姬長信(Redy)

java-使用JAXB解组xml文件


我需要将archetype-catalog.xml文件的内容解析为Java Object结构.为此,我认为我将使用旧的JAXB.因此,我寻找了xml文件的xsd定义并从中生成了jaxb类:

ArchetypeCatalog.java

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlType;


/**
 *  0.0.0+
 * 
 * 

Java class for ArchetypeCatalog complex type. * *

The following schema fragment specifies the expected content contained within this class. * *

 * <complexType name="ArchetypeCatalog">
 *   <complexContent>
 *     <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *       <all>
 *         <element name="archetypes" minOccurs="0">
 *           <complexType>
 *             <complexContent>
 *               <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *                 <sequence>
 *                   <element name="archetype" type="{http://maven.apache.org/plugins/maven-archetype-plugin/archetype-catalog/1.0.0}Archetype" maxOccurs="unbounded" minOccurs="0"/>
 *                 </sequence>
 *               </restriction>
 *             </complexContent>
 *           </complexType>
 *         </element>
 *       </all>
 *     </restriction>
 *   </complexContent>
 * </complexType>
 * 

*
*
*/
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "ArchetypeCatalog", propOrder = {

})
public class ArchetypeCatalog {

protected ArchetypeCatalog.Archetypes archetypes;

/**
* Gets the value of the archetypes property.
*
* @return
* possible object is
* {@link ArchetypeCatalog.Archetypes }
*
*/
public ArchetypeCatalog.Archetypes getArchetypes() {
return archetypes;
}

/**
* Sets the value of the archetypes property.
*
* @param value
* allowed object is
* {@link ArchetypeCatalog.Archetypes }
*
*/
public void setArchetypes(ArchetypeCatalog.Archetypes value) {
this.archetypes = value;
}

/**
*

Java class for anonymous complex type.
*
*

The following schema fragment specifies the expected content contained within this class.
*
*

     * <complexType>
     *   <complexContent>
     *     <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
     *       <sequence>
     *         <element name="archetype" type="{http://maven.apache.org/plugins/maven-archetype-plugin/archetype-catalog/1.0.0}Archetype" maxOccurs="unbounded" minOccurs="0"/>
     *       </sequence>
     *     </restriction>
     *   </complexContent>
     * </complexType>
     * 

*
*
*/
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"archetype"
})
public static class Archetypes {

protected List archetype;

/**
* Gets the value of the archetype property.
*
*

* This accessor method returns a reference to the live list,
* not a snapshot. Therefore any modification you make to the
* returned list will be present inside the JAXB object.
* This is why there is not a set method for the archetype property.
*
*

* For example, to add a new item, do as follows:
*

         *    getArchetype().add(newItem);
         * 

*
*
*

* Objects of the following type(s) are allowed in the list
* {@link Archetype }
*
*
*/
public List getArchetype() {
if (archetype == null) {
archetype = new ArrayList();
}
return this.archetype;
}

}

}

原型.java

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlType;


/**
 * 
 *              Informations to point to an Archetype referenced in the catalog.
 *          
 * 
 * 

Java class for Archetype complex type. * *

The following schema fragment specifies the expected content contained within this class. * *

 * <complexType name="Archetype">
 *   <complexContent>
 *     <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *       <all>
 *         <element name="groupId" type="{http://www.w3.org/2001/XMLSchema}string" minOccurs="0"/>
 *         <element name="artifactId" type="{http://www.w3.org/2001/XMLSchema}string" minOccurs="0"/>
 *         <element name="version" type="{http://www.w3.org/2001/XMLSchema}string" minOccurs="0"/>
 *         <element name="repository" type="{http://www.w3.org/2001/XMLSchema}string" minOccurs="0"/>
 *         <element name="description" type="{http://www.w3.org/2001/XMLSchema}string" minOccurs="0"/>
 *       </all>
 *     </restriction>
 *   </complexContent>
 * </complexType>
 * 

*
*
*/
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Archetype", propOrder = {

})
public class Archetype {

protected String groupId;
protected String artifactId;
protected String version;
protected String repository;
protected String description;

/**
* Gets the value of the groupId property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getGroupId() {
return groupId;
}

/**
* Sets the value of the groupId property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setGroupId(String value) {
this.groupId = value;
}

/**
* Gets the value of the artifactId property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getArtifactId() {
return artifactId;
}

/**
* Sets the value of the artifactId property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setArtifactId(String value) {
this.artifactId = value;
}

/**
* Gets the value of the version property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getVersion() {
return version;
}

/**
* Sets the value of the version property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setVersion(String value) {
this.version = value;
}

/**
* Gets the value of the repository property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getRepository() {
return repository;
}

/**
* Sets the value of the repository property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setRepository(String value) {
this.repository = value;
}

/**
* Gets the value of the description property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getDescription() {
return description;
}

/**
* Sets the value of the description property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setDescription(String value) {
this.description = value;
}

}

ObjectFactory.java

import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.XmlElementDecl;
import javax.xml.bind.annotation.XmlRegistry;
import javax.xml.namespace.QName;


@XmlRegistry
public class ObjectFactory {

    private final static QName _ArchetypeCatalog_QNAME = new QName("http://maven.apache.org/plugins/maven-archetype-plugin/archetype-catalog/1.0.0", "archetype-catalog");


    public ObjectFactory() {
    }

    /**
     * Create an instance of {@link ArchetypeCatalog }
     * 
     */
    public ArchetypeCatalog createArchetypeCatalog() {
        return new ArchetypeCatalog();
    }

    /**
     * Create an instance of {@link Archetype }
     * 
     */
    public Archetype createArchetype() {
        return new Archetype();
    }

    /**
     * Create an instance of {@link ArchetypeCatalog.Archetypes }
     * 
     */
    public ArchetypeCatalog.Archetypes createArchetypeCatalogArchetypes() {
        return new ArchetypeCatalog.Archetypes();
    }

    /**
     * Create an instance of {@link JAXBElement }{@code }}
     * 
     */
    @XmlElementDecl(namespace = "http://maven.apache.org/plugins/maven-archetype-plugin/archetype-catalog/1.0.0", name = "archetype-catalog")
    public JAXBElement createArchetypeCatalog(ArchetypeCatalog value) {
        return new JAXBElement(_ArchetypeCatalog_QNAME, ArchetypeCatalog.class, null, value);
    }

}

但是,实际上取消组合example文件以进行测试时,我得到以下信息:

堆栈跟踪:

Exception in thread "main" java.lang.RuntimeException: an error occurred while unmarshalling xml into com.catalogupdater.plugin.jaxb.ArchetypeCatalog object
    at com.catalogupdater.plugin.converter.JAXBConverter.stringToObject(JAXBConverter.java:48)
    at Main.main(Main.java:60)
Caused by: javax.xml.bind.UnmarshalException: unexpected element (uri:"http://maven.apache.org/plugins/maven-archetype-plugin/archetype-catalog/1.0.0", local:"archetype-catalog"). Expected elements are (none)

有什么建议吗?
亲切的问候

编辑:
以下是我正在使用的完整解组逻辑:

   public static  T stringToObject( final String textClazz, final Class clazz )
   {
      T returnedValue = null;
      try
      {
         final JAXBContext jaxbContext = JAXBContext.newInstance( clazz );
         final Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
         final StringReader reader = new StringReader( textClazz );
         returnedValue = ( T ) unmarshaller.unmarshal( reader );
      }
      catch ( final JAXBException e )
      {
         throw new RuntimeException(
               "an error occurred while unmarshalling xml into " + clazz.getCanonicalName() + " object", e );
      }
      return returnedValue;
   }