How to make a redirection on page load in JSF 1 x

Question

I have a web-application where the users can be sent directly to some specific pages  such as a page where he can view or edit an item   To achieve that  we provide a specific url  These urls are located outside the current web-application  i e  they can be present in another web-application  or in an email    The url looks like http   myserver my-app forward jsf action XXX amp param YYY  where    action represents the page where the user will be redirected  You can consider this as the from-outcome of any JSF action in navigation-case in faces-config xml  actionParam is a parameter for the previous action  generally an item ID    So for example  I can have these kind of urls    http   myserver my-app forward jsf action viewItem amp actionParam 1234 http   myserver my-app forward jsf action editItem amp actionParam 1234   Of course  I have a Java class  bean  that will check some security constraints  i e  is the user allowed to see   edit the corresponding item   and then redirect the user to the correct page  such as edit xhtml  view xhtml or access-denied xhtml      Current implementation  Currently  we have a basic way to accomplish the forward  When the user clicks on the link  the following XHTML page is called    lt html gt       lt body id  forwardForm  gt           lt h inputHidden id  myAction  binding    forwardBean hiddenAction    gt           lt h inputHidden id  myParam  binding    forwardBean hiddenActionParam    gt           lt h commandButton id  forwardBtn  actionListener    forwardBean doForward   style  display  none    gt       lt  body gt       lt script type  text javascript  gt          document getElementById  forwardForm forwardBtn   click         lt  script gt   lt  html gt    As you can see  I bind two  lt h inputHidden gt  components in my Java bean  They will be used to store the value of both action and actionParam request parameter  using FacesContext getCurrentInstance   getExternalContext   getRequestParameterMap   get  actiontParam      I also provide the doForward method that which will be called immediately when the page is rendered  which will redirect  again  the user to the real page  The method is   public void doForward ActionEvent evt        FacesContext facesContext   FacesContext getCurrentInstance        String redirect      define the navigation rule that must be used in order to redirect the user to the adequate page        NavigationHandler myNav   facesContext getApplication   getNavigationHandler        myNav handleNavigation facesContext  null  redirect         This solution is working  but I have two problems with that    I don t like the way it is implemented  I m sure that I can have something simplier  using a Servlet    This solution is using Javascript  and I must not use Javascript  as this forward may be used by old Blackberry users  where the Javascript is not supported     So my question is how to refactor this redirection   forward feature   Technical information  Java 1 6  JSF 1 2  Facelets  Richfaces

User · Answer

Assume that foo jsp is your jsp file  and following code is the button that you want do redirect    lt h commandButton value  Redirect  action    trial enter     gt      And now we ll check the method for directing in your java  service  class   public String enter                 if  userName equals  xyz    amp  amp  password equals  123                      return  enter                 else                   return null                             and now this is a part of faces-config xml file      lt managed-bean gt           lt managed-bean-name gt  class name  lt  managed-bean-name gt           lt managed-bean-class gt  package name  lt  managed-bean-class gt           lt managed-bean-scope gt request lt  managed-bean-scope gt       lt  managed-bean gt         lt navigation-case gt                   lt from-outcome gt enter lt  from-outcome gt                   lt to-view-id gt  foo jsp lt  to-view-id gt                   lt redirect   gt               lt  navigation-case gt

User · Answer

Edit 2  I finally found a solution by implementing my forward action like that   private void applyForward         FacesContext facesContext   FacesContext getCurrentInstance           Find where to redirect the user      String redirect   getTheFromOutCome            Change the Navigation context      NavigationHandler myNav   facesContext getApplication   getNavigationHandler        myNav handleNavigation facesContext  null  redirect           Update the view root     UIViewRoot vr   facesContext getViewRoot        if  vr    null               Get the URL where to redirect the user         String url   facesContext getExternalContext   getRequestContextPath            url   url         vr getViewId   replace   xhtml     jsf            Object obj   facesContext getExternalContext   getResponse            if  obj instanceof HttpServletResponse                HttpServletResponse response    HttpServletResponse  obj              try                      Redirect the user now                  response sendRedirect response encodeURL url                  catch  IOException e                    e printStackTrace                                      It works  at least regarding my first tests   but I still don t like the way it is implemented    Any better idea     Edit This solution does not work  Indeed  when the doForward   function is called  the JSF lifecycle has already been started  and then recreate a new request is not possible     One idea to solve this issue  but I don t really like it  is to force the doForward   action during one of the setBindedInputHidden   method   private boolean actionDefined   false  private boolean actionParamDefined   false   public void setHiddenActionParam HtmlInputHidden hiddenActionParam        this hiddenActionParam   hiddenActionParam      String actionParam   FacesContext getCurrentInstance   getExternalContext   getRequestParameterMap   get  actionParam        this hiddenActionParam setValue actionParam       actionParamDefined   true      forwardAction       public void setHiddenAction HtmlInputHidden hiddenAction        this hiddenAction   hiddenAction      String action   FacesContext getCurrentInstance   getExternalContext   getRequestParameterMap   get  action        this hiddenAction setValue action       actionDefined   true      forwardAction       private void forwardAction         if   actionDefined     actionParamDefined               As one of the inputHidden was not binded yet  we do nothing            return               Now  both action and actionParam inputHidden are binded  we can execute the forward        doForward null       This solution does not involve any Javascript call  and works does not work

User · Answer

you should use action instead of actionListener     lt h commandLink id  close  action    bean close   value  Close  immediate  true                                        gt    and in close method you right something like   public String close        return  index faces-redirect true       where index is one of your pages index xhtml   Of course  all this staff should be written in our original page  not in the intermediate  And inside the close   method you can use the parameters to dynamically choose where to redirect

User · Answer

Set the GET query parameters as managed properties in faces-config xml so that you don t need to gather them manually    lt managed-bean gt       lt managed-bean-name gt forward lt  managed-bean-name gt       lt managed-bean-class gt com example ForwardBean lt  managed-bean-class gt       lt managed-bean-scope gt request lt  managed-bean-scope gt       lt managed-property gt           lt property-name gt action lt  property-name gt           lt value gt   param action  lt  value gt       lt  managed-property gt       lt managed-property gt           lt property-name gt actionParam lt  property-name gt           lt value gt   param actionParam  lt  value gt       lt  managed-property gt   lt  managed-bean gt    This way the request forward jsf action outcome1 amp actionParam 123 will let JSF set the action and actionParam parameters as action and actionParam properties of the ForwardBean   Create a small view forward xhtml  so small that it fits in default response buffer  often 2KB  so that it can be resetted by the navigationhandler  otherwise you ve to increase the response buffer in the servletcontainer s configuration   which invokes a bean method on beforePhase of the f view    lt  DOCTYPE html gt   lt html xmlns f  http   java sun com jsf core  gt       lt f view beforePhase    forward navigate     gt   lt  html gt    The ForwardBean can look like this   public class ForwardBean       private String action      private String actionParam       public void navigate PhaseEvent event            FacesContext facesContext   FacesContext getCurrentInstance            String outcome   action     Do your thing          facesContext getApplication   getNavigationHandler   handleNavigation facesContext  null  outcome                 Add generate the usual boilerplate      The navigation-rule speaks for itself  note the  lt redirect   gt  entries which would do ExternalContext redirect   instead of ExternalContext dispatch   under the covers     lt navigation-rule gt       lt navigation-case gt           lt from-outcome gt outcome1 lt  from-outcome gt           lt to-view-id gt  outcome1 xhtml lt  to-view-id gt           lt redirect   gt       lt  navigation-case gt       lt navigation-case gt           lt from-outcome gt outcome2 lt  from-outcome gt           lt to-view-id gt  outcome2 xhtml lt  to-view-id gt           lt redirect   gt       lt  navigation-case gt   lt  navigation-rule gt      An alternative is to use forward xhtml as   lt  DOCTYPE html gt   lt html gt   forward  lt  html gt    and update the navigate   method to be invoked on  PostConstruct  which will be invoked after bean s construction and all managed property setting     PostConstruct public void navigate                        It has the same effect  however the view side is not really self-documenting  All it basically does is printing ForwardBean toString    and hereby implicitly constructing the bean if not present yet      Note for the JSF2 users  there is a cleaner way of passing parameters with  lt f viewParam gt  and more robust way of handling the redirect navigation by  lt f event type  preRenderView  gt   See also among others    Hit a bean method and redirect on a GET request Is there any easy way to preprocess and redirect GET requests

User · Answer

FacesContext context   FacesContext getCurrentInstance    HttpServletResponse response    HttpServletResponse context getExternalContext   getResponse    response sendRedirect  somePage jsp

[java] How to make a redirection on page load in JSF 1.x

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