How to maintain user username in Sites VF page once user logged in

Question

I am storing user information (firstname,lastname,username,email,password) in custom object.If user enter valid username and password in login page then user redirect to home page with username as parameter in URL. In home page, I am getting user details based on parameter.

String username = ApexPages.currentPage().getParameters().get('uname');
Sobject s=[Select fields from sObject Where username__c=:username];

If user remove the uname parameter from URL and refresh the page, then its not possible to get user details. But still user is logged in.

How to maintain logged in user username until user logout from the page (if user refresh the page without uname parameter).

Is there any way to achieve this using apex coding and custom object?

Answer 1

you can use cookies to store information and once user click on Logout button then simply clear the cookies

// A Visualforce controller class that creates a cookie
// used to keep track of how often a user displays a page
public class CookieController {
public CookieController() {
    Cookie counter = ApexPages.currentPage().getCookies().get('counter');

    // If this is the first time the user is accessing the page, 
    // create a new cookie with name 'counter', an initial value of '1', 
    // path 'null', maxAge '-1', and isSecure 'false'. 
    if (counter == null) {
        counter = new Cookie('counter','1',null,-1,false);
    } else {
    // If this isn't the first time the user is accessing the page
    // create a new cookie, incrementing the value of the original count by 1
        Integer count = Integer.valueOf(counter.getValue());
        counter = new Cookie('counter', String.valueOf(count+1),null,-1,false);
    }

    // Set the new cookie for the page
    ApexPages.currentPage().setCookies(new Cookie[]{counter});
}

// This method is used by the Visualforce action {!count} to display the current 
// value of the number of times a user had displayed a page. 
// This value is stored in the cookie.
public String getCount() {
    Cookie counter = ApexPages.currentPage().getCookies().get('counter');
    if(counter == null) {
        return '0';
    }
    return counter.getValue();
}

} You can also use Javascript cookies but keep in mind that

The setCookies method adds the prefix “apex__” to the cookie names. so in javascript cookies append apex__ .

javascript Cookies Example

function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays*24*60*60*1000));
    var expires = "expires="+d.toUTCString();
    document.cookie = cname + "=" + cvalue + "; " + expires;
}