The web client is contained in the JSP page tut-install/javaeetutorial5/examples/ejb/converter/converter-war/web/index.jsp. A JSP page is a text-based document that contains JSP elements, which construct dynamic content, and static template data, which can be expressed in any text-based format such as HTML, WML, and XML.

Coding the `converter` Web Client

The statements (in bold in the following code) for locating the business interface, creating an enterprise bean instance, and invoking a business method are nearly identical to those of the application client. The parameter of the lookup method is the only difference.

The classes needed by the client are declared using a JSP page directive (enclosed within the <%@ %> characters). Because locating the business interface and creating the enterprise bean are performed only once, this code appears in a JSP declaration (enclosed within the <%! %> characters) that contains the initialization method, jspInit, of the JSP page. The declaration is followed by standard HTML markup for creating a form that contains an input field. A scriptlet (enclosed within the <% %> characters) retrieves a parameter from the request and converts it to a BigDecimal object. Finally, a JSP scriptlet invokes the enterprise bean’s business methods, and JSP expressions (enclosed within the <%= %> characters) insert the results into the stream of data returned to the client.

<%@ page import="converter.ejb.Converter,
 java.math.*, javax.naming.*"%>
 <%!
 private Converter converter = null;
 public void jspInit() {
 try {
 InitialContext ic = new InitialContext();
 converter = (Converter)
 ic.lookup(Converter.class.getName());
 } catch (Exception ex) {
 System.out.println("Couldn’t create converter bean."+
 ex.getMessage());
 }
 }
 public void jspDestroy() {
 converter = null;
 }
%>
<html>
 <head>
 <title>Converter</title>
 </head>
 <body bgcolor="white">
 <h1>Converter</h1>
 <hr>
 <p>Enter an amount to convert:</p>
 <form method="get">
 <input type="text" name="amount" size="25">
 <br>
 <p>
 <input type="submit" value="Submit">
 <input type="reset" value="Reset">
 </form>
 <%
 String amount = request.getParameter("amount");
 if ( amount != null && amount.length()> 0 ) {
 BigDecimal d = new BigDecimal(amount);
 BigDecimal yenAmount = converter.dollarToYen(d);
 %>
 <p>
 <%= amount %> dollars are <%= yenAmount %> Yen.
 <p>
 <%
 BigDecimal euroAmount =
 converter.yenToEuro(yenAmount);
 %>
 <%= amount %> Yen are <%= euroAmount %> Euro.
 <%
 }
 %>
 </body>
</html>

Compiling the `converter` Web Client

The Application Server automatically compiles web clients that are JSP pages. If the web client were a servlet, you would have to compile it.

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Scripting on this page tracks web page traffic, but does not change the content in any way.

The Java EE 5 Tutorial

Creating the converter Web Client

Coding the converter Web Client

Compiling the converter Web Client

Creating the `converter` Web Client

Coding the `converter` Web Client

Compiling the `converter` Web Client