java – JSF 2.0. Failed to get post parameters and cookies in prerenderview event handler

I'm trying to develop a service

The key is my index XHTML should get parameters (post and get) and cookies from HTTP request

I try to use it in combination with < F: metadata > and < F: event type = "prerenderview" > like this:

<f:Metadata>  
    <f:event type="preRenderView" listener="#{deConversation.start}"/>  
</f:Metadata>

deConversation. Code for start:

public void start(ComponentSystemEvent event) {
    System.out.println("checkLogin");
    HttpServletRequest request = SsoHelper.getRequest();
    String requestSessId = SsoHelper.getRequestSessionId(request);
    String requestRedirect = SsoHelper.getRequestRedirect(request);

    System.out.println("sessId " + requestSessId);

    if (requestRedirect == null || requestRedirect.isEmpty()) {
        requestRedirect = "self";
    }

    if (requestSessId != null) {
        trySessId(requestSessId,requestRedirect);
    }

    externalResourcesHandler.setExternalRedirect(requestRedirect);
    tryToBeginConversation();

    if (!isAuthorized()) {
        SsoHelper.performNavigation("auth");
    }
}

Ssohelper only provides such APIs:

public static String getRequestSessionId(HttpServletRequest request) {
    Map<String,Object> cookieMap = FacesContext.getCurrentInstance().getExternalContext().getRequestCookieMap();
    String requestDeSessionId = null;
    if (cookieMap.containsKey("de_session_id")) {
        requestDeSessionId = ((Cookie) cookieMap.get("de_session_id")).getValue();
    }
    return requestDeSessionId;
}

public static String getRequestRedirect(HttpServletRequest request) {
    return getRequestParam(request,"redirect","self");
}

public static String getRequestExternalCss(HttpServletRequest request) {
    return getRequestParam(request,"externalcss",null);
}

public static String getRequestParam(HttpServletRequest request,String name,String defaultValue) {
    String[] paramValues = HttpServletRequestHelper.getParamValues(request,name);
    String paramValue = null;
    if (paramValues != null && paramValues.length != 0) {
        paramValue = paramValues[0];
    }
    if(paramValue == null){
        paramValue = defaultValue;
    }
    return paramValue;
}

public static HttpServletRequest getRequest() {
    return (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
}

public static void performNavigation(String destination) {
    FacesContext context = FacesContext.getCurrentInstance();
    ConfigurableNavigationHandler handler = (ConfigurableNavigationHandler) context.getApplication().getNavigationHandler();
    handler.performNavigation(destination);
}

The point is that I can't get any post parameters or cookies in the method start() I can only get the get parameter

Use < F: event type = "prerenderview" >? Is it possible to read cookies and post parameters?

Solution

I think you should use @postconstruct to invoke the init method so that you can call init () before the page is rendered & use global variables to assign Session or Cookies values in variables so that you can fulfill your requirements.

Example:

@postconstruct
public void init(){
    // Your Response
    Map request = (Map)FacesContext.getCurrentInstance().getExternalContext().getResponse();
    request.get("Your Key");

    // Cookies
    Map cookie = FacesContext.getCurrentInstance().getExternalContext().getRequestCookieMap();
    cookie.get("Your Key");

    Map session = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
    session.get("Your Key"); 
}

Try this. I think it will help you