System
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The following example creates a class, CookieController, which is used with a Visualforce page (see markup below) to update a counter each time a user displays a page. The number of times a user goes to the page is stored in a cookie.
// 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(); } }
// Test class for the Visualforce controller @isTest private class CookieControllerTest { // Test method for verifying the positive test case static testMethod void testCounter() { //first page view CookieController controller = new CookieController(); System.assert(controller.getCount() == '1'); //second page view controller = new CookieController(); System.assert(controller.getCount() == '2'); } }
<apex:page controller="CookieController"> You have seen this page {!count} times </apex:page>