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public void dofilter(servletrequest req, servletresponse res,
   filterchain chain) throws ioexception, servletexception {
   httpservletrequest request = (httpservletrequest) req;
   httpservletresponse response = (httpservletresponse) res;
   httpsession session=request.getsession();
   servletcontext application=session.getservletcontext();
   
      if(session.getattribute("usersession")==null)
      {
response.sendredirect("error/priv_error.jsp");
       return;
      }
      else
      {
       chain.dofilter(request, response);
      }

 }

web.xml中如下配置：

<filter>
      <filter-name>privfilter</filter-name>
      <filter-class>com.mypriv.filter.privfilter</filter-class>
   </filter>

<filter-mapping>
    <filter-name>privfilter</filter-name>
    <url-pattern>/resource/*</url-pattern>
</filter-mapping>