Solution:
The file used in this exercise is cart.jsp
<html>
<%
java.util.Vector v = (java.util.Vector)session.getAttribute("array");
if (v == null)
{
v = new java.util.Vector();
}
String i = null;
String submit = request.getParameter("submit");
if (submit == null)
{
submit = "";
}
if (submit.equals("add") || submit.equals(""))
{
v.addElement(request.getParameter("item"));
%>
<br> Your cart Contains :
<ol>
<%
String[] items = new String[v.size()];
v.copyInto(items);
for (int ix=1; ix < items.length; ix++) {
%>
<li> <% out.print(items[ix]);
}
%>
</ol>
<%
}
if (submit.equals("remove"))
{
String removeitem=request.getParameter("item");
if(v.contains(removeitem))
{
v.removeElement(removeitem);
}
else
{
out.println("element not found in vector");
}
%>
<br> Your cart Contains :
<ol>
<%
String[] items = new String[v.size()];
v.copyInto(items);
for (int ix=1; ix<items.length; ix++) {
%>
<li> <% out.print(items[ix]);
}
%>
</ol>
<%
}
session.setAttribute("array",v);
%>
</font>
<hr>
<font size = 3>
<form type=POST>
<BR>
Please Select the item to add or remove:
<br>
Add / Remove Item:
<select name="item">
<option>Floppy
<option>CD
<option>Keyboard
</select>
<br> <br>
<input type=submit name="submit" value="add">
<input type=submit name="submit" value="remove">
</form>
</font>
</html>
Enter the code in Notepad, and save the file as Cart.jsp in %TOMCAT_HOME%/webapps/ session.
The output of the program is as shown in Figure 12.1.
Figure 12.1: Shopping cart page
Figure 12.2 Error page
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