Java HTML / XML How to - Obtain Java Class name from QName

Question

We would like to know how to obtain Java Class name from QName.

Answer

/* w  w w.  j a v  a  2 s  .  c o m*/
package example;
import java.util.HashMap;
import java.util.Map;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBIntrospector;
import javax.xml.namespace.QName;

public class Main {

    public static void main(String[] args) throws Exception {
        Class[] classes = new Class[3];
        classes[0] = A.class;
        classes[1] = B.class;
        classes[2] = C.class;

        JAXBContext jc = JAXBContext.newInstance(classes);

        JAXBIntrospector ji = jc.createJAXBIntrospector();
        Map<QName, Class> classByQName = new HashMap<QName, Class>(classes.length);
        for(Class clazz : classes) {
            QName qName = ji.getElementName(clazz.newInstance());
            if(null != qName) {
                classByQName.put(qName, clazz);
            }
        }

        QName qName = new QName("http://www.example.com", "EH");
        System.out.println(classByQName.get(qName));
    }

}

A.java

package example;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="EH", namespace="http://www.example.com")
public class A {
}

B.java

package example;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="BEE", namespace="urn:example")
public class B {
}

C.java

package example;

public class C {
}