pom.xml
```
4.0.0
com.in28minutes
in28Minutes-first-webapp
0.0.1-SNAPSHOT
war
javax
javaee-web-api
6.0
provided
javax.servlet
jstl
1.2
org.webjars
bootstrap
3.3.6
org.webjars
jquery
1.9.1
org.apache.maven.plugins
maven-compiler-plugin
3.2
true
1.7
1.7
true
org.apache.tomcat.maven
tomcat7-maven-plugin
2.2
/
true
```
src\main\java\in28minutes\login\LoginService.java
```
package in28minutes.login;
public class LoginService {
public boolean validateUser(String user, String password) {
return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
}
}
```
src\main\java\in28minutes\login\LoginServlet.java
```
package 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;
@WebServlet(urlPatterns = "/login.do")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private LoginService service = new LoginService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
String name = request.getParameter("name");
String password = request.getParameter("password");
boolean isValidUser = service.validateUser(name, password);
if (isValidUser) {
request.getSession().setAttribute("name", name);
response.sendRedirect("/todo.do");
} else {
request.setAttribute("errorMessage", "Invalid Credentials!!");
request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
}
}
}
```
src\main\java\in28minutes\todo\DeleteTodoServlet.java
```
package 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 static final long serialVersionUID = 1L;
private TodoService todoService = new TodoService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
todoService.deleteTodo(request.getParameter("todo"));
response.sendRedirect("/todo.do");
}
}
```
src\main\java\in28minutes\todo\ListTodoServlet.java
```
package 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 = "/todo.do")
public class ListTodoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private TodoService todoService = new TodoService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
request.setAttribute("todos", todoService.retrieveTodos());
request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
String todo = request.getParameter("todo");
if ("".equals(todo)) {
request.setAttribute("errorMessage", "Enter a valid Todo");
} else {
todoService.addTodo(todo);
}
request.setAttribute("todos", todoService.retrieveTodos());
request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
}
}
```
src\main\java\in28minutes\todo\Todo.java
```
package in28minutes.todo;
public class Todo {
public Todo(String name) {
super();
this.name = name;
}
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Todo [name=" + 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\in28minutes\todo\TodoService.java
```
package in28minutes.todo;
import java.util.ArrayList;
import java.util.List;
public class TodoService {
private static List todos = new ArrayList();
static {
todos.add(new Todo("Learn Web Application"));
todos.add(new Todo("Learn Spring"));
todos.add(new Todo("Learn Spring MVC"));
}
public List retrieveTodos() {
return todos;
}
public void addTodo(String todo) {
todos.add(new Todo(todo));
}
public void deleteTodo(String todo) {
todos.remove(new Todo(todo));
}
}
```
src\main\webapp\WEB-INF\views\login.jsp
```
Yahoo!!
${errorMessage}
```
src\main\webapp\WEB-INF\views\todo.jsp
```
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
Yahoo!!
Welcome ${name}
Your Todos are
- ${todo.name} Delete
${errorMessage}