/*
* Cart1.java
*
* Simple session tracking using hidden form field.
*/
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Cart1 extends HttpServlet {
Map carts;
int sessSeed;
public void init() throws ServletException
{
carts = new HashMap();
sessSeed = 0;
}
public void doPost( HttpServletRequest request, HttpServletResponse response )
throws ServletException, IOException
{
doGet( request, response );
}
public void doGet( HttpServletRequest request, HttpServletResponse response )
throws ServletException, IOException
{
// get session id. if there is none, create one with
// a shop cart associated with it
String sid;
if( request.getParameter("sid") == null )
{
sid = "" + sessSeed++;
carts.put( sid, new ArrayList() );
}
else
sid = request.getParameter("sid");
response.setContentType( "text/html" );
PrintWriter out = response.getWriter();
out.print( "" );
out.println( "Shopping Cart" );
out.println( "" );
// add new item
ArrayList cart = (ArrayList) carts.get( sid );
String item = request.getParameter("item");
if( item != null && request.getParameter("add") != null )
cart.add( item );
// show items
for( int i=0 ; i < cart.size() ; ++i )
out.println( cart.get(i) + "
" );
// a form to add more
out.println( "");
out.println( "" );
out.println( "" );
}
} // end of class Cart1