/* Java Servlet example - Netprog Pizza Server
Uses hidden fields.
*/
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Pizza extends HttpServlet {
HttpServletRequest request;
HttpServletResponse response;
PrintWriter out;
static String path="c:\\jdk1.3\\tomcat\\webapps\\Root\\Pizza\\";
// we only either GET or POST requests
public void doPost(HttpServletRequest rq,
HttpServletResponse resp)
throws IOException, ServletException {
doGet(rq,resp);
}
public void doGet(HttpServletRequest rq,
HttpServletResponse resp)
throws IOException, ServletException {
request = rq;
response = resp;
// tell the browser we are sending back HTML
response.setContentType("text/html");
// grab a writer back to the browser
out = response.getWriter();
// now go handle this request
HandleRequest();
}
// Inside HandleRequest we grab exceptions and deal with them
// If we just thow them upward - we end up sending the Java
// call stack to the browser (probably not a good idea!)
void HandleRequest() throws IOException {
try {
// send back our logo (always)
SendFile(path+"logo.html");
// First - find out what kind of a request this is.
// Each form has a hidden field named formname that
// tells us which form the request comes from.
// Possible values:
// nothing - send back login screen
// "login" - this is a login attempt
// "order" - this is a pizza order
String form = request.getParameter("formname");
// If there is no field named "formname" we should
// send back a login screen
if (form==null) {
SendFile(path+"loginform.html");
} else if (form.equals("login")) {
// this is a login attempt
Login();
} else if (form.equals("order")) {
// this is a pizza order
Order();
} else {
// who knows?
SendFile(path+"badrequest");
}
} catch (Exception e) {
// Any exception is handled by punting...
SendFile(path+"error");
}
}
// Order() handles orders for pizza.
//
void Order() throws IOException {
// Order request - we expect "name" and "password"
// Check them before worrying about the pizza and size
String name = request.getParameter("name");
String pass = request.getParameter("password");
if (ValidateUser(name,pass)) {
// Valid name and password - look at the order
// we expect to get "pizza" and "size" fields
String pizza = request.getParameter("pizza");
String size = request.getParameter("size");
// First make sure we got a complete order
if (ValidateOrder(pizza,size)) {
// Everything looks good - print a receipt
Receipt(name,pizza,size);
} else {
// Bad order
SendFile(path+"nicetry.html");
}
} else {
// Invalid login - flame the loser
SendFile(path+"baduser.html");
SendFile(path+"loginform.html");
}
}
// Login() takes care of login requests. If everything is OK
// (valid name and password) we send back an order form with
// hidden fields in it.
void Login() throws IOException {
// Login request - we expect "name" and "password"
String name = request.getParameter("name");
String pass = request.getParameter("password");
if (ValidateUser(name,pass)) {
// Valid login - send back order form with hidden
// fields
out.println("Hello ");
out.println(""+name+", place your order
");
out.println("