I want to change "javax.xml.datatype.XMLGregorianCalendar" to "java.util.Date" when unmarshalling from xml to Java class of JAXB.
But I don't put any annotations of @XmlJavaTypeAdapter in Java classes.
So, I'm going to try to use an annotation of @XmlJavaTypeAdapters, but I don't know how to use it...
Please show me examples for using it.
As an interesting aside, you don't actually need to adapt XMLGregorianCalendar to Date, since JAXB supports java.util.Date natively -- like this:
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement
public class Example {
@XmlSchemaType(name = "date")
public Date publishingDate;
}
If you need it, @XmlJavaTypeAdapter can work like this, assuming your custom class:
public class SillyDate {
public SillyDate(int year, int month, int day) {
super();
this.year = year;
this.month = month;
this.day = day;
}
public String toString() {
return "SillyDate [year=" + year + ", month=" + month + ", day=" + day + "]";
}
public int year;
public int month;
public int day;
}
You need a class which JAXB can understand, and then write an adapter between that class and the custom class, like this:
public class SillyDateAdapter extends XmlAdapter<XMLGregorianCalendar, SillyDate> {
public SillyDate unmarshal(XMLGregorianCalendar val) throws Exception {
return new SillyDate(val.getYear(), val.getMonth(), val.getDay());
}
public XMLGregorianCalendar marshal(SillyDate val) throws Exception {
return DatatypeFactory.newInstance().newXMLGregorianCalendarDate(val.year, val.month, val.day, 0);
}
}
Now you can use that in your own classes, like this:
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement
public class Example2 {
@XmlSchemaType(name = "date")
@XmlJavaTypeAdapter(type=XMLGregorianCalendar.class,value =SillyDateAdapter.class)
public SillyDate publishingDate;
}
There are plenty of good examples of using the @XmlJavaTypeAdapter available on the net, like this one and this one, and several others. Happy adapting!
