To delete cookies is very simple. If you want to delete a cookie, then you simply need to follow these three steps −
Read an already existing cookie and store it in Cookie object.
Set cookie age as zero using the setMaxAge() method to delete an existing cookie.
Add this cookie back into the response header.
Following example will show you how to delete an existing cookie named "first_name" and when you run main.jsp JSP next time, it will return null value for first_name.
Example
<html>
<head>
<title>Reading Cookies</title>
</head>
<body>
<center>
<h1>Reading Cookies</h1>
</center>
<%
Cookie cookie = null;
Cookie[] cookies = null;
// Get an array of Cookies associated with the this domain
cookies = request.getCookies();
if( cookies != null ) {
out.println("<h2> Found Cookies Name and Value</h2>");
for (int i = 0; i < cookies.length; i++) {
cookie = cookies[i];
if((cookie.getName( )).compareTo("first_name") == 0 ) {
cookie.setMaxAge(0);
response.addCookie(cookie);
out.print("Deleted cookie: " +
cookie.getName( ) + "<br/>");
}
out.print("Name : " + cookie.getName( ) + ", ");
out.print("Value: " + cookie.getValue( )+" <br/>");
}
} else {
out.println(
"<h2>No cookies founds</h2>");
}
%>
</body>
</html>Let us now put the above code in the main.jsp file and try to access it. It will display the following result −
Output
Cookies Name and Value Deleted cookie : first_name Name : first_name, Value: John Name : last_name, Value: Player
Now run https://localhost:8080/main.jsp once again and it should display only one cookie as follows −
Found Cookies Name and Value Name : last_name, Value: Player
You can delete your cookies in the Internet Explorer manually. Start at the Tools menu and select the Internet Options. To delete all cookies, click the Delete Cookies button.