Get Request and Session Parameters and Attributes from JSF pages

Question

I m using JSF with facelets and I need to get the request and session parameters inside the JSF page  In JSP pages I got this parameter like that     requestScope paramName   or    sessionScope paramName    But now after using JSF there are only beans and you can t get any value except bean attributes   NOTE  The session attributes what I need is auto filled using acegi security so I can t get any access to them   So what to do now

User · Answer

Are you sure you can t get access to request   session scope variables from a JSF page   This is what I m doing in our login page  using Spring Security    lt h outputText     rendered    param loginFailed    1 and SPRING SECURITY LAST EXCEPTION    null   gt       lt span class  msg-error  gt   SPRING SECURITY LAST EXCEPTION message  lt  span gt   lt  h outputText gt

User · Answer

You can also use a tool like OcpSoft s PrettyFaces to inject dynamic parameter values directly into JSF Beans

User · Answer

In the bean you can use session getAttribute  attributeName

User · Answer

You can get a request parameter id using the expression    lt h outputText value    param  id       gt     param   An immutable Map of the request parameters for this request  keyed by parameter name  Only the first value for each parameter name is included  sessionScope   A Map of the session attributes for this request  keyed by attribute name    Section 5 3 1 2 of the JSF 1 0 specification defines the objects that must be resolved by the variable resolver

User · Answer

Assuming that you already put your object as attribute on the session map of the current instance of the FacesContext from your managed-bean  you can get it from the JSF page by     lt h outputText value    sessionScope  yourObject        gt    If your object has a property  get it by    lt h ouputText value    sessionScope  yourObject   anyProperty      gt

User · Answer

You can like this      requestScope  paramName       sessionScope  paramName      Because requestScope or sessionScope is a Map object

User · Answer

You can also use a bean  request scoped is suggested  and directly access the context by way of the FacesContext   You can get the HttpServletRequest and HttpServletResposne objects by using the following code   HttpServletRequest req    HttpServletRequest FacesContext getCurrentInstance   getExternalContext   getRequest    HttpServletResponse res    HttpServletResponse FacesContext getCurrentInstance   getExternalContext   getResponse      After this  you can access individual parameters via getParameter paramName  or access the full map via getParameterMap   req object  The reason I suggest a request scoped bean is that you can use these during initialization  worst case scenario being the constructor  Most frameworks give you some place to do code at bean initialization time  and they will be done as your request comes in   It is  however  a bit of a hack     You may want to look into seeing if there is a JSF Acegi module that will allow you to get access to the variables you need

User · Answer

You can either use    lt h outputText value    param  id       gt  or    lt h outputText value    request getParameter  id       gt   However if you want to pass the parameters to your backing beans  using f viewParam is probably what you want   A view parameter is a mapping between a query string parameter and a model value     lt f viewParam name  id  value    blog entryId    gt   This will set the id param of the GET parameter to the blog bean s entryId field  See http   java dzone com articles bookmarkability-jsf-2 for the details

[session] Get Request and Session Parameters and Attributes from JSF pages

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