How to save the valuestack when using the redirectaction result type

[maven apache]

Hi:
In my application I first use the chain result type for one
action:"loginSub".

If login success,user should be taken to the manager page.
This is the core content in struts.xml:

    <package name="default" extends="struts-default" namespace="/">
        .....
        <action name="loginSub" class="com.test.action.LoginAction">
            <result name="success" type="chain">
                <param name="actionName">manager</param>
                <param name="namespace">/secure</param>
            </result>
            <result name="input">/jsp/login.jsp</result>
            <result name="error">/jsp/login.jsp</result>
        </action>
    </package>

    <package name="sec" extends="struts-default" namespace="/secure">
        <action name="manager">
            <result>/jsp/secure/manager.jsp</result>
            <result name="input" type="chain">
                <param name="actionName">loginPage</param>
                <param name="namespace">/</param>
            </result>
        </action>
    </package>

It works,when user login,the page will show the content in the
/jsp/secure/manager.jsp.

However the value in the browser address bar is also something like:

http://localhost:8080/Test/loginSub.action.

So once user refresh this page,it will result in a relogin.

After read the struts2 tutorial,I found the result type of
"redirectAction",it will change the value of the Browser address bar.
I change the "loginSub" action:

        <action name="loginSub" class="com.test.action.LoginAction">
            <..... the authentication interceptor>...
            <result name="success" type="redirectAction">
                <param name="actionName">manager</param>
                <param name="namespace">/secure</param>
            </result>
            <result name="input">/jsp/login.jsp</result>
            <result name="error">/jsp/login.jsp</result>
        </action>

Now after login,the browser address bar will change to :

*http://localhost:8080/Test/secure/manager.action*

Now no matter how frequently user refresh the page,it will not cause a
relogin.

However I found that I can not get some properties in the LoginAction.

I have a struts tag in the manager.jsp:

*<s:property value="userBean.username">*

Now using the redirectAction result type,I have no idea to get this value.

Any ideas?

BWT:
1)what's the difference between "Dispatcher Result","Redirect
Result","Redirect Action Result" and "Chain Result"?
I read the contents at "....struts.apache.org/2.2.1/docs/result-types.html",but
I am not exactly sure its meaning.

2)My action "manager" is a authentication required action,so I add a
authentication interceptor for them.

But how about user enter the url directly like this:
*
http://localhost:8080/Test/jsp/secure/manager.jsp?*

If so ,I do not think the interceptor will work.

How do you guys slove this problem?