Solution:
//withdraw.jsp
<html>1. Save the file as withdraw.jsp in basic directory.
<head>
<title>MARKO</title>
</head>
<body>
<H1 align="center">MARKO Amount Withdrawal Screen</H1>
<%
String amt = request.getParameter("amt") ;
String balance = request.getParameter("bal");
if (amt == null)
{
%>
<form method="post">
<h3>
Your balance is <input type='text' readonly name='bal'
value='<%=balance%>'><br>
Please enter the amount to be withdrawn <input
type="text"
name="amt">
<input type="submit" value="Withdraw">
</form>
<%
}
else
{
%>
<jsp:useBean id="objW" class="MARKO.AccountBean"
scope="page" />
<jsp:setProperty name="objW" property="balance"
value="<%=balance%>"/>
<jsp:setProperty name="objW" property="amount"
value="<%=amt%>"/>
<H3 align="center">Rs. <%=amt%> withdrawn from your
account
the new balance is <jsp:getProperty name="objW"
property="balance"/>
</h3>
<%
}
%>
</body>
</html>
2. Open Notepad and enter the following code.
//AccountBean.java
package MARKO;3. Save the file as AccountBean.java in Session8 directory.
public class AccountBean implements java.io.Serializable
{
private int amount = 0;
private int balance = 0 ;
public String getAmount()// throws Exception
{
return String.valueOf(amount);
}
public void setAmount(String strAmt)// throws Exception
{
this.amount=Integer.parseInt(strAmt);
}
public String getBalance()
{
if (balance < amount)
{
return "Balance is not sufficient to withdraw money.";
}
else
{
balance = balance - amount;
}
return ("Rs."+String.valueOf(amount)+" withdrawn from your
account. The new balance is Rs"+String.valueOf(balance));
}
public void setBalance(String strBal)
{
balance = Integer.parseInt(strBal);
}
}
4. Stop and restart Tomcat server.
5. Open Internet Explorer and enter http://localhost:8080/Session8/withdraw.jsp in the browser.
The output appears as shown in Figure 8.6.
Figure 8.6: Withdraw Amount ScreenEnter an amount greater than the balance amount. A message will be displayed to the user informing that balance amount is insufficient.
Figure 8.7: Output with invalid amountEnter the amount to be withdrawn and click the Withdraw button. The output appears as shown in Figure 8.7 when you click on Withdraw button.
Figure 8.8: Output with valid amount
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