Java Server Pages API is a set of classes and interfaces that allow developers to create and manage dynamic web pages in Java Server Pages (JSP) technology. It provides a way for JSP pages to interact with servlets and other server-side components.
Table of Contents
Using JSP API to create a login page
It can be used to create a login page that verifies user credentials and manages user sessions on the server-side.
<%@page import="javax.servlet.http.HttpSession"%>
<%
String username = request.getParameter("username");
String password = request.getParameter("password");
if (username != null && password != null) {
if (username.equals("admin") && password.equals("password")) {
HttpSession session = request.getSession();
session.setAttribute("username", username);
response.sendRedirect("dashboard.jsp");
} else {
out.println("Invalid username or password. Please try again.");
}
}
%>
<html>
<head>
<title>Login</title>
</head>
<body>
<form method="post" action="">
<label for="username">Username:</label>
<input type="text" name="username" id="username" required><br>
<label for="password">Password:</label>
<input type="password" name="password" id="password" required><br>
<button type="submit">Login</button>
</form>
</body>
</html>
JSP API Features
JSP API Tags
It includes a set of custom tags that can be used to perform actions such as forwarding requests and including other pages.
JSP API Session Management
It provides a way to manage user sessions on the server-side, which allows developers to store and retrieve user-specific data.
JSP API Error Handling
It provides a way to handle errors and exceptions that occur during the execution of a JSP page.
Conclusion
Java Server Pages (JSP) API simplifies the development process for building dynamic and interactive web applications using Java. Its continued relevance is assured as web technologies continue to evolve.
