import java.io.File;
import java.util.List;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlID;
import javax.xml.bind.annotation.XmlIDREF;
import javax.xml.bind.annotation.XmlRootElement;
public class Main {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Graph.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
File xml = new File("input.xml");
Graph graph = (Graph) unmarshaller.unmarshal(xml);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(graph, System.out);
}
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public static class Graph {
@XmlElement(name = "vertex")
List<Vertex> vertexList;
@XmlElement(name = "edge")
List<Edge> edgeList;
}
@XmlAccessorType(XmlAccessType.FIELD)
public static class Edge {
@XmlAttribute
@XmlIDREF
Vertex end1;
@XmlAttribute
@XmlIDREF
Vertex end2;
}
@XmlAccessorType(XmlAccessType.FIELD)
public static class Vertex {
@XmlAttribute
@XmlID
String id;
@XmlAttribute
String color;
@XmlAttribute
Integer thickness;
}
}
Below is the input to and output from running the demo code.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<graph>
<vertex id="n1" color="red" thickness="2"/>
<vertex id="n2"/>
<edge end1="n1" end2="n2"/>
</graph>