📄 fourthservlet.java
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import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.io.*;
public class fourthservlet extends HttpServlet
{
String accountnumber;
Connection con;
public void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
{
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc:odbc:MyDataSource","sa","");
}
catch(Exception e)
{
System.out.println(e);
}
ServletContext context = getServletContext();
Object obj = context.getAttribute("accountnumber");
String accnum=obj.toString();
double amount=0.0;
PrintWriter out=res.getWriter();
res.setContentType("text/html");
try
{
PreparedStatement s=con.prepareStatement("select mBalance from Account_Holder where cAccount_id=?");
s.setString(1,accnum);
ResultSet result=s.executeQuery();
result.next();
if (result==null)
{
System.out.println("Error executing the query");
}
else
{
amount=result.getDouble(1);
}
}catch(SQLException e)
{
System.out.println(e.toString());
} //end catch
out.println("<HTML>");
out.println("<BODY bgcolor=pink>");
out.println("<head>");
out.println("<title>");
out.println("Balance");
out.println("</title>");
out.println("</head>");
out.println("<b><u>Your balance details</u></b>");
out.println("<br>");
out.println("Account number: "+accnum);
out.println("<br>");
out.println("Balance after the previous transaction: "+amount);
out.println("<br>");
out.println("<b><font size=5 color=green> Balance statement </font> </b>");
// printing the last 20 transactions made by the user
//---------------------------------------------------
boolean rowfound=true;
out.println("<hr>");
out.println("<table cellpadding =20>");
out.println("<tr>");
out.println("<td>");
out.println("Account Number ");
out.println("</td>");
out.println("<td>");
out.println("Date ");
out.println("</td>");
out.println("<td>");
out.println("Amount Deposited (Rs) ");
out.println("</td>");
out.println("</tr>");
out.println("</table>");
out.println("<hr>");
// Fetching the details from the account_holder_transaction table and displaying them
//-----------------------------------------------------------------------------------
int totalrows=0;
try
{
PreparedStatement s1=con.prepareStatement("select count(*) from account_holder_transaction where cAccount_id=?");
s1.setString(1,accnum);
ResultSet r=s1.executeQuery();
r.next();
totalrows=r.getInt(1);
totalrows-=20;
}
catch (Exception e)
{
}
try
{
PreparedStatement s2=con.prepareStatement("Select cAccount_id,datepart(d,dDate_of_transaction),datepart(m,dDate_of_transaction),datepart(yy,dDate_of_transaction),mAmount from account_holder_transaction where cAccount_id=?");
s2.setString(1,accnum);
ResultSet result=s2.executeQuery();
rowfound=result.next();
int numrows=0;
int dd,mm,yy;
dd=mm=yy=0;
if (rowfound)
numrows=1;
String d=new String(" ");
while (rowfound)
{
if (numrows> totalrows)
{
dd=result.getInt(2);
mm=result.getInt(3);
yy=result.getInt(4);
double mdeposit=result.getDouble(5);
d=dd+"/"+mm+"/"+yy;
out.println("           ");
out.println(accnum);
out.println("             ");
out.println(d);
out.println("               ");
out.println(mdeposit);
out.println("<br>");
}
rowfound=result.next();
numrows++;
}// end while
}
catch (Exception e)
{
System.out.println(e.toString());
}
out.println("</BODY>");
out.println("</HTML>");
out.close();
}
}
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