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From Christoph Nenning <Christoph.Nenn...@lex-com.net>
Subject Re: Need help in fixing issue with Url refresh
Date Wed, 10 Jun 2015 08:04:58 GMT
Hi,


well, I would create more files for that:

- LoginAction
- login.jsp
- LoginManager
- UserDataAction
- userData.jsp


And flow would be like this:
- Send GET request to LoginAction
- LoginAction uses some result to show login.jsp (e.g. dispatcher-result, 
tiles, sitemesh, ...)
- login.jsp shows a login form
- when user submits that form a POST request is sent to LoginAction
- LoginAction uses LoginManager to check if user is valid
- LoginAction must somehow remember that user is logged in. It could put 
an object in http-session or set a custom cookie, ...
- LoginAction redirects to UserDataAction (by using a redirect-result)
- This causes the Browser to send a new GET request to UserDataAction
- UserDataAction checks that user is logged in (by checking the session, 
cookie, ...) and uses LoginManager to load user-data
- UserDataAction uses some result to show userData.jsp (again: e.g. 
dispatch, tiles, sitemesh, ...)
- userData.jsp uses struts tags and OGNL to display user-data which has 
been loaded into UserDataAction



That shows how the MVC-pattern is handled in struts:
- Action classes are controllers, all URLs point to actions
- Action classes use Logic classes (like LoginManager) and let them do 
busines logic
- JSPs are just used for the View part, they are only invoked through 
actions


It also shows how 'login to a web app' is usually done: by using session 
or cookies.



Regards,
Christoph




> From: Preetham Mallavarapu <preethamreddy.mallaarapu@gmail.com>
> To: Struts Users Mailing List <user@struts.apache.org>, 
> Date: 09.06.2015 17:49
> Subject: Re: Need help in fixing issue with Url refresh
> 
> Hi Christoph,
> 
> Thanks for your quick response..I am briefing the issue once again..
> 
> 
> The inital flow was like this before...
> 
> I have login.jsp(username and password) -> checkUser 
method(loginManager)->
> Method calls a function in DB class and gets the user details if exist - 
>
> returns success to strus.xml -> now user details gets displayed in UI 
page..
> 
> here the url comes as said before..
> http://localhost:8081/NewApp/checkUserLoginManager
> 
> and when I refresh it throws exception which might be due to calling the
> checkUsermethod..
> 
> After the suggestion I have used a redirectAction
> 
> I have login.jsp(username and password) -> checkUser 
method(loginManager)->
> Method calls a function in DB class and gets the user details if exist -
> >returns success to strus.xml ->now I have used a redirect action to
> another Action class which inturn redirects to homepage (but the problem 
is
> that it doesnt display the user details now) and the url issue got 
fixed..
> 
> Now the url is like below
> http://localhost:8081/ExamCentre/displayManager.action
> 
> 
> Now if I try to move the login validation to second action, I am unclear 
on
> how to pass the data from login.jsp to the second action..
> 
> 
> 
> The project is in initial stage so I have 2 action class one for
> registrtaion and one for login apart from the new one created for
> redirection.
> 
> 
> Below is my struts.xml for reference
> 
> 
> <action name="*LoginManager" class="com.project.manager.LoginManager"
> method="{1}">
>     <result name="displayLoginPage" type="redirect">
>     <param name="location">login.jsp</param>
>     </result>
> 
>                 <result name="studentHomePage" type="redirectAction">
>                   <param name="actionName">displayManager</param>
>                 </result>
>         </action>
>  <action name="displayManager" 
class="com.project.manager.DisplayManager">
> <result name="success">student/studentHomePage.jsp</result>
> </action>
> 
>                <action name="*RegistrationManager"
> class="com.project.manager.RegistrationManager" method="{1}">
> 
> 
>                 <result name="displayLoginPage">login.jsp</result>
>                 <result 
name="newUserRegistrationFailed">signup.jsp</result>
> 
>         </action>
> 
> 
> 
> 
> 
> Thanks,
> Hari Krishna
> 
> 
> 
> 
> On Tue, Jun 9, 2015 at 8:10 PM, Christoph Nenning <
> Christoph.Nenning@lex-com.net> wrote:
> 
> > > From: Preetham Mallavarapu <preethamreddy.mallaarapu@gmail.com>
> > > To: Struts Users Mailing List <user@struts.apache.org>,
> > > Date: 09.06.2015 16:27
> > > Subject: Re: Need help in fixing issue with Url refresh
> > >
> > > Hi Christoph,
> > >
> > > I have tried working in the way login-post-request (using
> > > redirectAction)..It successfully redirects to the required page but 
its
> > not
> > > displaying the data in that..
> > >
> > > ex:
> > >
> > > In jsP I have <s:text name="firstName"/>
> > >
> > > when I do without redirect it displays user first name but when I 
try
> > using
> > > redirectAction it shows *"firstName" instead of data..*
> > >
> > > I am not sure whether I have followed the correct process or not..
> > >
> > > could you kindly provide me an example where I can refer ..?
> > >
> > > Thanks,
> > > Hari Krishna
> > >
> >
> >
> > You can have a look at this CRUD sample:
> >
> > https://github.com/wolpi/struts2-crud-sample/tree/master/struts2-
> crud-sample/src/main/java/test/crudsample/actions
> >
> > Do you have just one action which handles all your pages or do you 
have
> > two different actions?
> > After a redirect you must load data from database.
> >
> >
> > Regards,
> > Christoph
> >
> >
> >
> > >
> > >
> > > On Mon, Jun 8, 2015 at 7:42 PM, Preetham Mallavarapu <
> > > preethamreddy.mallaarapu@gmail.com> wrote:
> > >
> > > > Thanks Christoph for the suggestion. I will give a try now.
> > > >
> > > > Thanks,
> > > > Hari Krishna
> > > >
> > > >
> > > > On Mon, Jun 8, 2015 at 4:25 PM, Christoph Nenning <
> > > > Christoph.Nenning@lex-com.net> wrote:
> > > >
> > > >> > From: Preetham Mallavarapu <preethamreddy.mallaarapu@gmail.com>
> > > >> > To: Struts Users Mailing List <user@struts.apache.org>,
> > > >> > Date: 08.06.2015 11:00
> > > >> > Subject: Need help in fixing issue with Url refresh
> > > >> >
> > > >> > Hi,
> > > >> >
> > > >> > I have a problem in my struts2 app when I try to refresh url
> > > >> >
> > > >> > Below is the url I am trying to refresh..
> > > >> >
> > > >> > when user logs in then the *checkUser* method will be called
in 
the
> > > >> > LoginManager class and if it is a successfull login the home

page
> > will
> > > >> be
> > > >> > called having the below one as the url..
> > > >> >
> > > >> > http://localhost:8081/NewApp/checkUserLoginManager
> > > >> >
> > > >> >
> > > >> > Now the problem is when I try to refresh the url it throws me

null
> > > >> pointer
> > > >> > exception..for me it looks like it is calling again the 
checkUser
> > > >> method..
> > > >> >
> > > >> > Now can someone help me on how to fix this?
> > > >> >
> > > >> > Thanks,
> > > >> > Hari Krishna
> > > >>
> > > >>
> > > >> hi,
> > > >>
> > > >> this sounds like you don't use a redirect but answer the
> > > >> login-post-request with html. When an user hits browser refresh 
the
> > post
> > > >> request ist submitted again but the action misses some data at 
this
> > time.
> > > >> I suggest to use a redirect after login to show the user start 
page.
> > > >>
> > > >>
> > > >> http://struts.apache.org/docs/redirect-action-result.html
> > > >>
> > > >>
> > > >> regards,
> > > >> Christoph
> > > >>
> > > >>
> > > >> This Email was scanned by Sophos Anti Virus
> > > >>
> > > >
> > > >
> >
> > This Email was scanned by Sophos Anti Virus
> >

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