AtmServletpublic class AtmServlet extends HttpServlet | In general, you may use the code in this book in your programs and
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"Java Enterprise in a Nutshell, Third Edition,
by Jim Farley and William Crawford
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Copyright 2006 O'Reilly Media, Inc., 0-596-10142-2."
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| Methods Summary |
|---|
| public void | destroy()
// This is where we would save the balance to a file
| | public void | doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp)
resp.setContentType("text/html");
PrintWriter out = resp.getWriter( );
out.println("<html><body>");
out.println("<h2>First Bank of Java ATM</h2>");
out.println("Current Balance: <b>" + act.balance + "</b><br>");
out.println("<form method=post>");
out.println("Amount: <input type=text name=AMOUNT size=3><br>");
out.println("<input type=submit name=DEPOSIT value=\"Deposit\">");
out.println("<input type=submit name=WITHDRAW value=\"Withdraw\">");
out.println("</form>");
out.println("</body></html>");
| | public void | doPost(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp)
int amt=0;
try {
amt = Integer.parseInt(req.getParameter("AMOUNT"));
}
catch (NullPointerException e) {
// No Amount Parameter passed
}
catch (NumberFormatException e) {
// Amount Parameter was not a number
}
synchronized(act) {
if((req.getParameter("WITHDRAW") != null) && (amt < act.balance))
act.balance = act.balance - amt;
if((req.getParameter("DEPOSIT") != null) && (amt > 0))
act.balance = act.balance + amt;
} // end synchronized block
doGet(req, resp); // Show ATM screen
| | public void | init(javax.servlet.ServletConfig conf)
super.init(conf);
act = new Account( );
act.balance = 0;
|
|
