如何使用javax.xml.bind.annotation在java中添加空白命名空间

我不熟悉SOAP服务，这是我的输出和java类的详细信息

如何在子类中添加空白<代码> XMLNs/COD>？< /P> 发出请求：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<sendEmail xmlns="http://ws.cns.channel.sendnotification.sdfsfds.com/">
    <EmailNotificationRequest>
        <requestHeader>
            <channel>fsdfs</channel>
            <subChannel>sdfds</subChannel>
            <systemName>sdfsd</systemName>
            <applicationName>dsfs</applicationName>
        </requestHeader>
    </EmailNotificationRequest>
</sendEmail>

请求头类

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "requestHeader", propOrder = {
    "channel",
    "subChannel",
    "agentID",
    "systemName",
    "applicationName",
    "hostID",
    "requestDate"
})

public class RequestHeader {
    @XmlElement(required = true)
    protected String channel;
    protected String subChannel;
    protected String agentID;
    @XmlElement(required = true)
    protected String systemName;
    protected String applicationName;
}

所需输入请求

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<sendEmail xmlns="http://ws.cns.channel.sendnotification.sdfsfds.com/">
    <EmailNotificationRequest>
        <requestHeader xmlns="">
            <channel>fsdfs</channel>
            <subChannel>sdfds</subChannel>
            <systemName>sdfsd</systemName>
            <applicationName>dsfs</applicationName>
        </requestHeader>
    </EmailNotificationRequest>
</sendEmail>

fsdfs
电双凸极
自卫队
DSF

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<sendEmail xmlns="http://ws.cns.channel.sendnotification.sdfsfds.com/">
    <EmailNotificationRequest>
        <requestHeader xmlns="">
            <channel>fsdfs</channel>
            <subChannel>sdfds</subChannel>
            <systemName>sdfsd</systemName>
            <applicationName>dsfs</applicationName>
        </requestHeader>
    </EmailNotificationRequest>
</sendEmail>