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Login and Registration Example in JSP with Session

Those who want to start with jsp and MySQL, this is an excellent example for themselves. Here you can learn how to insert data to MySQL using JSP.

Also you can learn about session handling in jsp.
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CREATE TABLE `members` (
  `id` int(10) unsigned NOT NULL auto_increment,
  `first_name` varchar(45) NOT NULL,
  `last_name` varchar(45) NOT NULL,
  `email` varchar(45) NOT NULL,
  `uname` varchar(45) NOT NULL,
  `pass` varchar(45) NOT NULL,
  `regdate` date NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
index.jsp
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<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Example</title>
    </head>
    <body>
        <form method="post" action="login.jsp">
            <center>
            <table border="1" width="30%" cellpadding="3">
                <thead>
                    <tr>
                        <th colspan="2">Login Here</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>User Name</td>
                        <td><input type="text" name="uname" value="" /></td>
                    </tr>
                    <tr>
                        <td>Password</td>
                        <td><input type="password" name="pass" value="" /></td>
                    </tr>
                    <tr>
                        <td><input type="submit" value="Login" /></td>
                        <td><input type="reset" value="Reset" /></td>
                    </tr>
                    <tr>
                        <td colspan="2">Yet Not Registered!! <a href="reg.jsp">Register Here</a></td>
                    </tr>
                </tbody>
            </table>
            </center>
        </form>
    </body>
</html>
reg.jsp
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<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Registration</title>
    </head>
    <body>
        <form method="post" action="registration.jsp">
            <center>
            <table border="1" width="30%" cellpadding="5">
                <thead>
                    <tr>
                        <th colspan="2">Enter Information Here</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>First Name</td>
                        <td><input type="text" name="fname" value="" /></td>
                    </tr>
                    <tr>
                        <td>Last Name</td>
                        <td><input type="text" name="lname" value="" /></td>
                    </tr>
                    <tr>
                        <td>Email</td>
                        <td><input type="text" name="email" value="" /></td>
                    </tr>
                    <tr>
                        <td>User Name</td>
                        <td><input type="text" name="uname" value="" /></td>
                    </tr>
                    <tr>
                        <td>Password</td>
                        <td><input type="password" name="pass" value="" /></td>
                    </tr>
                    <tr>
                        <td><input type="submit" value="Submit" /></td>
                        <td><input type="reset" value="Reset" /></td>
                    </tr>
                    <tr>
                        <td colspan="2">Already registered!! <a href="index.jsp">Login Here</a></td>
                    </tr>
                </tbody>
            </table>
            </center>
        </form>
    </body>
</html>
registration.jsp
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<%@ page import ="java.sql.*" %>
<%
    String user = request.getParameter("uname");   
    String pwd = request.getParameter("pass");
    String fname = request.getParameter("fname");
    String lname = request.getParameter("lname");
    String email = request.getParameter("email");
    Class.forName("com.mysql.jdbc.Driver");
    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/dbname",
            "root", "dbpass");
    Statement st = con.createStatement();
    //ResultSet rs;
    int i = st.executeUpdate("insert into members(first_name, last_name, email, uname, pass, regdate) values ('" + fname + "','" + lname + "','" + email + "','" + user + "','" + pwd + "', CURDATE())");
    if (i > 0) {
        //session.setAttribute("userid", user);
        response.sendRedirect("welcome.jsp");
       // out.print("Registration Successfull!"+"<a href='index.jsp'>Go to Login</a>");
    } else {
        response.sendRedirect("index.jsp");
    }
%>
welcome.jsp
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Registration is Successful.
Please Login Here <a href='index.jsp'>Go to Login</a>
login.jsp
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<%@ page import ="java.sql.*" %>
<%
    String userid = request.getParameter("uname");   
    String pwd = request.getParameter("pass");
    Class.forName("com.mysql.jdbc.Driver");
    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/dbname",
            "root", "dbpass");
    Statement st = con.createStatement();
    ResultSet rs;
    rs = st.executeQuery("select * from members where uname='" + userid + "' and pass='" + pwd + "'");
    if (rs.next()) {
        session.setAttribute("userid", userid);
        //out.println("welcome " + userid);
        //out.println("<a href='logout.jsp'>Log out</a>");
        response.sendRedirect("success.jsp");
    } else {
        out.println("Invalid password <a href='index.jsp'>try again</a>");
    }
%>
success.jsp
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<%
    if ((session.getAttribute("userid") == null) || (session.getAttribute("userid") == "")) {
%>
You are not logged in<br/>
<a href="index.jsp">Please Login</a>
<%} else {
%>
Welcome <%=session.getAttribute("userid")%>
<a href='logout.jsp'>Log out</a>
<%
    }
%>
logout.jsp
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<%
session.setAttribute("userid", null);
session.invalidate();
response.sendRedirect("index.jsp");

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