<xml-elements> MoXy 中 @XmlElementWrapper 的错误？

Question

我发现了一个棘手的错误：

如果我将 metadata-xml-binding 定义如下

<?xml version="1.0"?>
<xml-bindings xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
    package-name="package" xml-mapping-metadata-complete="true">
    <xml-schema element-form-default="QUALIFIED" />
    <java-types>
        <java-type name="SearchResult">
            <xml-root-element/>
            <java-attributes>
                <xml-element java-attribute="count"/>
                <xml-element java-attribute="requestParameters"/>
                <xml-element java-attribute="pageSize"/>
                <xml-element java-attribute="sortDirection"/>
                <xml-elements java-attribute="results">
                    <xml-element name="GaDictionaryElement" type="it.ga.model.GaDictionary">
                        <xml-element-wrapper name="GaDictionaryElementWrapper" />
                    </xml-element>
                    <xml-element name="OrganizationUnitElement" type="it.ga.model.OrganizationUnit">
                        <xml-element-wrapper name="OrganizationUnitElementWrapper" />
                    </xml-element>
                    <xml-element name="PersonElement" type="it.ga.model.Person">
                        <xml-element-wrapper name="PersonElementWrapper"  />
                    </xml-element>
                    <xml-element name="Empty" type="java.lang.String">
                        <xml-element-wrapper name="EmptyWrapper" nillable="true"/>
                    </xml-element>
                </xml-elements>
            </java-attributes>
        </java-type>
    </java-types>
</xml-bindings>

我看到<xml-element-wrapper> 标记不起作用，因为它位于<xml-elements> 标记周围的<xml-element> 标记中。所以我一直在寻找一种以干净的方式解决这个问题的方法。因为当我的班级的List<?> 结果为空时，我需要一个空节点。 一个非常糟糕的解决方法是为List<?> 结果创建许多不同的绑定文件，但我不喜欢这样！ 此外，是否有人尝试创建一个对实现特定接口的类有用的绑定文件？例如。以某种方式，我只能看到绑定文件上定义的对象的属性并将接口的名称指定为类型？我看到了这个：[博客]：http://blog.bdoughan.com/2010/07/moxy-jaxb-map-interfaces-to-xml.html#comment-form

Answer 1

就 MOXy 将处理的内容而言，您不得在 <xml-elements> 中使用 <xml-element-wrapper> 和 <xml-element>。您可以在 <xml-elements> 内有一个 <xml-element-wrapper。

oxm.xml

<?xml version="1.0"?>
<xml-bindings 
    xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
    package-name="forum16943280" 
    xml-mapping-metadata-complete="true">
    <java-types>
        <java-type name="SearchResult">
            <xml-root-element/>
            <java-attributes>
                <xml-elements java-attribute="results">
                    <xml-element name="GaDictionaryElement" type="forum16943280.GaDictionary"/>
                    <xml-element name="OrganizationUnitElement" type="forum16943280.OrganizationUnit"/>
                    <xml-element-wrapper name="results"/>
                </xml-elements>
            </java-attributes>
        </java-type>
    </java-types>
</xml-bindings>

搜索结果

package forum16943280;

import java.util.List;

public class SearchResult {

    private List<Object> results;

    public List<Object> getResults() {
        return results;
    }

    public void setResults(List<Object> results) {
        this.results = results;
    }

}

GaDictionary

package forum16943280;

public class GaDictionary {

}

组织单位

package forum16943280;

public class OrganizationUnit {

}

演示

package forum16943280;

import java.io.File;
import java.util.*;
import javax.xml.bind.*;
import org.eclipse.persistence.jaxb.JAXBContextProperties;

public class Demo {

    public static void main(String[] args) throws Exception {
        Map<String, Object> properties = new HashMap<String , Object>();
        properties.put(JAXBContextProperties.OXM_METADATA_SOURCE, "forum16943280/oxm.xml");
        JAXBContext jc = JAXBContext.newInstance(new Class[] {SearchResult.class}, properties);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        File xml = new File("src/forum16943280/input.xml");
        SearchResult result = (SearchResult) unmarshaller.unmarshal(xml);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(result, System.out);
    }

}

input.xml/Output

<?xml version="1.0" encoding="UTF-8"?>
<searchResult>
   <results>
      <OrganizationUnitElement/>
      <OrganizationUnitElement/>
   </results>
</searchResult>

input.xml/Output

<?xml version="1.0" encoding="UTF-8"?>
<searchResult>
   <results>
      <GaDictionaryElement/>
      <GaDictionaryElement/>
   </results>
</searchResult>

Answer 2

如果您想要单独的元素包装器，您可以按类型拆分 results 属性。

搜索结果

package forum16943280;

import java.util.List;

public class SearchResult {

    private List<GaDictionary> gaDictionaryResults;
    private List<OrganizationUnit> organizationUnitResults;

    public List<GaDictionary> getGaDictionaryResults() {
        return gaDictionaryResults;
    }

    public void setGaDictionaryResults(List<GaDictionary> results) {
        this.gaDictionaryResults = results;
    }

    public List<OrganizationUnit> getOrganizationUnitResults() {
        return organizationUnitResults;
    }

    public void setOrganizationUnitResults(
            List<OrganizationUnit> organizationUnitResults) {
        this.organizationUnitResults = organizationUnitResults;
    }

}

oxm.xml

<?xml version="1.0"?>
<xml-bindings 
    xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
    package-name="forum16943280" 
    xml-mapping-metadata-complete="true">
    <java-types>
        <java-type name="SearchResult">
            <xml-root-element/>
            <java-attributes>
                <xml-element 
                    java-attribute="gaDictionaryResults"
                    name="GaDictionaryElement">
                    <xml-element-wrapper name="GaDictionaryElementWrapper"/>
                </xml-element>
                <xml-element 
                    java-attribute="organizationUnitResults"
                    name="OrganizationUnitElement">
                    <xml-element-wrapper name="OrganizationUnitElementWrapper"/>
                </xml-element>
            </java-attributes>
        </java-type>
    </java-types>
</xml-bindings>

演示

package forum16943280;

import java.io.File;
import java.util.*;
import javax.xml.bind.*;
import org.eclipse.persistence.jaxb.JAXBContextProperties;

public class Demo {

    public static void main(String[] args) throws Exception {
        Map<String, Object> properties = new HashMap<String , Object>();
        properties.put(JAXBContextProperties.OXM_METADATA_SOURCE, "forum16943280/oxm.xml");
        JAXBContext jc = JAXBContext.newInstance(new Class[] {SearchResult.class}, properties);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        File xml = new File("src/forum16943280/input.xml");
        SearchResult result = (SearchResult) unmarshaller.unmarshal(xml);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(result, System.out);
    }

}

input.xml/Output

<?xml version="1.0" encoding="UTF-8"?>
<searchResult>
   <GaDictionaryElementWrapper>
      <GaDictionaryElement/>
      <GaDictionaryElement/>
   </GaDictionaryElementWrapper>
</searchResult>

input.xml/Output

<?xml version="1.0" encoding="UTF-8"?>
<searchResult>
   <OrganizationUnitElementWrapper>
      <OrganizationUnitElement/>
      <OrganizationUnitElement/>
   </OrganizationUnitElementWrapper>
</searchResult>

Answer 3

<?xml version="1.0"?>
<xml-bindings xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
    package-name="it.core.widget.dto" xml-mapping-metadata-complete="true">
    <xml-schema element-form-default="QUALIFIED" />
    <java-types>
        <java-type name="JaxbSearchResult" xml-accessor-type="NONE">
            <xml-root-element />
            <xml-type prop-order="count pageSize requestParameters sortDirection results" />
            <java-attributes>
                <xml-element java-attribute="count" />
                <xml-element java-attribute="requestParameters" />
                <xml-element java-attribute="pageSize" />
                <xml-element java-attribute="sortDirection" />
                <xml-elements java-attribute="results">
                    <xml-element name="gaDictionaryElement" type="it.ga.model.GaDictionary" />
                    <xml-element name="organizationUnitElement" type="it.ga.model.OrganizationUnit" />
                    <xml-element name="personElement" type="it.ga.model.Person" />
                    <xml-element-wrapper />
                </xml-elements>
            </java-attributes>
        </java-type>
    </java-types>
</xml-bindings>

这是 xml，如果我删除 <xml-element-wrapper /> 就可以使用

此外，如果没有该标签，它会产生上述输出

<?xml version="1.0" encoding="UTF-8"?>
<jaxbSearchResult>
    <count>3</count>
    <pageSize>30</pageSize>
    <style>1</style>
    <discriminator>equipment</discriminator>
    <posting>1</posting>
    <CLEAR>1</CLEAR>
    <sortDirection> ASC </sortDirection>
    <gaDictionaryElement>
        <id>24964</id>
        <startDate>2013-03-12T00:00:00</startDate>
        <gaDictionaryMap />
        <booleanMap />
        <integerMap />
        <numberMap />
        <clobMap />
        <parentGaDictionaryLinkSet />
        <childGaDictionaryLinkSet />
        <displayValue>Equipment 2</displayValue>
    </gaDictionaryElement>
    <gaDictionaryElement>
        <id>24962</id>
        <startDate>2013-03-12T00:00:00</startDate>
        <gaDictionaryMap />
        <booleanMap />
        <integerMap />
        <numberMap />
        <clobMap />
        <parentGaDictionaryLinkSet />
        <childGaDictionaryLinkSet />
        <displayValue>Equipment 1</displayValue>
    </gaDictionaryElement>
    <gaDictionaryElement>
        <id>25185</id>
        <startDate>2013-04-22T00:00:00</startDate>
        <gaDictionaryMap />
        <booleanMap />
        <integerMap />
        <numberMap />
        <clobMap />
        <parentGaDictionaryLinkSet />
        <childGaDictionaryLinkSet />
        <displayValue>Attrezzatura test</displayValue>
    </gaDictionaryElement>
</jaxbSearchResult>

我需要相应地包装 gaDictionaryElement 已编组的类型。 任何帮助表示赞赏。 此外，是否有人尝试创建一个对实现特定接口的类有用的绑定文件？例如。以某种方式，我只能看到绑定文件上定义的对象的属性并将接口的名称指定为类型？我看过这个： [博客]：http://blog.bdoughan.com/2010/07/moxy-jaxb-map-interfaces-to-xml.html#comment-form