Access Cookies from different visualforce pages

Working with Cookie

This is the Cookie class
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/apex_classes_sites_cookie.htm

PageReference methods:-
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/apex_System_PageReference_methods.htm

For example;- I have 2 VF pages.

1. CookieTest1
2. CookieTest2

We will create cookies in CookieTest1 page level and access those cookies in CookieTest2 page level.

Below the code checkout.

1. CookieTest1

<apex:page controller="CookieTest1Controller">
<apex:form >
    <apex:commandButton value="Click" action="{!createCookies}"/>
</apex:form>
</apex:page>

Controller:-

public class CookieTest1Controller
{
    public CookieTest1Controller()
    {
    }
    public pagereference createCookies()
    {
        Account objAccount = [SELECT Id from Account limit 1];
        Cookie objCookies = new Cookie('accId',objAccount.Id ,null,-1,false);
        pagereference pg = new pagereference('/apex/CookieTest2');
        pg.setCookies(new Cookie[]{objCookies});
        return pg;
    }
}

Here we are creating cookie and setCookies.
After that we will get this cookie in second page.

2. CookieTest2

<apex:page controller="CookieTest2Controller">
    <apex:detail subject="{!AccId}"/>
</apex:page>

Controller:-

public class CookieTest2Controller
{
    public Id AccId {get;set;}
    public CookieTest2Controller()
    {
        Cookie counter = ApexPages.currentPage().getCookies().get('accId');
        AccId =  Id.valueOf(counter.getValue());
    }
}

Based on accId we will get the Account id which was stored in cookie.