Simple J2EE Design patterns for newbies

Question

Hey
I've managed to get a basic understanding of how J2EE web applications are put together. I've done some simple stuff like jsp's posting to servlets to do database inserts for example.
In an effort to get a more well rounded understanding of whats going on I want to write a simple phonebook web app. As my previous adventures in web development have been php pages that mixed php and html. I really want to get away from the bad habits that people say PHP can encourage and get a proper MVC setup going. I'll describe my plan and then all you guys can rip it apart and hopefully in the process I will learn something Smile
In the case of a user wishing to insert a new record. I imagine the process to be the following.
JSP/HTML form that posts to a servlet, the servlet then uses a bean to handle the database interaction and once the bean has finished the jdbc work the servlet forwards the user to another jsp that displays the current contents of the table.
So, for example I will write a bean that has 4 methods. One to read the full contents of the table, one to insert a new record, one to update and finally one to delete.
Depending on what parameters are passed to the servlet via HTTP POST it will call the corresponding javabean method.
Am I on the right track?
Thanks

Answer 1

Ok well this is what I have come up with so far
Servlet
public void doGet (HttpServletRequest req, HttpServletResponse resp)
     throws ServletException, IOException
        out = resp.getWriter();
        String action = req.getParameter("action");
            String name = req.getParameter("name");
            String phone = req.getParameter("phone");
            DbWorker db = new phonebook.DbWorker();
            if (action.equals("insert")){
            db.doInsert(name,phone);   
            } else if (action.equals("delete")){
            db.doDelete(name,phone);   
            } else {
            out.println("you didnt ask me to do anything");   
            }  And the "Bean" it uses to do the database work is below. Note: The term java bean is used all in all the books and online forums I have seen. Whats so strange about its use today (just curious). Anyway the db stuff
public void doInsert(String name, String phone){
        String query = "Insert into test(name,email) values(?,?)";
        try{   
            PreparedStatement stmt = con.prepareStatement (query);
            stmt.setString(1, name);
            stmt.setString(2, phone);
            stmt.executeUpdate();
        } catch (SQLException e){
        public void doDelete(String name, String phone){
            String query = "delete from test where name = ? and email = ?";
            try{   
            PreparedStatement stmt = con.prepareStatement (query);
            stmt.setString(1, name);
            stmt.setString(2, phone);
            stmt.executeUpdate();
        } catch (SQLException e){
        }  The code above works without any problems. However I now want to write a method to execute a select statement and I want it to be able to return the results to a jsp that can then iterate through and print out the results. My guess is that i create a method to return the resultsset array that a jsp page picks up by using the standard tag library to go through it and print out the results?