在将对象序列化为XML时如何添加XML命名空间（xmlns） [英] How to add an XML namespace (xmlns) when serializing an object to XML

问题描述

我在XStream的帮助下将对象序列化为XML。
如何告诉XStream将xmlns插入到对象的XML输出中？

I'm serializing Objects to XML with the help of XStream. How do I tell XStream to insert an xmlns to the XML output of my object?

作为一个例子，我有这个想要序列化的简单对象：

As an example, I have this simple object I want to serialize:

@XStreamAlias(value="domain")
public class Domain
{
    @XStreamAsAttribute
    private String type;

    private String os;

    (...)
}

我如何用XStream实现完全以下输出？

How do I achieve exactly the following output with XStream?

<domain type="kvm" xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0">
  <os>linux</os>
</domain>

推荐答案

或者，这个用例可以很容易地处理JAXB实现（ Metro ， EclipseLink MOXy ， Apache JaxMe 等）：

Alternatively, this use case could be handled quite easily with a JAXB implementation (Metro, EclipseLink MOXy, Apache JaxMe, etc):

域

package com.example;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Domain
{
    private String type;
    private String os;

    @XmlAttribute
    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getOs() {
        return os;
    }

    public void setOs(String os) {
        this.os = os;
    }

}

package-info

@XmlSchema(xmlns={
        @XmlNs(
            prefix="qemu", 
            namespaceURI="http://libvirt.org/schemas/domain/qemu/1.0")
})
package com.example;

import javax.xml.bind.annotation.XmlNs;
import javax.xml.bind.annotation.XmlSchema;

演示

package com.example;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

public class Demo {

    public static void main(String[] args) throws JAXBException {
        JAXBContext jc = JAXBContext.newInstance(Domain.class);

        Domain domain = new Domain();
        domain.setType("kvm");
        domain.setOs("linux");

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(domain, System.out);
    }


}

输出

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" type="kvm">
    <os>linux</os>
</domain>

更多信息

• http：//bdoughan.blogspot。 com / 2010/08 / jaxb-namespaces.html


• http://bdoughan.blogspot.com/2010/10/how-does-jaxb-compare-to-xstream.html

• http://bdoughan.blogspot.com/2010/08/jaxb-namespaces.html
• http://bdoughan.blogspot.com/2010/10/how-does-jaxb-compare-to-xstream.html

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