import com.sun.tools.internal.xjc.generator.annotation.spec.XmlAttributeWriter; //导入依赖的package包/类
/**
 * Annotate the attribute property 'field'
 */
private void annotateAttribute(JAnnotatable field) {
    CAttributePropertyInfo ap = (CAttributePropertyInfo) prop;
    QName attName = ap.getXmlName();

    // [RESULT]
    // @XmlAttribute(name="foo", required=true, namespace="bar://baz")
    XmlAttributeWriter xaw = field.annotate2(XmlAttributeWriter.class);

    final String generatedName = attName.getLocalPart();
    final String generatedNS = attName.getNamespaceURI();

    // Issue 570; always force generating name="" when do it when globalBindings underscoreBinding is set to non default value
    // generate name property?
    if(!generatedName.equals(ap.getName(false)) || !generatedName.equals(ap.getName(true)) || (outline.parent().getModel().getNameConverter() != NameConverter.standard)) {
        xaw.name(generatedName);
    }

    // generate namespace property?
    if(!generatedNS.equals("")) { // assume attributeFormDefault == unqualified
        xaw.namespace(generatedNS);
    }

    // generate required property?
    if(ap.isRequired()) {
        xaw.required(true);
    }
}