Java使用JAXB对XML设置属性和属性值

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
    <soap12:Body>
    </soap12:Body>
</soap12:Envelope

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
        "body"
})
@XmlRootElement(name = "soap12:Envelope")
public class SoapEnvelope {
    @XmlElement(name = "soap12:Body")
    private SoapBody body;

    @XmlAttribute(name = "xmlns:xsi")
    private String xmlnsXsi;

    @XmlAttribute(name = "xmlns:xsd")
    private String xmlnsXsd;

    @XmlAttribute(name = "xmlns:soap12")
    private String xmlnsSoap;

    public SoapEnvelope() {
        this.xmlnsXsi = "http://www.w3.org/2001/XMLSchema-instance";
        this.xmlnsXsd = "http://www.w3.org/2001/XMLSchema";
        this.xmlnsSoap = "http://www.w3.org/2003/05/soap-envelope";
    }


    public SoapBody getBody() {
        return body;
    }

    public void setBody(SoapBody body) {
        this.body = body;
    }
}

@XmlElement(name = "soap12:Body")
private SoapBody body

@XmlAttribute(name = "xmlns:xsi")
private String xmlnsXsi