JSP – Simple MVC Application – Ameerpet Technologies

Example of MVC in JSP Application

index.jsp
ControllerServlet.java
LoginBean.java
login-success.jsp
login-error.jsp
web.xml

index.jsp:

<%@ page language=”java” contentType=”text/html; charset=ISO-8859-1″
pageEncoding=”ISO-8859-1″%>
<!DOCTYPE html>
<html>
            <head>
                        <title>Insert title here</title>
            </head>
            <body>
                        <form action=”ControllerServlet” method=”post”>
                                    Name:<input type=”text” name=”name”><br> Password:<input
                                    type=”password” name=”password”><br> <input
                                    type=”submit” value=”login”>
                        </form>
            </body>
</html>

LoginBean.java:

public class LoginBean
{
            private String name, password;
            public String getName()
            {
                        return name;
            }
            public void setName(String name)
            {
                        this.name = name;
            }
            public String getPassword()
            {
                        return password;
            }
            public void setPassword(String password)
            {
                        this.password = password;
            }
            public boolean validate()
            {
                        if (password.equals(“admin”))
                        {
                                    return true;
                        }
                        else
                        {
                                    return false;
                        }
            }
}

ControllerServlet.java:

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ControllerServlet extends HttpServlet
{
            protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
            {
                        response.setContentType(“text/html”);
                        PrintWriter out = response.getWriter();
                        String name = request.getParameter(“name”);
                        String password = request.getParameter(“password”);
                        LoginBean bean = new LoginBean();
                        bean.setName(name);
                        bean.setPassword(password);
                        request.setAttribute(“bean”, bean);
                        boolean status = bean.validate();
                        if (status)
                        {
                                    RequestDispatcher rd = request.getRequestDispatcher(“login-success.jsp”);
                                    rd.forward(request, response);
                        }
                        else
                        {
                                    RequestDispatcher rd = request.getRequestDispatcher(“login-error.jsp”);
                                    rd.forward(request, response);
                        }
            }
            @Override
            protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
            {
                        doPost(req, resp);
            }
}

login-succes.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>
                        <title></title>
            </head>
            <body>
                        <%
                                    out.print(“Welcome”);
                        %>
            </body>
</html>

login-error.jsp:

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