Use hidden fields to save session data
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ShoppingCartViewerHidden extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("<HEAD><TITLE>Current Shopping Cart Items</TITLE></HEAD>");
out.println("<BODY>");
// Cart items are passed in as the item parameter.
String[] items = req.getParameterValues("item");
// Print the current cart items.
out.println("You currently have the following items in your cart:<BR>");
if (items == null) {
out.println("<B>None</B>");
}
else {
out.println("<UL>");
for (int i = 0; i < items.length; i++) {
out.println("<LI>" + items[i]);
}
out.println("</UL>");
}
// Ask if the user wants to add more items or check out.
// Include the current items as hidden fields so they'll be passed on.
out.println("<FORM ACTION=\"/servlet/ShoppingCart\" METHOD=POST>");
if (items != null) {
for (int i = 0; i < items.length; i++) {
out.println("<INPUT TYPE=HIDDEN NAME=\"item\" VALUE=\"" +
items[i] + "\">");
}
}
out.println("Would you like to<BR>");
out.println("<INPUT TYPE=SUBMIT VALUE=\" Add More Items \">");
out.println("<INPUT TYPE=SUBMIT VALUE=\" Check Out \">");
out.println("</FORM>");
out.println("</BODY></HTML>");
}
}
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