🧠 In Servlets, you work with cookies using the javax.servlet.http.Cookie class.

Here’s the full list of the main methods for working with cookies:

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🎯 Methods of the Cookie Class

Method	Purpose	Example
getName()	Get the cookie name	cookie.getName()
getValue()	Get the cookie value	cookie.getValue()
setValue(String value)	Set/change the cookie value	cookie.setValue("newValue")
getDomain()	Get the domain for the cookie	cookie.getDomain()
setDomain(String pattern)	Set the domain (e.g., .example.com)	cookie.setDomain(".example.com")
getPath()	Get the path for which the cookie is valid	cookie.getPath()
setPath(String uri)	Set the path (e.g., /shop)	cookie.setPath("/shop")
getMaxAge()	Get the lifetime of the cookie in seconds	cookie.getMaxAge()
setMaxAge(int expiry)	Set how long the cookie should live (in seconds)	cookie.setMaxAge(3600)
getSecure()	Check if cookie is sent only over HTTPS	cookie.getSecure()
setSecure(boolean flag)	Force cookie to be sent only over HTTPS	cookie.setSecure(true)
isHttpOnly()	Check if cookie is HttpOnly	cookie.isHttpOnly()
setHttpOnly(boolean isHttpOnly)	Set cookie as HttpOnly (inaccessible to JS)	cookie.setHttpOnly(true)
toString()	Get cookie info as a String	cookie.toString()

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🛠️ Other Important Servlet Methods for Working with Cookies

✅ From HttpServletResponse:
(Used for sending cookies to the client)

Method	Purpose
addCookie(Cookie cookie)	Add a cookie to the response

✅ From HttpServletRequest:
(Used for reading cookies sent by the client)

Method	Purpose
getCookies()	Returns an array of Cookie objects from the request

🚀 Full Mini Example:

✅ Setting a cookie:

Cookie cookie = new Cookie("userName", "Alice");
cookie.setMaxAge(60 * 60); // 1 hour
cookie.setPath("/"); // Make cookie available for entire app
cookie.setSecure(true); // Send only over HTTPS
cookie.setHttpOnly(true); // Prevent JavaScript access
response.addCookie(cookie);

✅ Reading cookies:

Cookie[] cookies = request.getCookies();
if (cookies != null) {
    for (Cookie cookie : cookies) {
        if ("userName".equals(cookie.getName())) {
            String value = cookie.getValue();
            // Use value
        }
    }
}

✅ Deleting a cookie:

Cookie cookie = new Cookie("userName", "");
cookie.setMaxAge(0); // 0 means delete immediately
cookie.setPath("/");
response.addCookie(cookie);

⚡ Quick Practical Tips:

Tip	Why
Always set a path (setPath("/"))	Otherwise, cookie might not be visible to all your pages
Use setHttpOnly(true) for sensitive cookies	Improves security (prevent XSS attacks)
Use setSecure(true) if your app uses HTTPS	Prevents cookie leakage over HTTP
Remember cookies are small!	Browsers limit cookie size (~4KB) and number of cookies

🔥 Quick Memory Trick:

“Cookies in servlets = Create (addCookie), Read (getCookies), Delete (setMaxAge(0)).” 🎯