java 如何使用modelMapper转换嵌套类
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How to use modelMapper to convert nested classes
提问by user497087
I have a simple class that I want to map to a DTO class using modelMapper.
我有一个简单的类，我想使用 modelMapper 将其映射到 DTO 类。
class Source {
private String name;
private String address;
List<Thing> things;
// getters and setters follows
}
class Thing {
private String thingCode;
private String thingDescription;
// getters and setters
}
and I want to convert these to a sourceDTO that contains a list of ThingDTOs, for example
我想将这些转换为包含 ThingDTO 列表的 sourceDTO，例如
class sourceDTO {
private String name;
private String address;
List<ThingDTO> things;
// getters and setters.
}
class ThingDTO {
private String thingCode;
private String thingDescription;
// getters and setters
}
If I drop my list of Things and list of ThingsDTO then modelmapper is a delight to use,
如果我删除我的事物列表和事物DTO列表，那么使用模型映射器是一种乐趣，
modelMapper.map(source, SourceDTO.class);
But I can't work out how to get the mapper to convert the List of Things to List of ThingDTOs. From the documentation, I think I need to create a mapper class that extends PropertyMap but I can't work out how to configure it.
但是我不知道如何让映射器将事物列表转换为事物列表。从文档中，我认为我需要创建一个扩展 PropertyMap 的映射器类，但我不知道如何配置它。
Any pointers to the relevant documentation would be welcome
欢迎任何指向相关文档的指针
采纳答案by Pau
I think if you configure your ModelMapper as LOOSE or STANDARD it will do for you.
我认为如果您将 ModelMapper 配置为 LOOSE 或 STANDARD，它会为您服务。
modelMapper = new ModelMapper();
modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.LOOSE);
Otherwhise you could try next:
否则你可以尝试下一个：
You may create a converter like:
public class ListThingToThingDTOConverter implements Converter<List<Thing>, List<ThingDTO>> { @Override public List<ThingDTO> convert(MappingContext<List<Thing>, List<ThingDTO>> context) { List<Thing> source = context.getSource(); List<ThingDTO> output = new ArrayList<>(); ... //Convert programmatically List<Thing> to List<ThingDTO> ... return output; }}Then customize a Mapping Thing to ThingDTO as next:
public class SourceToSourceDTOMap extends PropertyMap<Thing, ThingDTO> { @Override protected void configure(){ using(new ListThingToThingDTOConverter()).map(source.getThings()).setThings(null); }Finally you must add SourceToSourceDTOMap to your ModelMapper as below:
modelMapper = new ModelMapper(); modelMapper.addMappings(new SourceToSourceDTOMap());
您可以创建一个转换器，如：
public class ListThingToThingDTOConverter implements Converter<List<Thing>, List<ThingDTO>> { @Override public List<ThingDTO> convert(MappingContext<List<Thing>, List<ThingDTO>> context) { List<Thing> source = context.getSource(); List<ThingDTO> output = new ArrayList<>(); ... //Convert programmatically List<Thing> to List<ThingDTO> ... return output; }}然后自定义一个映射事物到 ThingDTO 如下：
public class SourceToSourceDTOMap extends PropertyMap<Thing, ThingDTO> { @Override protected void configure(){ using(new ListThingToThingDTOConverter()).map(source.getThings()).setThings(null); }最后，您必须将 SourceToSourceDTOMap 添加到您的 ModelMapper 中，如下所示：
modelMapper = new ModelMapper(); modelMapper.addMappings(new SourceToSourceDTOMap());
回答by Vignesh_A
You can map like the below code by creating generics . link for reference
您可以通过创建泛型来映射如下代码。链接供参考
http://modelmapper.org/user-manual/generics/
http://modelmapper.org/user-manual/generics/
imports :
进口：
import java.lang.reflect.Type;
import org.modelmapper.ModelMapper;
import org.modelmapper.TypeToken;
In your service or controller class:
在您的服务或控制器类中：
ModelMapper modelMapper = new ModelMapper();
Type listType = new TypeToken<SourceDTO>(){}.getType();
SourceDTO sourceDTO = modelMapper.map(source,listType);
