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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>
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