如何解决JAXB XML适配器通过注释工作，而不通过setAdapter起作用
|| 我了解所有有关如何使用XMLAdapters转换不可映射的类型，或仅更改某些对象序列化/反序列化为XML的方式的知识。如果我使用批注（包级别或其他级别），则一切正常。问题是我试图更改第三方对象的表示形式，而我不能将源代码更改为（即，为了注入注释）。 考虑到Marshaller对象具有手动添加适配器的方法，这应该不成问题。不幸的是，无论我做什么，我都无法以这种方式将适配器设置为“插入”。例如，我有一个表示XYZ空间中的点（地心坐标）的类。我希望在生成的XML中将其转换为纬度/经度/纬度（大地坐标）。这是我的课程： 地心package testJaxb;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class GeocentricCoordinate {
// Units are in meters; see http://en.wikipedia.org/wiki/Geocentric_coordinates
private double x;
private double y;
private double z;
@XmlAttribute
public double getX() {
return x;
}
public void setX(double x) {
this.x = x;
}
@XmlAttribute
public double getY() {
return y;
}
public void setY(double y) {
this.y = y;
}
@XmlAttribute
public double getZ() {
return z;
}
public void setZ(double z) {
this.z = z;
}
}
package testJaxb;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
/**
* @see http://en.wikipedia.org/wiki/Geodetic_system
*/
@XmlRootElement
public class GeodeticCoordinate {
private double latitude;
private double longitude;
// Meters
private double altitude;
public GeodeticCoordinate() {
this(0,0);
}
public GeodeticCoordinate(double latitude,double longitude,double altitude) {
super();
this.latitude = latitude;
this.longitude = longitude;
this.altitude = altitude;
}
@XmlAttribute
public double getLatitude() {
return latitude;
}
public void setLatitude(double latitude) {
this.latitude = latitude;
}
@XmlAttribute
public double getLongitude() {
return longitude;
}
public void setLongitude(double longitude) {
this.longitude = longitude;
}
@XmlAttribute
public double getAltitude() {
return altitude;
}
public void setAltitude(double altitude) {
this.altitude = altitude;
}
}
package testJaxb;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.adapters.XmlAdapter;
/**
* One of our systems uses xyz coordinates to represent locations. Consumers of our XML would much
* prefer lat/lon/altitude. This handles converting between xyz and lat lon alt.
*
* @author ndunn
*
*/
public class GeocentricToGeodeticLocationAdapter extends XmlAdapter<GeodeticCoordinate,GeocentricCoordinate> {
@Override
public GeodeticCoordinate marshal(GeocentricCoordinate arg0) throws Exception {
// TODO: do a real coordinate transformation
GeodeticCoordinate coordinate = new GeodeticCoordinate();
coordinate.setLatitude(45);
coordinate.setLongitude(45);
coordinate.setAltitude(1000);
return coordinate;
}
@Override
public GeocentricCoordinate unmarshal(GeodeticCoordinate arg0) throws Exception {
// TODO do a real coordinate transformation
GeocentricCoordinate gcc = new GeocentricCoordinate();
gcc.setX(100);
gcc.setY(200);
gcc.setZ(300);
return gcc;
}
}
package testJaxb;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class ObjectWithLocation {
private GeocentricCoordinate location = new GeocentricCoordinate();
public GeocentricCoordinate getLocation() {
return location;
}
public void setLocation(GeocentricCoordinate location) {
this.location = location;
}
public static void main(String[] args) {
ObjectWithLocation object = new ObjectWithLocation();
try {
JAXBContext context = JAXBContext.newInstance(ObjectWithLocation.class,GeodeticCoordinate.class,GeocentricCoordinate.class);
Marshaller marshaller = context.createMarshaller();
marshaller.setAdapter(new GeocentricToGeodeticLocationAdapter());
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true);
marshaller.marshal(object,System.out);
}
catch (JAXBException jaxb) {
jaxb.printStackTrace();
}
}
}
<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>
<objectWithLocation>
<location z=\"0.0\" y=\"0.0\" x=\"0.0\"/>
</objectWithLocation>
package-info.java
@javax.xml.bind.annotation.adapters.XmlJavaTypeAdapters
({
@javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter(value=GeocentricToGeodeticLocationAdapter.class,type=GeocentricCoordinate.class),})
package package testJaxb;
<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>
<objectWithLocation>
<location longitude=\"45.0\" latitude=\"45.0\" altitude=\"1000.0\"/>
</objectWithLocation>
setAdapter
解决方法
Marshaller
setAdapter(XmlAdapter)
@XmlJavaTypeAdapter
marshaller.setAdapter(...)
.setAdapter(...)
JAXBContext
public class Test {
public static void main(String... args) {
JAXBContext context = JAXBContext.getInstance(Event.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
UserContext userContext = null; // fetch it from some where
unmarshaller.setAdapter(UserAdapter.class,new UserAdapter(userContext));
Event event = (Event) unmarshaller.unmarshal(..);
}
}
@XmlJavaTypeAdapter
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