This document demonstrates how to create a complete (and very simple) J2EE project
in WebSphere Studio.
This sample project is in MVC (Model-View-Control) Model 2 architecture. It has all the elements except linking to database. The original code is from web site http://www.javaworld.com/javaworld/jw-12-1999/jw-12-ssj-jspmvc_p.html. I reconstructed it to work in WebSphere Studio.
Files:
View: Three JSP pages are used as view. They are Eshop.jsp, Checkout.jsp, and
Cart.jsp
Controller: Servlet program, which is ShoppingServlet.java
Model: JavaBean, which is CD.java
How to create the files:
How the files are related (Modification to the original code):
The file structure at WebSphere look as following
Build the project. Highlight file Eship.jsp, click right mouse, select Run on Server to start the server and run the web pages. If you make any change in the xml file, you have to stop and then restart the server.
Source Code:
EShop.jsp <%@ page session="true" %> <html> |
Cart.jsp <%@ page session="true" %>
|
Checkout.jsp <%@ page session="true" import="java.util.*, shopping.CD" %> <html><head><title>Music Without Borders Checkout</title></head> |
ShoppingServlet.java
---------------------------------
/*
* Created on Nov 13, 2003
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
/**
* @author lzhang
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import shopping.CD;
public class ShoppingServlet extends HttpServlet {
public void init(ServletConfig conf) throws ServletException {
super.init(conf);
}
public void doPost (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
HttpSession session = req.getSession(false);
if (session == null) {
res.sendRedirect("http://localhost:8080/error.html");
}
Vector buylist=
// (Vector)session.getValue("shopping.shoppingcart");
(Vector)session.getAttribute("shopping.shoppingcart");
String action = req.getParameter("action");
if (!action.equals("CHECKOUT")) {
if (action.equals("DELETE")) {
String del = req.getParameter("delindex");
int d = (new Integer(del)).intValue();
buylist.removeElementAt(d);
} else if (action.equals("ADD")) {
//any previous buys of same cd?
boolean match=false;
CD aCD = getCD(req);
if (buylist==null) {
//add first cd to the cart
buylist = new Vector(); //first order
buylist.addElement(aCD);
} else { // not first buy
for (int i=0; i< buylist.size(); i++) {
CD cd = (CD) buylist.elementAt(i);
if (cd.getAlbum().equals(aCD.getAlbum())) {
cd.setQuantity(cd.getQuantity()+aCD.getQuantity());
buylist.setElementAt(cd,i);
match = true;
} //end of if name matches
} // end of for
if (!match)
buylist.addElement(aCD);
}
}
session.setAttribute("shopping.shoppingcart", buylist);
String url="/EShop.jsp";
ServletContext sc = getServletContext();
RequestDispatcher rd = sc.getRequestDispatcher(url);
rd.forward(req, res);
} else if (action.equals("CHECKOUT")) {
float total =0;
for (int i=0; i< buylist.size();i++) {
CD anOrder = (CD) buylist.elementAt(i);
float price= anOrder.getPrice();
int qty = anOrder.getQuantity();
total += (price * qty);
}
total += 0.005;
String amount = new Float(total).toString();
int n = amount.indexOf('.');
amount = amount.substring(0,n+3);
req.setAttribute("amount",amount);
String url="/Checkout.jsp";
ServletContext sc = getServletContext();
RequestDispatcher rd = sc.getRequestDispatcher(url);
rd.forward(req,res);
}
}
private CD getCD(HttpServletRequest req) {
//imagine if all this was in a scriptlet...ugly, eh?
String myCd = req.getParameter("CD");
String qty = req.getParameter("qty");
StringTokenizer t = new StringTokenizer(myCd,"|");
String album= t.nextToken();
String artist = t.nextToken();
String country = t.nextToken();
String price = t.nextToken();
price = price.replace('$',' ').trim();
CD cd = new CD();
cd.setAlbum(album);
cd.setArtist(artist);
cd.setCountry(country);
cd.setPrice((new Float(price)).floatValue());
cd.setQuantity((new Integer(qty)).intValue());
return cd;
}
}
--------------------------------
|
CD.java ----------------------------------- /*
* Created on Nov 13, 2003
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
/**
* @author lzhang
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
package shopping;
public class CD {
String album;
String artist;
String country;
float price;
int quantity;
public CD() {
album="";
artist="";
country="";
price=0;
quantity=0;
}
public void setAlbum(String title) {
album=title;
}
public String getAlbum() {
return album;
}
public void setArtist(String group) {
artist=group;
}
public String getArtist() {
return artist;
}
public void setCountry(String cty) {
country=cty;
}
public String getCountry() {
return country;
}
public void setPrice(float p) {
price=p;
}
public float getPrice() {
return price;
}
public void setQuantity(int q) {
quantity=q;
}
public int getQuantity() {
return quantity;
}
}
---------------------------------
|
