How to set the default namespace using JAXB

问题:

I have a ATOM-XML representation of my data that is returned via a Spring MVC web service. I'm using JAXB to do the serialization, I have a number of namespaces but I want the default namespace set to Atom with no prefix. Here is what I have so far in package-info.java but the atom prefix is being set to ns3.

@XmlSchema(namespace = com.mycomponay.foo.ATOM_NAMESPACE,
xmlns = { 
    @XmlNs(prefix = "foo", namespaceURI = com.mycomponay.foo.NAMESPACE_FOO),
}, elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
package com.mycompany.web;

import javax.xml.bind.annotation.XmlNs;

Also I noticed the namespaces display in chrome but not in Firefox.

回答1:

Try adding an @XmlNs annotation with prefix "" for the namespace you want to appear as the default.

@XmlSchema(
    namespace = com.mycompany.foo.ATOM_NAMESPACE,
    xmlns = { 
        @XmlNs(prefix = "", namespaceURI = com.mycompany.foo.ATOM_NAMESPACE),
        @XmlNs(prefix = "foo", namespaceURI = com.mycompany.foo.NAMESPACE_FOO)
    }, 
    elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
package com.mycompany.web;

import javax.xml.bind.annotation.*;

Note:

The namespaces specified in the @XmlSchema annotation are meant to affect the generation of the XML Schema and are not guaranteed to be used when a object model is marshalled to XML. However EclipseLink JAXB (MOXy) and recent versions of the JAXB reference implementation will use them whenever possible.

For More Information

• http://blog.bdoughan.com/2011/11/jaxb-and-namespace-prefixes.html

回答2:

if you are using separate class for XML element, annotate it with namespace="", would work.