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Of course, you must substitute the real name of the servlet for MyServlet. By specifying localhost:8080, you are specifying the host computer.
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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 javax.servlet and javax.servlet.http packages. It must also extend HttpServlet, not Applet. 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:
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// A simple loan calculator servlet. import javax.servlet.*; import javax.servlet.http.*;
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import java.io.*; import java.text.*; 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 = ""; nf = NumberFormat.getInstance(); nf.setMinimumFractionDigits(2); nf.setMaximumFractionDigits(2); // Get String String String the parameters. amountStr = request.getParameter("amount"); periodStr = request.getParameter("period"); rateStr = request.getParameter("rate");
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try { if(amountStr != null && periodStr != null && rateStr != null) { principal = Double.parseDouble(amountStr); numYears = Double.parseDouble(periodStr); intRate = Double.parseDouble(rateStr) / 100; payStr = nf.format(compute()); } else { // one or more parameters missing amountStr = ""; periodStr = ""; rateStr = ""; } } catch (NumberFormatException exc) {
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9: Financial Applets and Servlets
// No action required for this exception. } // Set the content type. response.setContentType("text/html"); // Get the output stream. PrintWriter pw = response.getWriter(); // Display the necessary HTML. pw.print("<html><body> <left>" + "<form name=\"Form1\"" + " action=\"http://localhost:8080/" + "examples/servlet/RegPayS\">" + "<B>Enter amount to finance:</B>" + " <input type=textbox name=\"amount\"" + " size=12 value=\""); pw.print(amountStr + "\">"); pw.print("<BR><B>Enter term in years:</B>" + " <input type=textbox name=\"period\""+ " size=12 value=\""); pw.println(periodStr + "\">"); pw.print("<BR><B>Enter interest rate:</B>" + " <input type=textbox name=\"rate\"" + " size=12 value=\""); pw.print(rateStr + "\">"); pw.print("<BR><B>Monthly Payment:</B>" + " <input READONLY type=textbox" + " name=\"payment\" size=12 value=\""); pw.print(payStr + "\">"); pw.print("<BR><P><input type=submit value=\"Submit\">"); pw.println("</form> </body> </html>"); } // Compute the loan payment. double compute() { double numer; double denom; double b, e; numer = intRate * principal / payPerYear; e = -(payPerYear * numYears);
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b = (intRate / payPerYear) + 1.0; denom = 1.0 - Math.pow(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, then RegPayS calculates the loan payment and redisplays the form, with the payment field filled in. Figure 9-7 shows the RegPayS servlet in action. The simplest way to invoke RegPayS is to link to its URL without passing any parameters. For example, if you are using Tomcat, you can use this line:
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