To be able to retrieve and store details of a todo, we need a Todo bean and a service to retrieve and store the details.

Let's create a Todo Bean:

    public class Todo {
      private int id;
      private String user;

      private String desc;

      private Date targetDate;
      private boolean isDone;

      public Todo() {}
 
      public Todo(int id, String user, String desc, 
      Date targetDate, boolean isDone) { 
        super();
        this.id = id;
        this.user = user;
        this.desc = desc;
        this.targetDate = targetDate;
        this.isDone = isDone;
      }

       //ALL Getters
    }

We have a created a simple Todo bean with the ID, the name of user, the description of the todo, the todo target date, and an indicator for the completion status. We added a constructor and getters for all fields.

Let's add TodoService now:

   @Service
   public class TodoService {
     private static List<Todo> todos = new ArrayList<Todo>();
     private static int todoCount = 3;

     static {
       todos.add(new Todo(1, "Jack", "Learn Spring MVC", 
       new Date(), false));
       todos.add(new Todo(2, "Jack", "Learn Struts", new Date(), 
       false));
       todos.add(new Todo(3, "Jill", "Learn Hibernate", new Date(), 
       false));
      }

     public List<Todo> retrieveTodos(String user) {
       List<Todo> filteredTodos = new ArrayList<Todo>();
       for (Todo todo : todos) {
         if (todo.getUser().equals(user))
         filteredTodos.add(todo);
        }
      return filteredTodos;
     }

    public Todo addTodo(String name, String desc, 
    Date targetDate, boolean isDone) {
      Todo todo = new Todo(++todoCount, name, desc, targetDate, 
      isDone);
      todos.add(todo);
      return todo;
    }

    public Todo retrieveTodo(int id) {
      for (Todo todo : todos) {
      if (todo.getId() == id)
        return todo;
      }
      return null;
     }
   }

Quick things to note are as follows:

• To keep things simple, this service does not talk to the database. It maintains an in-memory array list of todos. This list is initialized using a static initializer.
• We are exposing a couple of simple retrieve methods and a method to add a to-do.

Now that we have the service and bean ready, we can create our first service to retrieve a list of to-do's for a user.