GWT、jcifs和多个登录提示

我们有一个gwt应用程序，它使用jcifs从我们的NT域中提取用户名。以下是我们的web.xml的剪辑：

<filter>
    <filter-name>NtlmHttpFilter</filter-name>
    <filter-class>com.xxx.gwt.server.MyNTLMFilter</filter-class>

    <init-param>
        <param-name>jcifs.netbios.wins</param-name>
        <param-value>192.168.109.20</param-value>
    </init-param>
    <init-param>
        <param-name>jcifs.smb.client.domain</param-name>
        <param-value>its</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>NtlmHttpFilter</filter-name>
    <url-pattern>/trunkui/greet</url-pattern>
</filter-mapping>

<!-- Servlets -->
<servlet>
    <servlet-name>greetServlet</servlet-name>
    <servlet-class>com.xxx.gwt.server.GreetingServiceImpl</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>greetServlet</servlet-name>
    <url-pattern>/trunkui/greet</url-pattern>
</servlet-mapping>

---

因此，我想对虚拟servlet进行某种调用，以执行域提示，但我不确定如何从gwt远程服务执行此操作。或者有没有更好的方法呢？

我想出来了。我构建了虚拟servlet，然后在客户端使用RequestBuilder对该servlet进行访问。然后，该servlet获取userprincipal。以下是客户端：

    RequestBuilder getNameRB = new RequestBuilder(RequestBuilder.GET,  "naming");
    getNameRB.setCallback( new RequestCallback() {

        @Override
        public void onResponseReceived(Request request, Response response) {
            loadUserName(response.getText());
        }

        @Override
        public void onError(Request request, Throwable exception) {
            Window.alert("Unable to authenticate user\n"+exception.getMessage());
            Window.Location.replace("http://ccc");
        }
    });
    try {
        getNameRB.send();
    } catch (RequestException e) {
        Window.alert(e.getMessage());
    }

    RequestBuilder getNameRB = new RequestBuilder(RequestBuilder.GET,  "naming");
    getNameRB.setCallback( new RequestCallback() {

        @Override
        public void onResponseReceived(Request request, Response response) {
            loadUserName(response.getText());
        }

        @Override
        public void onError(Request request, Throwable exception) {
            Window.alert("Unable to authenticate user\n"+exception.getMessage());
            Window.Location.replace("http://ccc");
        }
    });
    try {
        getNameRB.send();
    } catch (RequestException e) {
        Window.alert(e.getMessage());
    }