Program for Cookie Handling in JSP

The following example code demonstrates how to write a Cookie Handling in JSP.

Here is an example code for a JSP program to create, read, and delete cookies.

Create Cookie

<%
   Cookie cookie = new Cookie("user", "John Doe");
   cookie.setMaxAge(60 * 60 * 24 * 365); // 1 year
   response.addCookie(cookie);
%>

2. Read Cookie

<%
   Cookie[] cookies = request.getCookies();
   if (cookies != null) {
      for (Cookie cookie : cookies) {
         if (cookie.getName().equals("user")) {
            out.println("Cookie value: " + cookie.getValue());
         }
      }
   }
%>

3. Delete Cookie:

<%
   Cookie[] cookies = request.getCookies();
   if (cookies != null) {
      for (Cookie cookie : cookies) {
         if (cookie.getName().equals("user")) {
            cookie.setMaxAge(0);
            response.addCookie(cookie);
         }
      }
   }
%>

In this code, to create a cookie, a Cookie object is created with a name and value, and the maximum age of the cookie is set to 1 year. The cookie is then added to the response using the response.addCookie() method.

To read a cookie, the request.getCookies() method is used to retrieve all cookies associated with the request. The cookies are then looped through, and if a cookie with the name “user” is found, its value is printed to the page using the out.println() method.

To delete a cookie, the steps are similar to reading a cookie, except that the maximum age of the cookie is set to 0. This effectively deletes the cookie, as it will no longer be returned in subsequent requests.

Further Reading