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pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.in28minutes</groupId>
    <artifactId>in28Minutes-first-webapp</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
 		
 		<dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
            <version>3.3.6</version>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>1.9.1</version>
        </dependency>
    </dependencies>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.2</version>
                    <configuration>
                        <verbose>true</verbose>
                        <source>1.7</source>
                        <target>1.7</target>
                        <showWarnings>true</showWarnings>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.tomcat.maven</groupId>
                    <artifactId>tomcat7-maven-plugin</artifactId>
                    <version>2.2</version>
                    <configuration>
                        <path>/</path>
                        <contextReloadable>true</contextReloadable>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

src/main/java/com/in28minutes/filter/LoginRequiredFilter.java

package com.in28minutes.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;

@WebFilter(urlPatterns = "*.do")
public class LoginRequiredFilter implements Filter {

	@Override
	public void destroy() {

	}

	@Override
	public void doFilter(ServletRequest servletRequest,
			ServletResponse servletResponse, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) servletRequest;

		if (request.getSession().getAttribute("name") != null) {
			chain.doFilter(servletRequest, servletResponse);
		} else {
			request.getRequestDispatcher("/login.do").forward(servletRequest,
					servletResponse);
		}
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
	}

}

src/main/java/com/in28minutes/login/LoginService.java

package com.in28minutes.login;

public class LoginService {

	public boolean isUserValid(String user, String password) {
		if (user.equals("in28Minutes") && password.equals("dummy"))
			return true;

		return false;
	}

}

src/main/java/com/in28minutes/login/LoginServlet.java

package com.in28minutes.login;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.in28minutes.todo.TodoService;

@WebServlet(urlPatterns = "/login.do")
public class LoginServlet extends HttpServlet {

	private LoginService userValidationService = new LoginService();
	private TodoService todoService = new TodoService();

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
				request, response);
	}

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		String name = request.getParameter("name");
		String password = request.getParameter("password");

		boolean isUserValid = userValidationService.isUserValid(name, password);

		if (isUserValid) {
			request.getSession().setAttribute("name", name);
			response.sendRedirect("/list-todos.do");
		} else {
			request.setAttribute("errorMessage", "Invalid Credentials!");
			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
					request, response);
		}
	}

}

src/main/java/com/in28minutes/logout/LogoutServlet.java

package com.in28minutes.logout;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns = "/logout.do")
public class LogoutServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		request.getSession().invalidate();
		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
				request, response);
	}
}

src/main/java/com/in28minutes/todo/AddTodoServlet.java

package com.in28minutes.todo;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns = "/add-todo.do")
public class AddTodoServlet extends HttpServlet {

	private TodoService todoService = new TodoService();

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		request.getRequestDispatcher("/WEB-INF/views/add-todo.jsp").forward(
				request, response);
	}

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		String newTodo = request.getParameter("todo");
		todoService.addTodo(new Todo(newTodo));
		response.sendRedirect("/list-todos.do");
	}
}

src/main/java/com/in28minutes/todo/DeleteTodoServlet.java

package com.in28minutes.todo;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns = "/delete-todo.do")
public class DeleteTodoServlet extends HttpServlet {

	private TodoService todoService = new TodoService();

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		todoService.deleteTodo(new Todo(request.getParameter("todo")));
		response.sendRedirect("/list-todos.do");
	}
}

src/main/java/com/in28minutes/todo/ListTodoServlet.java

package com.in28minutes.todo;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns = "/list-todos.do")
public class ListTodoServlet extends HttpServlet {

	private TodoService todoService = new TodoService();

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		request.setAttribute("todos", todoService.retrieveTodos());
		request.getRequestDispatcher("/WEB-INF/views/list-todos.jsp").forward(
				request, response);
	}
}

src/main/java/com/in28minutes/todo/Todo.java

package com.in28minutes.todo;

public class Todo {
	private String name;

	public Todo(String name) {
		super();
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public String toString() {
		return String.format("Todo [name=%s]", name);
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Todo other = (Todo) obj;
		if (name == null) {
			if (other.name != null)
				return false;
		} else if (!name.equals(other.name))
			return false;
		return true;
	}

}

src/main/java/com/in28minutes/todo/TodoService.java

package com.in28minutes.todo;

import java.util.ArrayList;
import java.util.List;

public class TodoService {
	private static List<Todo> todos = new ArrayList<Todo>();
	static {
		todos.add(new Todo("Learn Web Application Development"));
		todos.add(new Todo("Learn Spring MVC"));
		todos.add(new Todo("Learn Spring Rest Services"));
	}

	public List<Todo> retrieveTodos() {
		return todos;
	}

	public void addTodo(Todo todo) {
		todos.add(todo);
	}

	public void deleteTodo(Todo todo) {
		todos.remove(todo);
	}

}

src/main/webapp/WEB-INF/views/add-todo.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<title>Todos</title>
<link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
	rel="stylesheet">

<style>
.footer {
	position: absolute;
	bottom: 0;
	width: 100%;
	height: 60px;
	background-color: #f5f5f5;
}
</style>
</head>

<body>

	<nav class="navbar navbar-default">

		<a href="/" class="navbar-brand">Brand</a>

		<ul class="nav navbar-nav">
			<li class="active"><a href="#">Home</a></li>
			<li><a href="/list-todos.do">Todos</a></li>
			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
		</ul>

		<ul class="nav navbar-nav navbar-right">
			<li><a href="/logout.do">Logout</a></li>
		</ul>

	</nav>

	<div class="container">
		Your New Action Item:
		<form method="POST" action="/add-todo.do">
			New Todo : <input name="todo" type="text" /> <input name="add"
				type="submit" />
		</form>
	</div>

	<footer class="footer">
		<div>footer content</div>
	</footer>

	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>

</body>

</html>

src/main/webapp/WEB-INF/views/list-todos.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<title>Todos</title>
<link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
	rel="stylesheet">

<style>
.footer {
	position: absolute;
	bottom: 0;
	width: 100%;
	height: 60px;
	background-color: #f5f5f5;
}
</style>
</head>

<body>

	<nav class="navbar navbar-default">

		<a href="/" class="navbar-brand">Brand</a>

		<ul class="nav navbar-nav">
			<li class="active"><a href="#">Home</a></li>
			<li><a href="/list-todos.do">Todos</a></li>
			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
		</ul>

		<ul class="nav navbar-nav navbar-right">
			<li><a href="/logout.do">Logout</a></li>
		</ul>

	</nav>

	<div class="container">
		<H1>Welcome ${name}</H1>

		Your Todos are
		<ol>
			<c:forEach items="${todos}" var="todo">
				<li>${todo.name}&nbsp;<a
					href="/delete-todo.do?todo=${todo.name}">Delete</a></li>
			</c:forEach>
		</ol>

		<p>
			<font color="red">${errorMessage}</font>
		</p>
		<a
					href="/add-todo.do">Add New Todo</a>
	</div>

	<footer class="footer">
		<div>footer content</div>
	</footer>

	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>

</body>

</html>

src/main/webapp/WEB-INF/views/login.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<title>Todos</title>
<link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
	rel="stylesheet">

<style>
.footer {
	position: absolute;
	bottom: 0;
	width: 100%;
	height: 60px;
	background-color: #f5f5f5;
}
</style>
</head>

<body>

	<nav class="navbar navbar-default">

		<a href="/" class="navbar-brand">Brand</a>

		<ul class="nav navbar-nav">
			<li class="active"><a href="#">Home</a></li>
			<li><a href="/list-todos.do">Todos</a></li>
			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
		</ul>

		<ul class="nav navbar-nav navbar-right">
			<li><a href="/login.do">Login</a></li>
		</ul>

	</nav>

	<div class="container">
		<form action="/login.do" method="post">
			<p>
				<font color="red">${errorMessage}</font>
			</p>
			Name: <input type="text" name="name" /> Password:<input
				type="password" name="password" /> <input type="submit"
				value="Login" />
		</form>

	</div>

	<footer class="footer">
		<div>footer content</div>
	</footer>

	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>

</body>

</html>

src/main/webapp/WEB-INF/web.xml

<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">

    <display-name>To do List</display-name>

    <welcome-file-list>
        <welcome-file>login.do</welcome-file>
    </welcome-file-list>

</web-app>