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<listener>
        <listener-class>
                org.directwebremoting.servlet.EfficientShutdownServletContextAttributeListener
       </listener-class>
</listener>
<listener>
    <listener-class>org.directwebremoting.servlet.EfficientShutdownServletContextListener</listener-class>
</listener>
<listener>
    <listener-class>CheckSessionDwrServletContextListener</listener-class>
</listener>
<servlet>
        <servlet-name>dwr-invoker</servlet-name>
        <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>true</param-value>
        </init-param>
        <!--¼¤»îÂÖѯºÍComet¹¦ÄÜ-->
        <init-param>
            <param-name>activeReverseAjaxEnabled</param-name>
            <param-value>true</param-value>
        </init-param>
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<html>
    <head>
        <title>My JSP ''upload.jsp'' starting page</title>
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<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
   <title>xmlhttprequest ajax demo</title>
    <script type ="text/javascript" language ="javascript" >
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var xmlhttp;
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