JAXB - List<Serializable>?

问题

I made some classes using xjc.

    public class MyType {

    @XmlElementRefs({
        @XmlElementRef(name = "MyInnerType", type = JAXBElement.class, required = false),

    })
    @XmlMixed
    protected List<Serializable> content;

    public List<Serializable> getContent() {
        if (content == null) {
            content = new ArrayList<Serializable>();
        }
        return this.content;
    }
}

But i cant add inner elements using

getContent().add(newItem);

because MyInnerType is not Serializable. Why its not a List of Objects? How do i add inner elements?

回答1:

Please take a look here and here (one should for sure address your scenario).

From 2nd link:

<!-- schema fragment having  mixed content -->
<xs:complexType name="letterBody" mixed="true">
<xs:sequence>
    <xs:element name="name" type="xs:string"/>
    <xs:element name="quantity" type="xs:positiveInteger"/>
    <xs:element name="productName" type="xs:string"/>
    <!-- etc. -->
</xs:sequence>
</xs:complexType>
<xs:element name="letterBody" type="letterBody"/>


// Schema-derived Java code: 
// (Only annotations relevant to mixed content are shown below, 
//  others are ommitted.)
import java.math.BigInteger;
public class ObjectFactory {
    // element instance factories
    JAXBElement<LetterBody> createLetterBody(LetterBody value);
    JAXBElement<String>     createLetterBodyName(String value);
    JAXBElement<BigInteger> createLetterBodyQuantity(BigInteger value);
    JAXBElement<String>     createLetterBodyProductName(String value);
  // type instance factory
    LetterBody> createLetterBody();
}

public class LetterBody {
    // Mixed content can contain instances of Element classes
    // Name, Quantity and ProductName. Text data is represented as
    // java.util.String for text.
    @XmlMixed 
    @XmlElementRefs({
            @XmlElementRef(name="productName", type=JAXBElement.class),
            @XmlElementRef(name="quantity", type=JAXBElement.class),
            @XmlElementRef(name="name", type=JAXBElement.class)})
    List getContent(){...}
}

回答2:

What do you think you should be adding in there? I have used similar generation and had fields like this and the expectation was that it would be String content.

It'd probably help to show the xsd this was generated from.

来源：https://stackoverflow.com/questions/9081527/jaxb-listserializable