更新时间:2023-11-05 15:54:16
JAXB是一个规范,具体实现将提供扩展点来做这样的事情。如果您使用的是 EclipseLink JAXB(MOXy),则可以按如下方式修改Shape类: / p>
JAXB is a spec, specific implementations will provide extension points to do things such as this. If you are using EclipseLink JAXB (MOXy) you could modify the Shape class as follows:
import javax.xml.bind.annotation.XmlAttribute;
import org.eclipse.persistence.oxm.annotations.XmlCustomizer;
@XmlCustomizer(ShapeCustomizer.class)
public abstract class Shape {
int points;
@XmlAttribute
public int getPoints() {
return points;
}
public void setPoints(int points) {
this.points = points;
}
}
然后使用MOXy @XMLCustomizer你可以访问InheritancePolicy并将类指示符字段从@xsi:type更改为type:
Then using the MOXy @XMLCustomizer you could access the InheritancePolicy and change the class indicator field from "@xsi:type" to just "type":
import org.eclipse.persistence.config.DescriptorCustomizer;
import org.eclipse.persistence.descriptors.ClassDescriptor;
public class ShapeCustomizer implements DescriptorCustomizer {
@Override
public void customize(ClassDescriptor descriptor) throws Exception {
descriptor.getInheritancePolicy().setClassIndicatorFieldName("@type");
}
}
您需要确保拥有jaxb。属性文件包含模型类(Shape,Square等),以及指定EclipseLink MOXy JAXB实现的以下条目:
You will need to ensure that you have a jaxb.properties file in with you model classes (Shape, Square, etc) with the following entry specifying the EclipseLink MOXy JAXB implementation:
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
以下是其余的模型类:
形状
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Shapes {
private List<Shape> shape = new ArrayList<Shape>();;
public List<Shape> getShape() {
return shape;
}
public void setShape(List<Shape> shape) {
this.shape = shape;
}
}
Square
import javax.xml.bind.annotation.XmlAttribute;
public class Square extends Shape {
private String squareSpecificAttribute;
@XmlAttribute(name="square-specific-attribute")
public String getSquareSpecificAttribute() {
return squareSpecificAttribute;
}
public void setSquareSpecificAttribute(String s) {
this.squareSpecificAttribute = s;
}
}
Triangle
import javax.xml.bind.annotation.XmlAttribute;
public class Triangle extends Shape {
private String triangleSpecificAttribute;
@XmlAttribute(name="triangle-specific-attribute")
public String getTriangleSpecificAttribute() {
return triangleSpecificAttribute;
}
public void setTriangleSpecificAttribute(String t) {
this.triangleSpecificAttribute = t;
}
}
以下是要检查的演示程序一切正常:
Below is a demo program to check that everything works:
import java.io.StringReader;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jaxbContext = JAXBContext.newInstance(Shapes.class, Triangle.class, Square.class);
StringReader xml = new StringReader("<shapes><shape square-specific-attribute='square stuff' type='square'><points>4</points></shape><shape triangle-specific-attribute='triangle stuff' type='triangle'><points>3</points></shape></shapes>");
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
Shapes root = (Shapes) unmarshaller.unmarshal(xml);
Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(root, System.out);
}
}
我希望这会有所帮助。
有关EclipseLink MOXy的更多信息,请参阅:
For more information on EclipseLink MOXy see:
编辑
在EclipseLink 2.2中,我们让这更容易配置,请查看以下文章了解更多信息信息:
In EclipseLink 2.2 we're making this easier to configure, check out the following article for more information: