On Aug 13, 2008, at 1:35 PM, Tom Shi wrote:
> In the javaeetutorial5\examples\ejb\converter example from Sun J2EE
> tutorial, the ConverterBean class is in the appClient.jar. Is the
> bean class real needed in the appClient.jar?
No. The bean class plays no role in the client programming model.
> I though the interface Converter should be enough for the appclient.
>
> In the stand-alone Java client, it works fine without bean class,
> just need the interface.
>
> ConvertClient.java
>
> /*
> * Copyright 2007 Sun Microsystems, Inc.
> * All rights reserved. You may not modify, use,
> * reproduce, or distribute this software except in
> * compliance with the terms of the License at:
> * http://developer.sun.com/berkeley_license.html
> */
>
> package converter.client;
> import converter.ejb.Converter;
> import java.math.BigDecimal;
> import javax.ejb.EJB;
>
> /**
> *
> * @author ian
> */
> public class ConverterClient {
> @EJB
> private static Converter converter;
> /** Creates a new instance of Client */
> public ConverterClient(String[] args) {
> }
> /**
> * @param args the command line arguments
> */
> public static void main(String[] args) {
> ConverterClient client = new ConverterClient(args);
> client.doConversion();
> }
> public void doConversion() {
> try {
> BigDecimal param = new BigDecimal("100.00");
> BigDecimal yenAmount = converter.dollarToYen(param);
> System.out.println("$" + param + " is " + yenAmount + "
> Yen.");
> BigDecimal euroAmount = converter.yenToEuro(yenAmount);
> System.out.println(yenAmount + " Yen is " + euroAmount +
> " Euro.");
> System.exit(0);
> } catch (Exception ex) {
> System.err.println("Caught an unexpected exception!");
> ex.printStackTrace();
> }
> }
> }
> ----------------------------------------------------------
> Converter.java
> /*
> * Copyright 2007 Sun Microsystems, Inc.
> * All rights reserved. You may not modify, use,
> * reproduce, or distribute this software except in
> * compliance with the terms of the License at:
> * http://developer.sun.com/berkeley_license.html
> */
>
> package converter.ejb;
> import java.math.BigDecimal;
> import javax.ejb.Remote;
>
> @Remote
> public interface Converter {
> public BigDecimal dollarToYen(BigDecimal dollars);
> public BigDecimal yenToEuro(BigDecimal yen);
> }
>
> -----------------------------------------------
> ConverterBean.java
> /*
> * Copyright 2007 Sun Microsystems, Inc.
> * All rights reserved. You may not modify, use,
> * reproduce, or distribute this software except in
> * compliance with the terms of the License at:
> * http://developer.sun.com/berkeley_license.html
> */
>
> package converter.ejb;
> import java.math.BigDecimal;
> import javax.ejb.Stateless;
>
> /**
> * This is the bean class for the ConverterBean enterprise bean.
> * Created Jan 20, 2006 1:14:27 PM
> * @author ian
> */
> @Stateless
> public class ConverterBean implements converter.ejb.Converter {
> private BigDecimal euroRate = new BigDecimal("0.0070");
> private BigDecimal yenRate = new BigDecimal("112.58");
> public BigDecimal dollarToYen(BigDecimal dollars) {
> BigDecimal result = dollars.multiply(yenRate);
> return result.setScale(2, BigDecimal.ROUND_UP);
> }
> public BigDecimal yenToEuro(BigDecimal yen) {
> BigDecimal result = yen.multiply(euroRate);
> return result.setScale(2, BigDecimal.ROUND_UP);
> }
> }
>
>
>