Last updated on May 5th, 2016 at 01:59 am
Java Servlet create cookie example, Just a straight forward and simple example on using Servlet to create a cookie and read it..
All you have to do is copy the below script and Name it as HttpCookie.java, Modify the code according to your needs.
import javax.servlet.http.Cookie;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;
import java.io.*;
public class HttpCookie extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
InputStream input = null;
try {
String getData = request.getParameter("Username");
Cookie userCookie = new Cookie("username",getData);
//setting cookie to expiry in 30 mins
userCookie.setMaxAge(30*60);
response.addCookie(userCookie);
Date date = new Date();
out.println("<html><title>Welcome</title><body>");
out.println("User ID "+getData+" Has Logged In Now @ "+date.toString());
System.out.println("User ID "+getData+" Has Logged In Now @ "+date.toString());
String username = "novalue";
Cookie[] cookies = request.getCookies();
for (int i = 0; i < cookies.length; i++) {
if ((cookies[i].getName()).equals("username"))
{
username = cookies[i].getValue();
out.println("<div>Welcome <div id='username'>"+cookies[i].getValue()+"</div></div>");
}
}
out.println("</body></html>");
}
finally {
if (input != null) {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
Now compile the script by using
javac HttpCookie.java
Copy the class file created to the WEB-INF/classes directory.
Edit the web.xml file and add this
<servlet>
<servlet-name>HttpCookie</servlet-name>
<servlet-class>HttpCookie</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HttpCookie</servlet-name>
<url-pattern>/HttpCookie.do</url-pattern>
</servlet-mapping>
Save the file and make sure the application got reloaded by checking the server.log file if you are using Jboss.
Using the URL http://yourwebsite/HttpCookie.do?Username=admin and see the output how the servlet set the cookie and read the value of the cookie.
admin