增加文件下载的配置。

src/main/webapp/WEB-INF/web.xml

  	<servlet-class>org.jfw.web.servlet.fileupload.cached.CachedUploadServlet</servlet-class>
  	<load-on-startup>3</load-on-startup>
  </servlet>
  <servlet>
  	<servlet-name>FileDownload</servlet-name>
  	<servlet-class>com.ekexiu.portal.util.FileDownload</servlet-class>
  	<load-on-startup>4</load-on-startup>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>ajax</servlet-name>
    <servlet-name>resFileUploadServlet</servlet-name>
    <url-pattern>/ajax/resFileUpload</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>FileDownload</servlet-name>
    <url-pattern>/ajax/FileDownload</url-pattern>
  </servlet-mapping>
</web-app>