Learning JSP by Example: Write a program to display a withdrawal amount screen to the user

Write a program to display a withdrawal amount screen to the user. Provide the user with three fields: Email Id, account number, and Balance amount. Display the withdraw status to the user after the user enters the email Id, account number and amount. In addition, send an e-mail to the user’s email id informing about the withdrawal status.

Solution:

Enter the following code in the notepad and save the file as withdrawlstatus_1.jsp in Session8 folder.
//withdrawlstatus_1.jsp

<html>
<head>
<title>MARKO</title>
</head>
<body>
<H1 align="center">MARKO Withdrawal status checking
Screen</H1>
<form method ='post'>
<h3>User Email ID <input type='text' name='email'></h3>
<h3>Account no <input type='text' name='accNo'></h3>
<h3>Balance Amount <input type='text' name='Bal'></h3>
<input type='submit' value="Check Status">
</form>
<%
String strAccount = request.getParameter("accNo");
String strBal = request.getParameter("Bal");
String strEmail = request.getParameter("email");
if (strAccount == null || strBal == null || strEmail ==
null)
{
%>
<h3 align="center"> Please enter email address, account No
and Balance and click the Check Status button to compute
the withrawal status</h3>
<%
}
else
{
%>
<jsp:useBean id="objBT" class="MARKO.BankTransactionMail"
scope="session" >
<jsp:setProperty name="objBT" property="accountNo"
value="<%=strAccount%>"/>
<jsp:setProperty name="objBT" property="balance"
value="<%=strBal%>"/>
</jsp:useBean>
<h3>For Account no <jsp:getProperty name="objBT"
property="accountNo"/> :
<%
String strMessage = objBT.withdrawAllowed();
out.println(strMessage);
%>
<br>
<br>
<%=objBT.sendMail(strEmail,strMessage)%>
</h3>
<%
}
%>
</body>

Enter the following code in notepad and save the file as BankTransactionMail.java in Session8 folder.
//BankTransactionMail.java

package MARKO;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
public class BankTransactionMail implements java.io.Serializable
{
int intAccountNo;
int intBalance;
public String getBalance()
{
return String.valueOf(intBalance);
}

public void setBalance(String strBal)
{
intBalance = Integer.parseInt(strBal);
}

public String getAccountNo()
{
return String.valueOf(intAccountNo);
}

public void setAccountNo(String strAccNo)
{
intAccountNo = Integer.parseInt(strAccNo);
}

public String withdrawAllowed()
{
if (intAccountNo < 5000)
{
if (intBalance > 10000)
{
return "withdrawal is allowed!!!<br>To withdraw please
<a href='withdraw.jsp?bal= " +
String.valueOf(intBalance) + "'>click here.</a>";
//The file withdraw.jsp is created in Example 1
of Do It Yourself.
}
else
{
return "withdrawal is not allowed!!!";
}
}
else
{
return "withdrawal is allowed!!!<br>To withdraw please <a
href='withdraw.jsp?bal=" + String.valueOf(intBalance) +
"'>click here.</a>";
//The file withdraw.jsp is created later in Do it
Yourself part.
}
}
public String sendMail(String strTo,String strMsg)
{
String result = "<BR><BR><BR>";
String host = "Name_of _Machine_Running_SMTP_Service";
Properties prop = System.getProperties();
prop.put("libmail.n-syst.com", host);
Session session = Session.getDefaultInstance(prop, null);
session.setDebug(true);
try
{
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("admin@MARKO.com"));
msg.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(strTo, false));
msg.setSubject("Automated Mail from MARKO JSP Page");
MimeBodyPart mbp = new MimeBodyPart();
mbp.setText(strMsg);
Multipart mp = new MimeMultipart();
mp.addBodyPart(mbp);
msg.setContent(mp);
msg.setSentDate(new Date());
Transport.send(msg);
result = result + "<H3 align='center'>Mail was
successfully sent to </B></FONT>: "+ strTo +"<BR>";
result = result+"</H3>";
}
catch (MessagingException ex)
{
result = result + "<H3 style='color:red'
align='center'>Error : </B><BR><HR> "+"<FONT SIZE=3
COLOR=\"black\">"+ex.toString()+"<BR><HR></h3>";
}
catch (Exception e)
{
result = result + "<H3 style='color:red'
align='center'>Error : </B><BR><HR> "+"<FONT SIZE=3
COLOR=\"black\">"+e.toString()+"<BR><HR></h3>";
}
finally
{
return result;
}
}
}