Overview: The program will create a Servlet that will respond to HTML requests with text streams. The servlet will have locally instantiated Expert System object. The website will allow a user to see results from the Expert System or add new data to the Expert System. Specifics: index.html Webpage that allows the user to select a link to go to the using page or a link to go to the training page. These buttons / links will call the servlet. The servlet will serve up either using.jsp (with appropriate data) or training.jsp. using.jsp Webpage that allows the user to query the Expert System using a drop down list of key words. Initially this page has no results, only the drop down list and a button. The button click will call the servlet. The servlet will serve up using.jsp with appropriate data. This page will also a button to go to the training page. training.jsp Webpage that allows the user to update the Expert System using two text fields. One is a key that may or may not already be in the Expert System. The other is a new value. The button click will call the servlet. The servlet will either add to an existing keys values (if the key already exists) or will add a new key / value pair. The servlet will serve up the training.jsp page. This page will also a button to go to the using page. DataServlet.java The servlet class that manages all of the requests and responses.

here is the code:

songdatabase:

package project2;

import java.io.IOException;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* Servlet implementation class SongDatabase

*/

@WebServlet("/SongDatabase")

public class SongDatabase extends HttpServlet {

private static final long serialVersionUID = 1L;

/**

* @see HttpServlet#HttpServlet()

*/

public SongDatabase() {

super();

// TODO Auto-generated constructor stub

}

/**

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

//response.getWriter().append("Served at: ").append(request.getContextPath());

String name = request.getParameter("name");

if(request.getParameter("indexButton")!=null)

{

String song = request.getParameter("textbox1");

response.getWriter().append("Your name is: "+name);

response.getWriter().append(" ");

String car = request.getParameter("cars");

response.getWriter().append("You would like a: "+car);

}

else if(request.getParameter("startUsing")!=null)

{

String label1="selectionList";

String label1Value = "";

label1Value += "

Volvo";

label1Value += "

Saab";

label1Value += "

Mercedes";

label1Value += "

Audi";

label1Value += "

";

request.setAttribute(label1,label1Value);

RequestDispatcher rd=request.getRequestDispatcher("/using.jsp");

rd.forward(request,response);

}

// did this response.getWriter().append("Served at: ").append(request.getContextPath());

}

/**

* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

*/

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

doGet(request, response);

}

}

index.html:

Enter your name: Select an artist: Volvo Saab Mercedes Audi

Produces: Partial Code

using.jsp:

<% String selectionText=(String)request.getAttribute("selectionList"); %> Please select a car: <%=selectionText%>

training.jsp: