Hey guys in this article, you will learn everything you need to know about Sessions in JSP with full code example.
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Table of Contents
Overview
- JSP session is created once for user’s browser session.
- It is unique for each user
- It is commonly used when you need to keep track of user’s actions
Add data to the session object
session.setAttribute(name, value);
Example:
Set<String> todos = new HashSet<String>();
session.setAttribute("todos", todos);
Retrieve data from session object
Object session.getAttribute(name);
Example:
Set<String> todos = (Set<String>) session.getAttribute("todos");
Complete Example
Follow the below steps to understand the complete example
Create a Project
You can check the following post to create a new Dynamic Web Project
Create a JSP file
Create SessionDemo.jsp file under WebContent and add the following content
<%@page import="java.util.HashSet"%>
<%@page import="java.util.Set"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="SessionDemo.jsp">
Add New Todo: <input type = "text" name="todo" />
<input type = "submit" value="Submit" />
</form>
<%
Set<String> todos = (Set<String>) session.getAttribute("todos");
if(todos == null) {
todos = new HashSet<String>();
session.setAttribute("todos", todos);
}
String todo = request.getParameter("todo");
if(todo != null) {
todos.add(todo);
}
%>
<br/><br/>
<b>My upcoming todos:</b>
<ol>
<%
for(String temp : todos) {
out.println("<li>"+temp+"</li>");
}
%>
</ol>
</body>
</html>
Run the file
Right click on the File, choose Run As, choose Run on Server. It will open in a default web browser, you will see the following content
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