Java 如何使用DozerBeanMapper将具有对象数组列表的HashMap（列表是HashMap中的值）映射到另一个HashMap？

我有两个类，希望使用org.dozer.Mapper（）将属性从女性对象映射到男性对象

第一类是：

public class Male {
    private String name;
    private String surname;

    private Map<String, List<Contact>> contacts;
....

我使用的like object属性的映射是LinkedHashMap，映射中的值列表是ArrayList。 当我尝试使用推土机映射它们时，哈希映射中的值数组列表不是包含对象的列表，如图所示：

        Map<String, List<Contact>> contact = new LinkedHashMap<>();
        List<Contact> listOfContacts = new ArrayList<>();
        Contact contactObj = new Contact();
        contactObj.setEmail("lala@gmail.com");
        contactObj.setPostcode("1233355");
        contactObj.setStreet("street");

        listOfContacts.add(contactObj);

        contact.put("2131323213", listOfContacts);
        femaleObj.setContact(contact);

        Mapper objectMapper = new DozerBeanMapper();
        Male maleObj = objectMapper.map(femaleObj, Male.class);

Map contact=newlinkedhashmap（）；
List-listOfContacts=new-ArrayList（）；
触点OBJ=新触点（）；
contactObj.setEmail（“lala@gmail.com");
contactObj.setPostcode（“1233355”）；
contactObj.setStreet（“街道”）；
Contacts.add列表（contactObj）；
联系方式（“21313213”，联系人列表）；
femaleObj.setContact（触点）；
Mapper objectMapper=new DozerBeanMapper（）；
Male maleObj=objectMapper.map（femaleObj，Male.class）；

---

如何获取男性对象列表中的对象列表？

首先，我按原样尝试了您的代码，得到了相同的行为

然后，我用b-hint显式地设置了映射配置（请参见），如下所示，我得到了您需要的

第一种情况-Java配置（创建扩展BeanMappingBuilder的类）：

第二种情况-XML配置：

<?xml version="1.0" encoding="UTF-8"?>
<mappings xmlns="http://dozer.sourceforge.net"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://dozer.sourceforge.net
          http://dozer.sourceforge.net/schema/beanmapping.xsd">

  <configuration>
    <stop-on-errors>true</stop-on-errors>
    <wildcard>true</wildcard>
  </configuration>

  <mapping>
    <class-a>blog.valerioemanuele.dozer.Female</class-a>
    <class-b>blog.valerioemanuele.dozer.Male</class-b>

      <field>
        <a>contacts</a>
        <b>contacts</b>
        <b-hint>blog.valerioemanuele.dozer.Contact</b-hint> 
      </field>
  </mapping> 


</mappings>

真的
真的
blog.valerioemanuele.dozer.Female
blog.valerioemanuele.dozer.Male

您可以从中获取完整的代码。该示例是使用Java8、Maven和Junit5开发的。

编辑：我添加了Java映射配置案例。从
中汲取灵感，如果您想用JAVA代码而不是XML配置实现同样的效果，请使用以下方法：

public class DemoProvider extends BeanMappingBuilder {

    @Override
    protected void configure() {
        mapping(Female.class, Male.class,
                TypeMappingOptions.oneWay()
        )
                .fields("contact", "contact",
                        FieldsMappingOptions.collectionStrategy(true, RelationshipType.NON_CUMULATIVE),
                        FieldsMappingOptions.hintA(Contact.class),
                        FieldsMappingOptions.hintB(Contact.class),
                        FieldsMappingOptions.oneWay()
                );
      }

}

用法：

DemoProvider demoProvider = new DemoProvider();
DozerBeanMapper objectMapper = new DozerBeanMapper();
objectMapper.addMapping(demoProvider);
Male maleObj = objectMapper.map(femaleObj, Male.class);

这是一个非常模糊的问题。您仅显示通过
Male-maleObj=objectMapper.map（femaleObj，Male.class）将
female映射到
Male
但不显示如何完成；此外，您发布的代码中没有出现
LinkedHashMap
或
ArrayList
。我已经编辑了代码，以便您可以查看，那么您的问题是什么？如何在男性对象的列表中获取对象列表-这没有什么意义对象列表（来自Contact类的实例）在我的男性对象中没有正确映射。你可以从我贴的照片上看到。
<?xml version="1.0" encoding="UTF-8"?>
<mappings xmlns="http://dozer.sourceforge.net"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://dozer.sourceforge.net
          http://dozer.sourceforge.net/schema/beanmapping.xsd">

  <configuration>
    <stop-on-errors>true</stop-on-errors>
    <wildcard>true</wildcard>
  </configuration>

  <mapping>
    <class-a>blog.valerioemanuele.dozer.Female</class-a>
    <class-b>blog.valerioemanuele.dozer.Male</class-b>

      <field>
        <a>contacts</a>
        <b>contacts</b>
        <b-hint>blog.valerioemanuele.dozer.Contact</b-hint> 
      </field>
  </mapping> 


</mappings>

import org.dozer.DozerBeanMapper;
import org.junit.Assert;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;

class TestFemaleToMaleConversion {

    private static Female femaleObj;

    @BeforeAll
    private static void initData() {
        Map<String, List<Contact>> contact = new LinkedHashMap<>();
        List<Contact> listOfContacts = new ArrayList<>();
        Contact contactObj = new Contact();
        contactObj.setEmail("lala@gmail.com");
        contactObj.setPostcode("1233355");
        contactObj.setStreet("street");

        listOfContacts.add(contactObj);

        contact.put("2131323213", listOfContacts);
        femaleObj = new Female();
        femaleObj.setName("Elisabeth");
        femaleObj.setSurname("Chesny");
        femaleObj.setContacts(contact);
    }

    @Test
    void testWithXmlMapping() {
        DozerBeanMapper objectMapper = new DozerBeanMapper();
        objectMapper.setMappingFiles(Arrays.asList("dozer-mapping.xml"));
        Male maleObj = objectMapper.map(femaleObj, Male.class);

        Assert.assertEquals("lala@gmail.com", maleObj.getContacts().get("2131323213").get(0).getEmail());
    }

    @Test
    void testWithJavaMapping() {
        DozerBeanMapper objectMapper = new DozerBeanMapper();
        objectMapper.addMapping(new CustomMapper());
        Male maleObj = objectMapper.map(femaleObj, Male.class);

        Assert.assertEquals("street", maleObj.getContacts().get("2131323213").get(0).getStreet());
    }
}

public class DemoProvider extends BeanMappingBuilder {

    @Override
    protected void configure() {
        mapping(Female.class, Male.class,
                TypeMappingOptions.oneWay()
        )
                .fields("contact", "contact",
                        FieldsMappingOptions.collectionStrategy(true, RelationshipType.NON_CUMULATIVE),
                        FieldsMappingOptions.hintA(Contact.class),
                        FieldsMappingOptions.hintB(Contact.class),
                        FieldsMappingOptions.oneWay()
                );
      }

}

DemoProvider demoProvider = new DemoProvider();
DozerBeanMapper objectMapper = new DozerBeanMapper();
objectMapper.addMapping(demoProvider);
Male maleObj = objectMapper.map(femaleObj, Male.class);