Jaxb應該編組內部類？

Question

看我有這片XSD的：

<xs:complexType name="ResourcesType"> 
    <xs:sequence> 
     <xs:element name="Classrooms"> 
     <xs:complexType mixed="true"> 
      <xs:sequence> 
      <xs:element type="ResourceType" name="Resource" maxOccurs="unbounded" minOccurs="0"/> 
      </xs:sequence> 
     </xs:complexType> 
     </xs:element> 
     <xs:element name="Teachers"> 
     <xs:complexType mixed="true"> 
      <xs:sequence> 
      <xs:element type="ResourceType" name="Resource" maxOccurs="unbounded" minOccurs="0"/> 
      </xs:sequence> 
     </xs:complexType> 
     </xs:element> 
     <xs:element name="Classes"> 
     <xs:complexType mixed="true"> 
      <xs:sequence> 
      <xs:element type="ResourceType" name="Resource" maxOccurs="unbounded" minOccurs="0"/> 
      </xs:sequence> 
     </xs:complexType> 
     </xs:element> 
     <xs:element name="Special"> 
     <xs:simpleType> 
      <xs:restriction base="xs:string"> 
      <xs:enumeration value="0"/> 
      <xs:enumeration value=""/> 
      </xs:restriction> 
     </xs:simpleType> 
     </xs:element> 
    </xs:sequence> 
    </xs:complexType> 

我生成的類從使用Eclipse插件架構和我得到這個：

ResourcesType類Classes，ClassRooms和Teachers內部類。 在所有這些內部類中，我都保護了List<Serializable>內容字段。 它也生成ClassesType,ClassRoomsType和TeachersType作爲正常類。

爲什麼生成這個內部類？如果其他類不可序列化，我將如何設置此列表？

謝謝
最好的問候

Answer 1

爲什麼產生這個內部類？

JAXB實現將爲匿名複雜類型的內部類。這樣做是爲了減少生成類的名稱衝突的可能性。

<xs:complexType name="ResourcesType"> 
    <xs:sequence> 
     <xs:element name="Classrooms"> 
     <xs:complexType mixed="true"> 
      <xs:sequence> 
      <xs:element type="ResourceType" name="Resource" maxOccurs="unbounded" minOccurs="0"/> 
      </xs:sequence> 
     </xs:complexType> 
     </xs:element> 
     ... 
    </xs:sequence> 

    </xs:complexType> 

 

---

我將如何設置這個名單，如果其他 類是不可序列？

content屬性的允許內容是JAXBElement<ResourceType>和String。 Serializable是這兩種類型的通用接口，比Object稍微有一些限制。

@XmlAccessorType(XmlAccessType.FIELD) 
@XmlType(name = "", propOrder = { 
    "content" 
}) 
public static class Classes { 

    @XmlElementRef(name = "Resource", type = JAXBElement.class) 
    @XmlMixed 
    protected List<Serializable> content; 

    /** 
    * Gets the value of the content property. 
    * 
    * <p> 
    * 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 <CODE>set</CODE> method for the content property. 
    * 
    * <p> 
    * For example, to add a new item, do as follows: 
    * <pre> 
    * getContent().add(newItem); 
    * </pre> 
    * 
    * 
    * <p> 
    * Objects of the following type(s) are allowed in the list 
    * {@link JAXBElement }{@code <}{@link ResourceType }{@code >} 
    * {@link String } 
    * 
    * 
    */ 
    public List<Serializable> getContent() { 
     if (content == null) { 
      content = new ArrayList<Serializable>(); 
     } 
     return this.content; 
    } 

} 

UPDATE

下面的例子可能會有幫助：

package example; 

import javax.xml.bind.JAXBContext; 
import javax.xml.bind.JAXBElement; 
import javax.xml.bind.Marshaller; 
import javax.xml.namespace.QName; 

import example.ResourcesType.Classrooms; 

public class Demo { 

    public static void main(String[] args) throws Exception { 
     // This is the ObjectFactory that was generated by XJC 
     ObjectFactory objectFactory = new ObjectFactory(); 

     // You can instantiate objects using the constructors 
     ResourcesType resourcesType = new ResourcesType(); 

     // You can instantiate objects using the ObjectFactory 
     Classrooms classRooms = objectFactory.createResourcesTypeClassrooms(); 
     resourcesType.setClassrooms(classRooms); 

     // You can use the ObjectFactory to wrap an object in a JAXBElement 
     ResourceType resourceType1 = new ResourceType(); 
     JAXBElement<ResourceType> jaxbElement1 = objectFactory.createResourcesTypeClassesResource(resourceType1); 
     classRooms.getContent().add(jaxbElement1); 

     ResourceType resourceType2 = objectFactory.createResourceType(); 
     JAXBElement<ResourceType> jaxbElement2 = objectFactory.createResourcesTypeClassesResource(resourceType2); 
     classRooms.getContent().add(jaxbElement2); 

     // You can create a JAXBContext on the package name of your generated classes 
     JAXBContext jc = JAXBContext.newInstance("example"); 

     Marshaller marshaller = jc.createMarshaller(); 
     marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); 

     // You can also create an instance of JAXBElement without using the ObjectFactory 
     JAXBElement<ResourcesType> rootElement = new JAXBElement<ResourcesType>(new QName("root"), ResourcesType.class, resourcesType); 
     marshaller.marshal(rootElement, System.out); 
    } 

}