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NOTE For information on creating, testing, and running servlets, see 31 in Java

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NOTE For information on creating, testing, and running servlets, see 31

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Applying Java

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Converting the RegPay Applet into a Servlet

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It is fairly easy to convert the RegPay loan calculating applet into a servlet First, the servlet must import the javaxservlet and javaxservlethttp packages It must also extend HttpServlet, not JApplet Next, you must remove all the GUI code Then, you must add the code that obtains the parameters passed to the servlet by the HTML that calls the servlet Finally, the servlet must send the HTML that displays the results The basic financial calculations remain the same It is only the way data is obtained and displayed that changes

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The RegPayS Servlet

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The following RegPayS class is the servlet version of the RegPay applet As the code is written, it assumes that RegPaySclass will be stored in Tomcat s example servlets directory, as described in 31 Remember to enter its name into the webxml file, also as described in 31

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// A simple loan calculator servlet import javaxservlet*; import javaxservlethttp*; import javaio*; import javatext*; public class RegPayS extends HttpServlet { double principal; // original principal double intRate; // interest rate double numYears; // length of loan in years /* Number of payments per year You could allow this value to be set by the user */ final int payPerYear = 12; NumberFormat nf; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String payStr = ""; // Create a number format nf = NumberFormatgetInstance(); nfsetMinimumFractionDigits(2); nfsetMaximumFractionDigits(2); // Get String String String the parameters amountStr = requestgetParameter("amount"); periodStr = requestgetParameter("period"); rateStr = requestgetParameter("rate");

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try { if(amountStr != null && periodStr != null && rateStr != null) { principal = DoubleparseDouble(amountStr);

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32:

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Financial Applets and Servlets

numYears = DoubleparseDouble(periodStr); intRate = DoubleparseDouble(rateStr) / 100; payStr = nfformat(compute()); } else { // one or more parameters missing amountStr = ""; periodStr = ""; rateStr = ""; } } catch (NumberFormatException exc) { // Take appropriate action here } // Set the content type responsesetContentType("text/html"); // Get the output stream PrintWriter pw = responsegetWriter(); // Display the necessary HTML pwprint("<html><body> <left>" + "<form name=\"Form1\"" + " action=\"http://localhost:8080/" + "servlets-examples/servlet/RegPayS\">" + "<B>Enter amount to finance:</B>" + " <input type=textbox name=\"amount\"" + " size=12 value=\""); pwprint(amountStr + "\">"); pwprint("<BR><B>Enter term in years:</B>" + " <input type=textbox name=\"period\""+ " size=12 value=\""); pwprintln(periodStr + "\">"); pwprint("<BR><B>Enter interest rate:</B>" + " <input type=textbox name=\"rate\"" + " size=12 value=\""); pwprint(rateStr + "\">"); pwprint("<BR><B>Monthly Payment:</B>" + " <input READONLY type=textbox" + " name=\"payment\" size=12 value=\""); pwprint(payStr + "\">"); pwprint("<BR><P><input type=submit value=\"Submit\">"); pwprintln("</form> </body> </html>"); } // Compute the loan payment double compute() { double numer; double denom; double b, e; numer = intRate * principal / payPerYear;

Part IV:

Applying Java

e = -(payPerYear * numYears); b = (intRate / payPerYear) + 10; denom = 10 - Mathpow(b, e); return numer / denom; } }

The first thing to notice about RegPayS is that it has only two methods: doGet( ) and compute( ) The compute( ) method is the same as that used by the applet The doGet( ) method is defined by the HttpServlet class, which RegPayS extends This method is called by the server when the servlet must respond to a GET request Notice that it is passed a reference to the HttpServletRequest and HttpServletResponse objects associated with the request From the request parameter, the servlet obtains the arguments associated with the request It does this by calling getParameter( ) The parameter is returned in its string form Thus, a numeric value must be manually converted into its binary format If no parameter is available, a null is returned From the response object, the servlet obtains a stream to which response information can be written The response is then returned to the browser by outputting to that stream Prior to obtaining a PrintWriter to the response stream, the output type should be set to text/html by calling setContentType( ) RegPayS can be called with or without parameters If called without parameters, the servlet responds with the necessary HTML to display an empty loan calculator form Otherwise, if called with all needed parameters, RegPayS calculates the loan payment and redisplays the form, with the payment field filled in Figure 32-7 shows the RegPayS servlet in action

FIGURE 32-7

NOTE For information on creating, testing, and running servlets, see 31 in Java Printer QR Code in Java NOTE For information on creating, testing, and running servlets, see 31

NOTE For information on creating, testing, and running servlets, see 31 in Java

Printer QR Code in Java NOTE For information on creating, testing, and running servlets, see 31