实施“XML元素”使用莫西

Question

我想知道如何实现使用的EclipseLink莫西，
之前，使用JAXB接口类型具有列表，下面的注释做了工作

class A { 

    @XmlElements({ 
     @XmlElement(name = "B1", type = B1.class), 
     @XmlElement(name = "B2", type = B2.class) 
    }) 
    List<B> list; 

} 

interface B{} 

class B1 implements B {} 

class B2 implements B {} 

支持接口类型列表???

Answer 1

我领导EclipseLink JAXB (MOXy)。我无法重现您的问题。你能提供你看到的堆栈跟踪吗？下面是我曾尝试：

演示

import java.io.File; 

import javax.xml.bind.JAXBContext; 
import javax.xml.bind.JAXBElement; 
import javax.xml.bind.Marshaller; 
import javax.xml.bind.Unmarshaller; 
import javax.xml.transform.stream.StreamSource; 

import org.eclipse.persistence.Version; 

public class Demo { 

    public static void main(String[] args) throws Exception { 
     System.out.println(Version.getVersionString()); 

     JAXBContext jc = JAXBContext.newInstance(A.class, B1.class, B2.class); 
     System.out.println(jc); 

     File xml = new File("input.xml"); 
     Unmarshaller unmarshaller = jc.createUnmarshaller(); 
     JAXBElement<A> root = unmarshaller.unmarshal(new StreamSource(xml), A.class); 

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

} 

jaxb.properties

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory 

的input.xml

<?xml version="1.0" encoding="UTF-8"?> 
<root> 
    <B1/> 
    <B2/> 
</root> 

输出

2.2.0.v20110202-r8913 
org.eclipse.persistence.jaxb.JAXBContext@11ddcde 
<?xml version="1.0" encoding="UTF-8"?> 
<root> 
    <B1/> 
    <B2/> 
</root> 

---

使用的EclipseLink JAXB（MOXY）的XML元数据文件

MOXY还具有延伸部，以提供所述元数据为XML文件。下面是它会是什么样子的这个例子：

<?xml version="1.0"?> 
<xml-bindings 
    xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm" 
    package-name="com.example"> 
    <java-types> 
     <java-type name="A"> 
      <java-attributes> 
       <xml-elements java-attribute="list"> 
        <xml-element name="B1" type="com.example.B1"/> 
        <xml-element name="B2" type="com.example.B2"/> 
       </xml-elements> 
      </java-attributes> 
     </java-type> 
    </java-types> 
</xml-bindings> 

创建的JAXBContext时，该元数据文件传过来的属性：

Map<String, Object> properties = new HashMap<String, Object>(1); 
properties.put(JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY, new File("src/forum149/bindings.xml")); 
JAXBContext jc = JAXBContext.newInstance(new Class[] {A.class, B1.class, B2.class}, properties); 

欲了解更多信息，请参阅：

• http://bdoughan.blogspot.com/2010/12/extending-jaxb-representing-annotations.html