一、建立MapperFactory

手動建立

MapperFactory mapperFactory = new DefaultMapperFactory.Builder().build();

spring建立

@Bean
    public MapperFactory getFactory(){
        return new DefaultMapperFactory.Builder().build();
    }

二、使用方法

如果兩個類中的屬性名一樣，型別不一樣，會自動轉換。如果無法轉換會報錯。

1. 單個類對映單個類(欄位名不完全一樣)

//注意User中的name和UserVO中的username屬性名不同，age的型別也不同
 


class User {
    private String name;
    private String age;
    private String  sex;
    //Setter,Getter
}

class UserVO {
    private String username;
    private Integer age;
    private String  sex;
    //Setter,Getter
}

public void UserToUserVO(User user) {
    //先註冊以下對映方式
    mapperFactory.classMap(User.class, UserVO.class)
                .field("name"
 
,"username")//不一樣的欄位對映
                .byDefault()//剩餘的欄位對映
                .register();

    UserVO uservo = mapperFactory.getMapperFacade().map(user, UserVO.class);
}

2. 單個類對映單個類(欄位名完全一樣)

//注意age的型別不同

class User {
    private String username;
    private String age;
    private String  sex;
    //Setter,Getter
 

}

class UserVO {
    private String username;
    private Integer age;
    private String  sex;
    //Setter,Getter
}

public void UserToUserVO(User user) {
    UserVO uservo = mapperFactory.getMapperFacade().map(user, UserVO.class);
}

3. 集合對映呈另一個泛型的集合

//注意User中的name和UserVO中的username屬性名不同，age的型別也不同

class User {
    private String name;
    private String age;
    private String  sex;
    //Setter,Getter
}

class UserVO {
    private String username;
    private Integer age;
    private String  sex;
    //Setter,Getter
}

    public void copyUserListToUserVOList(List<User> userList){
        //手動配置不一樣的屬性轉換
        mapperFactory.classMap(User.class, UserVO.class)
                .field("name","username")//不一樣的欄位對映
                .byDefault()//剩餘的欄位對映
                .register();
        //轉換List
        List<UserVO> userVOList = mapperFactory.getMapperFacade().mapAsList(userList, UserVO.class);
        //列印驗證一下(重寫UserVO的tostring)
        userVOList.forEach(user -> {
            System.out.println(user);
        });

三、用了java8中的LocalDateTime結果發現轉換異常，解決方法為：在容器中增加一個bean，如下：

@Component
public class OrikaMapperFactoryExtend {
    @Autowired
    private MapperFactory mapperFactory;
    @PostConstruct
    public void init() {
        mapperFactory.getConverterFactory().registerConverter(new LocalDateTimeConverter());
        mapperFactory.getConverterFactory().registerConverter(new LocalDateConverter());
        mapperFactory.getConverterFactory().registerConverter(new LocalTimeConverter());
    }
    private class LocalDateTimeConverter extends BidirectionalConverter<LocalDateTime, LocalDateTime> {
        @Override
        public LocalDateTime convertTo(LocalDateTime source, Type<LocalDateTime> destinationType) {
            return LocalDateTime.from(source);
        }
        @Override
        public LocalDateTime convertFrom(LocalDateTime source, Type<LocalDateTime> destinationType) {
            return LocalDateTime.from(source);
        }
    }
    private class LocalDateConverter extends BidirectionalConverter<LocalDate, LocalDate> {
        @Override
        public LocalDate convertTo(LocalDate source, Type<LocalDate> destinationType) {
            return LocalDate.from(source);
        }
        @Override
        public LocalDate convertFrom(LocalDate source, Type<LocalDate> destinationType) {
            return LocalDate.from(source);
        }
    }
    private class LocalTimeConverter extends BidirectionalConverter<LocalTime, LocalTime> {
        @Override
        public LocalTime convertTo(LocalTime source, Type<LocalTime> destinationType) {
            return LocalTime.from(source);
        }
        @Override
        public LocalTime convertFrom(LocalTime source, Type<LocalTime> destinationType) {
            return LocalTime.from(source);
        }
    }
}