Add StartElement to JAXBContext marshal
I have an object x which I want to marshal into a file.
xml of x :
<x id="0"><f1>bla</f1><f2>bla </f2><f3>b开发者_StackOverflow中文版la</f3></x>
this part I figured out ... but if I have a list of x's which I want to write to a file.
but I want to start the file with
<z>
<y>
<k>
<x id="1"> ... </x>
<x id="2"> ... </x>
<x id="3"> ... </x>
</k>
</y>
</z>
is there anyway we can do this with marshel ?! add the z y and k then the list of x's and the close z y and k ?!
Thank you ...
You could leverage JAXB and StAX and do something like the following:
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.Marshaller;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamWriter;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(X.class);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
XMLOutputFactory xof = XMLOutputFactory.newFactory();
XMLStreamWriter xsw = xof.createXMLStreamWriter(System.out);
xsw.writeStartDocument();
xsw.writeStartElement("x");
xsw.writeStartElement("y");
xsw.writeStartElement("k");
X x1 = new X();
x1.setId(1);
JAXBElement<X> jaxbElement1 = new JAXBElement<X>(new QName("x1"), X.class, x1);
marshaller.marshal(jaxbElement1, xsw);
X x2 = new X();
x2.setId(1);
JAXBElement<X> jaxbElement2 = new JAXBElement<X>(new QName("x2"), X.class, x2);
marshaller.marshal(jaxbElement2, xsw);
X x3 = new X();
x3.setId(3);
JAXBElement<X> jaxbElement3 = new JAXBElement<X>(new QName("x3"), X.class, x3);
marshaller.marshal(jaxbElement3, xsw);
xsw.writeEndElement();
xsw.writeEndElement();
xsw.writeEndElement();
xsw.writeEndDocument();
}
}
Output
<?xml version='1.0' encoding='UTF-8'?><x><y><k><x1 id="1" /><x2 id="1" /><x3 id="3" /></k></y></x>
FORMATTING
To get some formatting you could do:
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.Marshaller;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamWriter;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(X.class);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
XMLOutputFactory xof = XMLOutputFactory.newFactory();
XMLStreamWriter xsw = xof.createXMLStreamWriter(System.out);
xsw.writeStartDocument();
xsw.writeCharacters("\n");
xsw.writeStartElement("x");
xsw.writeCharacters("\n\t");
xsw.writeStartElement("y");
xsw.writeCharacters("\n\t\t");
xsw.writeStartElement("k");
X x1 = new X();
x1.setId(1);
x1.setF1("x1f1");
JAXBElement<X> jaxbElement1 = new JAXBElement<X>(new QName("x1"), X.class, x1);
xsw.writeCharacters("\n\t\t\t");
marshaller.marshal(jaxbElement1, xsw);
X x2 = new X();
x2.setId(1);
x2.setF1("x2f1");
JAXBElement<X> jaxbElement2 = new JAXBElement<X>(new QName("x2"), X.class, x2);
xsw.writeCharacters("\n\t\t\t");
marshaller.marshal(jaxbElement2, xsw);
X x3 = new X();
x3.setId(3);
x3.setF1("x3f1");
JAXBElement<X> jaxbElement3 = new JAXBElement<X>(new QName("x3"), X.class, x3);
xsw.writeCharacters("\n\t\t\t");
marshaller.marshal(jaxbElement3, xsw);
xsw.writeCharacters("\n\t\t");
xsw.writeEndElement();
xsw.writeCharacters("\n\t");
xsw.writeEndElement();
xsw.writeCharacters("\n");
xsw.writeEndElement();
xsw.writeEndDocument();
}
}
Output
<?xml version='1.0' encoding='UTF-8'?>
<x>
<y>
<k>
<x1 id="1"><f1>x1f1</f1></x1>
<x2 id="1"><f1>x2f1</f1></x2>
<x3 id="3"><f1>x3f1</f1></x3>
</k>
</y>
</x>
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