Can not be saved in the session, and before I save in request, here session can also get Chain.dofilter (request, response); Only the login name is not empty when the release, prevent direct login Successful page

public void DoFilter (ServletRequest request, servletresponse response,
Filterchain chain) throws IOException, Servletexception {
HttpServletRequest HttpRequest = (httpservletrequest) request;
HttpServletResponse HttpResponse = (httpservletresponse) response;

HttpSession session = Httprequest.getsession ();
Can not be saved in the session, and before I save in request, here session can also get
if (Httprequest.getattribute ("username")!=null) {
Chain.dofilter (request, response); Only the login name is not empty when the release, prevent direct login Successful page
}else{
Httpresponse.sendredirect ("login.jsp");
}
}

<Filter>        <Filter-name>Loginfilter</Filter-name>        <Filter-class>Filter. Loginfilter</Filter-class>    </Filter>    <filter-mapping>        <Filter-name>Loginfilter</Filter-name>        <Url-pattern>/success.jsp</Url-pattern>    </filter-mapping>

Note that this/success.jsp is the page we would like to log in to, just before you log in to the page you want to log in, just configure one of the above filter.

Can not be saved in the session, and before I save in request, here session can also get Chain.dofilter (request, response); Only the login name is not empty when the release, prevent direct login Successful page