Develop a Loan Calculator Program in Servlet
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import javax.servlet.http.*;2
import java.io.*;3
import java.text.*;4
public class RegPayS extends HttpServlet {5
double principal;6
double intRate;7
double numYears;8
final int payPerYear = 12;9
NumberFormat nf;10
public void doGet(HttpServletRequest request,11
HttpServletResponse response)12
throws ServletException, IOException {13
String payStr = "";14
nf = NumberFormat.getInstance();15
nf.setMinimumFractionDigits(2);16
nf.setMaximumFractionDigits(2);17
String amountStr = request.getParameter("amount");18
String periodStr = request.getParameter("period");19
String rateStr = request.getParameter("rate");20
try {21
if(amountStr != null && periodStr != null &&22
rateStr != null) {23
principal = Double.parseDouble(amountStr);24
numYears = Double.parseDouble(periodStr);25
intRate = Double.parseDouble(rateStr) / 100;26
payStr = nf.format(compute());27
}28
else {29
amountStr = "";30
periodStr = "";31
rateStr = "";32
}33
} catch (NumberFormatException exc) {34
// Take appropriate action here.35
}36
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response.setContentType("text/html");38
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PrintWriter pw = response.getWriter();40
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pw.print("" +42
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<form action="\"http://localhost:8080/"" name="\"Form1\""">" + "<b>Enter amount to finance:</b>" + " <input name="\"amount\""" size="12" type="textbox" value="\"");" />"); pw.print(" <b>Enter term in years:</b>" + " <input name="\"period\""+" size="12" type="textbox" value="\"");" />"); pw.print(" <b>Enter interest rate:</b>" + " <input name="\"rate\""" size="12" type="textbox" value="\"");" />"); pw.print(" <b>Monthly Payment:</b>" + " <input name="\"payment\"" readonly="readonly" size="12" type="textbox"" value="\"");" />"); pw.print(" <input type="submit" value="\"Submit\"" />"); pw.println("</form>"); } double compute() { double numer; double denom; double b, e; numer = intRate * principal / payPerYear; e = -(payPerYear * numYears); b = (intRate / payPerYear) + 1.0; denom = 1.0 - Math.pow(b, e); return numer / denom; } }