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JSP Cookies Handling

  • Cookies are the text files which are stored on the client machine.
  • They are used to track the information for various purposes.
  • It supports HTTP cookies using servlet technology
  • The cookies are set in the HTTP Header.
  • If the browser is configured to store cookies, it will keep information until expiry date.

Following are the cookies methods:

  • Public void setDomain(String domain)

    It is used to set the domain to which the cookie applies

  • Public String getDomain()

    It is used to get the domain to which cookie applies

  • Public void setMaxAge(int expiry)

    It sets the maximum time which should apply till the cookie expires

  • Public intgetMaxAge()

    It returns the maximum age of cookie

  • Public String getName()

    It returns the name of the cookie

  • Public void setValue(String value)

    Sets the value associated with the cookie

  • Public String getValue()

    Get the value associated with the cookie

  • Public void setPath(String path)

    It sets the path to which cookie applies

  • Public String getPath()

    It gets the path to which the cookie applies

  • Public void setSecure(Boolean flag)

    It should be sent over encrypted connections or not.

  • Public void setComment(String cmt)

    It describes the cookie purpose

  • Public String getComment()

    It the returns the cookie comments which has been described.

Cookie Set-up using following steps:

  1. Creating the cookie object
  2. Setting the maximum age
  3. Sending the cookie in HTTP response headers

Example:

In this example, we are creating cookies of username and email and add age to the cookie for 10 hours and trying to get the variable names in the action_cookie.jsp

Action_cookie.jsp.

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Guru Cookie</title>
</head>
<body>
<form action="action_cookie_main.jsp" method="GET">
Username: <input type="text" name="username">
<br />
Email: <input type="text" name="email" />
<input type="submit" value="Submit" />
</form>
</body>
</html>

Action_cookie_main.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
         
   Cookie username = new Cookie("username",
 			  request.getParameter("username"));
   Cookie email = new Cookie("email",
			  request.getParameter("email"));

   
   username.setMaxAge(60*60*10); 
   email.setMaxAge(60*60*10); 

   // Add both the cookies in the response header.
   response.addCookie( username );
   response.addCookie( email );
%>


<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Guru Cookie JSP</title>
</head>
<body>

<b>Username:</b>
   <%= request.getParameter("username")%>
<b>Email:</b>
   <%= request.getParameter("email")%>

</body>
</html>

Explanation of the code:

Action_cookie.jsp

Code Line 10-15: Here we are taking a form which has to be processed in action_cookie_main.jsp. Also, we are taking two fields "username" and "email" which has to be taken input from the user with a submit button.

Action_cookie_main.jsp

Code Line 6-9: Creating two cookie objects of "username" and "email" using request.getParameter.

Code Line 12-13: Here we are adding age to both the cookies, which have been created of 10 hours i.e. cookies will expire in that age.

Code Line 16-17: Adding cookies to the session of username and email and these two cookies can fetched when requested by getParameter().

When you execute the above code you get the following output:

JSP Action - File Upload, JSP Filter, Client Request, Server Response, Cookies Handling, Date Handling

JSP Action - File Upload, JSP Filter, Client Request, Server Response, Cookies Handling, Date Handling

Output:

When we execute the action_cookie.jsp we get two fields username and email, and it takes user input and then we click on the submit button.

We get the output from action_cookie_main.jsp where variables are stored in the cookies on the client side.

 

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