Mappings({
        @Mapping(source = "name", target = "userName"),
        @Mapping(target = "birthday", expression = "java(DateUtil.formatDate(entity.getBirthday()))")
})
UserVO toVO(User entity);
List<UserVO> collectionCvt(List<User> entities);

public List<UserVO> collectionCvt(List<User> entities) {
    if (entities == null) {
        return null;
    } else {
        List<UserVO> list = new ArrayList(entities.size());
        Iterator var3 = entities.iterator();

        while(var3.hasNext()) {
            User user = (User)var3.next();
            // 集合转换时优先使用了已定义的toVO方法
            list.add(this.toVO(user));
        }

        return list;
    }
}

@MapperConfig(nullValueMappingStrategy = NullValueMappingStrategy.RETURN_DEFAULT)

@MapperConfig(
        mappingInheritanceStrategy = MappingInheritanceStrategy.EXPLICIT
)

@InheritConfiguration
void cvtVO(User entity, @MappingTarget UserVO vo);

@Mapping(target = "birthday", dateFormat = "yyyy-MM-dd HH:mm:ss")

@Mapping(target = "price", numberFormat = "$#.00")

@Mapping(target = "age", constant = "0")