JAXB：限定属性禁用默认命名空间 xmlns= " " ？

Question

当我使用@XmlSchema(attributeFormDefault = XmlNsForm.QUALIFIED, ...)

或@XmlAttribute(namespace = "sample.com/y", ...)

JAXB忽略@XmlSchema(namespace = "sample.com/x", ...)

而不是:

<a xmlns="sample.com/y" xmlns:ns0="sample.com/y">
  <b ns0:att=""/>
</a>

生成如下:

<ns1:a xmlns:ns1="sample.com/x" xmlns:ns0="sample.com/y">
  <ns1:b ns0:att=""/>
</ns1:a>

这是预期的行为吗?有什么办法可以纠正吗?

Answer 1

EclipseLink JAXB (MOXy)正在根据属性形式限定不同地处理元素的前缀限定(如下所示)。

名称空间限定没有错，但我同意在可能的情况下使用默认名称空间更好。您可以使用以下错误跟踪此问题的进展:

• https://bugs.eclipse.org/353042

package forum6808921;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class A {
    private String b;
    public String getB() {
        return b;
    }
    public void setB(String b) {
        this.b = b;
    }
}

package forum6808921;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
public class Demo {
    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(A.class);
        A a = new A();
        a.setB("Hello World");
        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(a, System.out);
    }
}

package-info without attributeFormDefault set

@XmlSchema(
        namespace = "sample.com/x"
        , elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
        )
package forum6808921;
import javax.xml.bind.annotation.*;

输出:

<?xml version="1.0" encoding="UTF-8"?>
<a xmlns="sample.com/x">
   <b>Hello World</b>
</a>

package-info with attributeFormDefault set

@XmlSchema(
        namespace = "sample.com/x"
        , elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
        , attributeFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
        )
package forum6808921;
import javax.xml.bind.annotation.*;

输出:

<?xml version="1.0" encoding="UTF-8"?>
<ns0:a xmlns:ns0="sample.com/x">
   <ns0:b>Hello World</ns0:b>
</ns0:a>