Java:jaxb 泛型

Question

如何让 jaxb 绑定(bind)到我的 Vector？我似乎无法让它绑定(bind)包含泛型的 Vector，因为它提示它无法识别我的类“shape”或其任何子类型..“[javax.xml.bind.JAXBException:类 shape.shape 或其任何子类型”在此上下文中，父类(super class)是已知的。]"?

import java.util.Vector;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlAccessorType(XmlAccessType.NONE)
@XmlRootElement(name = "XVector")
public class XVector<shape> {

    private Vector<shape> q;

    public XVector() {}

    @XmlElement(name = "q")
    public Vector<shape> getVector() {
        return q;
    }

    public void setVector(Vector<shape> q) {
        this.q = q;
    }
}

我收到以下错误:

javax.xml.bind.MarshalException
 - with linked exception:
[javax.xml.bind.JAXBException: class shape.Rectangle nor any of its super class is known to this context.]
        at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:317)
        at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:243)
        at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:75)

<小时/>

public void saveFile(File filename) {
    try {
        FileOutputStream fout = new FileOutputStream(filename);
        objs.setVector(objVec);
        JAXBContext context = JAXBContext.newInstance(XVector.class);
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

        marshaller.marshal(objs, fout);
        fout.close();
    } catch (JAXBException e) {
       e.printStackTrace ();
    } catch (Exception ex) {
        JOptionPane.showMessageDialog(this, ex.toString(), "Error", JOptionPane.ERROR_MESSAGE);
    }
}

Answer 1

您应该在 JAXBContext 中包含所有必需的类

JAXBContext context = JAXBContext.newInstance(XVector.class, shape.class);

(注意:惯例规定 Shape 应大写)