contexto.log(String memnsagem);
// num Servlet qualquer contexto = getServletContext(); // num ContextListener que recebeu um evento contexto = event.getServletContext(); // num filtro (ver adiante) contexto = filterConfig.getServletContext();
// Obtém o dispatcher; ele vai mandar o banner para o usuário
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher("/banner");
if (dispatcher != null) {
dispatcher.include(request, response);
}
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import database.*;
import cart.*;
public class BannerServlet extends HttpServlet {
public void service (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("<body bgcolor=\"#ffffff\">" +
"<center>" +
"<hr> <br> " +
"<h1>" +
"<font size=\"+3\" color=\"#CC0066\">Duke's </font> <img src=\"" + request.getContextPath() + "/duke.books.gif\">" +
"<font size=\"+3\" color=\"black\">Bookstore</font>" +
"</h1>" +
"</center>" +
"<br> <hr> <br> ");
}
}
request.getContextPath() + "/duke.books.gif"
package messages;
import java.util.*;
public class BookstoreMessages extends ListResourceBundle {
public Object[][] getContents() {
return contents;
}
static final Object[][] contents = {
{"ServerError", "Your request cannot be completed. The server got the following error: "},
{"TitleServerError", "Server Error"},
{"TitleShoppingCart", "Shopping Cart"},
{"What", "What We\'re Reading"},
// ...
{"Submit", "Submit Information"},
{"Catalog", "Back to the Catalog"},
{"ThankYou", "Thank you for purchasing your books from us "},
};
}
package messages;
import java.util.*;
public class BookstoreMessages_pt extends ListResourceBundle {
public Object[][] getContents() {
return contents;
}
static final Object[][] contents = {
{"ServerError", "Seu pedido não pode ser completado. O servidor recebeu o seguinte erro: "},
{"TitleServerError", "Erro de Servidor"},
{"TitleShoppingCart", "Cesta de Compras"},
{"What", "O que Estamos Lendo"},
// ...
{"Submit", "Submeter Informação"},
{"Catalog", "Voltar ao Catálogo"},
{"ThankYou", "Obrigado por comprar seus livros conosco "},
};
}
public class BookStoreServlet extends HttpServlet {
// ...
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// ...
HttpSession session = request.getSession();
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
if (messages == null) {
Locale locale=request.getLocale();
messages = ResourceBundle.getBundle("messages.BookstoreMessages", locale);
session.setAttribute("messages", messages);
}
// ...
out.println("<b>" + messages.getString("What") + "</b>");
package util;
import java.text.NumberFormat;
import java.util.*;
public class Currency {
private Locale locale;
private double amount;
public Currency() {
locale = null;
amount = 0.0;
}
public synchronized void setLocale(Locale l) {
locale = l;
}
public synchronized void setAmount(double a) {
amount = a;
}
public synchronized String getFormat() {
NumberFormat nf = NumberFormat.getCurrencyInstance(locale);
return nf.format(amount);
}
}
public class BookDetailsServlet extends HttpServlet {
// ...
// na inicialização
Currency c = (Currency)session.getAttribute("currency");
if (c == null) {
c = new Currency();
c.setLocale(request.getLocale());
session.setAttribute("currency", c);
}
// ...
// quando se deseja imprimir o valor de um livro a partir do banco de dados
c.setAmount(bd.getPrice());
out.println(... + c.getFormat() + ...);
package filters;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class CharResponseWrapper extends HttpServletResponseWrapper {
private CharArrayWriter output;
public String toString() {
return output.toString();
}
public CharResponseWrapper(HttpServletResponse response) {
super(response);
output = new CharArrayWriter();
}
public PrintWriter getWriter() {
return new PrintWriter(output);
}
}
package filters;
import java.io.*;
import java.sql.Timestamp;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import util.Counter;
public final class HitCounterFilter implements Filter {
private FilterConfig filterConfig = null;
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public void destroy() {
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
if (filterConfig == null)
return;
HttpServletRequest hr = (HttpServletRequest)request;
HttpSession session = hr.getSession();
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
if (messages == null) {
Locale locale=request.getLocale();
messages = ResourceBundle.getBundle("messages.BookstoreMessages", locale);
session.setAttribute("messages", messages);
}
StringWriter sw = new StringWriter();
PrintWriter writer = new PrintWriter(sw);
Counter counter = (Counter)filterConfig.getServletContext().getAttribute("hitCounter");
writer.println();
writer.println("=======================================================");
writer.println("The number of hits is: " + counter.incCounter());
writer.println("=======================================================");
// Log the resulting string
writer.flush();
filterConfig.getServletContext().log(sw.getBuffer().toString());
PrintWriter out = response.getWriter();
CharResponseWrapper wrapper = new CharResponseWrapper((HttpServletResponse)response);
chain.doFilter(request, wrapper);
CharArrayWriter caw = new CharArrayWriter();
caw.write(wrapper.toString().substring(0, wrapper.toString().indexOf("</body>")-1));
caw.write("<p>\n<center><center>" + messages.getString("Visitor") + "<font color='red'>" + counter.getCounter() + "</font><center>");
caw.write("\n</body></html>");
response.setContentLength(caw.toString().length());
out.write(caw.toString());
out.close();
}
public String toString() {
if (filterConfig == null)
return ("HitCounterFilter()");
StringBuffer sb = new StringBuffer("HitCounterFilter(");
sb.append(filterConfig);
sb.append(")");
return (sb.toString());
}
}
public class CashierServlet extends HttpServlet {
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get the user's session and shopping cart
HttpSession session = request.getSession();
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
if (cart == null) {
cart = new ShoppingCart();
session.setAttribute("cart", cart);
}
// ...
double total = cart.getTotal();
// ...
public class ReceiptServlet extends HttpServlet {
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get the user's session and shopping cart
HttpSession session = request.getSession(true);
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
// Payment received -- invalidate the session
session.invalidate();
// ...
// Where to go and what to do next
out.println("<p> <p><strong><a href=\"" +
response.encodeURL(request.getContextPath() + "/catalog") +
"\">" + messages.getString("ContinueShopping") + "</a> " +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/cashier") +
"\">" + messages.getString("Checkout") + "</a> " +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/showcart?Clear=clear") +
"\">" + messages.getString("ClearCart") + "</a></strong>");
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import java.text.NumberFormat;
import java.util.*;
public class Currency {
private Locale locale;
private double amount;
public Currency() {
locale = null;
amount = 0.0;
}
public synchronized void setLocale(Locale l) {
locale = l;
}
public synchronized void setAmount(double a) {
amount = a;
}
public synchronized String getFormat() {
NumberFormat nf = NumberFormat.getCurrencyInstance(locale);
return nf.format(amount);
}
}
package util;
public class Counter {
private int counter;
public Counter() {
counter = 0;
}
public synchronized int getCounter() {
return counter;
}
public synchronized int setCounter(int c) {
counter = c;
return counter;
}
public synchronized int incCounter() {
return(++counter);
}
}
package listeners;
import database.BookDB;
import javax.servlet.*;
import util.Counter;
public final class ContextListener
implements ServletContextListener {
private ServletContext context = null;
public void contextInitialized(ServletContextEvent event) {
context = event.getServletContext();
try {
BookDB bookDB = new BookDB();
context.setAttribute("bookDB", bookDB);
} catch (Exception ex) {
context.log("Couldn't create bookstore database bean: " + ex.getMessage());
}
context.setAttribute("hitCounter", new Counter());
context.setAttribute("orderCounter", new Counter());
}
public void contextDestroyed(ServletContextEvent event) {
context = event.getServletContext();
BookDB bookDB = (BookDB)context.getAttribute("bookDB");
bookDB.remove();
context.removeAttribute("bookDB");
context.removeAttribute("hitCounter");
context.removeAttribute("orderCounter");
}
}
package database;
import java.sql.*;
import javax.sql.*;
import javax.naming.*;
import java.util.*;
import exception.*;
public class BookDB {
private ArrayList books;
Connection con;
private String dbName = "java:comp/env/jdbc/BookDB";
public BookDB () throws Exception {
try {
InitialContext ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup(dbName);
con = ds.getConnection();
} catch (Exception ex) {
throw new Exception("Couldn't open connection to database: " + ex.getMessage());
}
}
public void remove () {
try {
con.close();
} catch (SQLException ex) {
System.out.println(ex.getMessage());
}
}
public int getNumberOfBooks() throws BooksNotFoundException {
return getBooks().size();
}
public Collection getBooks() throws BooksNotFoundException {
books = new ArrayList();
try {
String selectStatement = "select * from books";
PreparedStatement prepStmt = con.prepareStatement(selectStatement);
ResultSet rs = prepStmt.executeQuery();
while (rs.next()) {
BookDetails bd = new BookDetails(rs.getString(1), rs.getString(2), rs.getString(3), rs.getString(4),
rs.getFloat(5), rs.getInt(6), rs.getString(7));
books.add(bd);
}
prepStmt.close();
} catch (SQLException ex) {
throw new BooksNotFoundException(ex.getMessage());
}
Collections.sort(books);
return books;
}
public BookDetails getBookDetails(String bookId) throws BookNotFoundException {
try {
String selectStatement = "select * from books where id = ? ";
PreparedStatement prepStmt = con.prepareStatement(selectStatement);
prepStmt.setString(1, bookId);
ResultSet rs = prepStmt.executeQuery();
if (rs.next()) {
BookDetails bd = new BookDetails(rs.getString(1), rs.getString(2), rs.getString(3), rs.getString(4),
rs.getFloat(5), rs.getInt(6), rs.getString(7));
prepStmt.close();
return bd;
} else {
prepStmt.close();
throw new BookNotFoundException("Couldn't find book: " + bookId);
}
} catch (SQLException ex) {
throw new BookNotFoundException("Couldn't find book: " + bookId + ex.getMessage());
}
}
}
package database;
public class BookDetails implements Comparable {
private String bookId = null;
private String title = null;
private String firstName = null;
private String surname = null;
private float price = 0.0F;
private int year = 0;
private String description = null;
public BookDetails(String bookId, String surname, String firstName, String title,
float price, int year, String description) {
this.bookId = bookId;
this.title = title;
this.firstName = firstName;
this.surname = surname;
this.price = price;
this.year = year;
this.description = description;
}
public String getTitle() {
return title;
}
public float getPrice() {
return price;
}
public int getYear() {
return year;
}
public String getDescription() {
return description;
}
public String getBookId() {
return this.bookId;
}
public String getFirstName() {
return this.firstName;
}
public String getSurname() {
return this.surname;
}
public int compareTo(Object o) {
BookDetails n = (BookDetails)o;
int lastCmp = title.compareTo(n.title);
return (lastCmp);
}
}
package cart;
import java.util.*;
import database.BookDetails;
public class ShoppingCart {
HashMap items = null;
int numberOfItems = 0;
public ShoppingCart() {
items = new HashMap();
}
public synchronized void add(String bookId, BookDetails book) {
if(items.containsKey(bookId)) {
ShoppingCartItem scitem = (ShoppingCartItem) items.get(bookId);
scitem.incrementQuantity();
} else {
ShoppingCartItem newItem = new ShoppingCartItem(book);
items.put(bookId, newItem);
}
numberOfItems++;
}
public synchronized void remove(String bookId) {
if(items.containsKey(bookId)) {
ShoppingCartItem scitem = (ShoppingCartItem) items.get(bookId);
scitem.decrementQuantity();
if(scitem.getQuantity() <= 0)
items.remove(bookId);
numberOfItems--;
}
}
public synchronized Collection getItems() {
return items.values();
}
protected void finalize() throws Throwable {
items.clear();
}
public synchronized int getNumberOfItems() {
return numberOfItems;
}
public synchronized double getTotal() {
double amount = 0.0;
for(Iterator i = getItems().iterator(); i.hasNext(); ) {
ShoppingCartItem item = (ShoppingCartItem) i.next();
BookDetails bookDetails = (BookDetails) item.getItem();
amount += item.getQuantity() * bookDetails.getPrice();
}
return roundOff(amount);
}
private double roundOff(double x) {
long val = Math.round(x*100); // cents
return val/100.0;
}
public synchronized void clear() {
items.clear();
numberOfItems = 0;
}
}
package cart;
public class ShoppingCartItem {
Object item;
int quantity;
public ShoppingCartItem(Object anItem) {
item = anItem;
quantity = 1;
}
public void incrementQuantity() {
quantity++;
}
public void decrementQuantity() {
quantity--;
}
public Object getItem() {
return item;
}
public int getQuantity() {
return quantity;
}
}
package filters;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class CharResponseWrapper extends HttpServletResponseWrapper {
private CharArrayWriter output;
public String toString() {
return output.toString();
}
public CharResponseWrapper(HttpServletResponse response) {
super(response);
output = new CharArrayWriter();
}
public PrintWriter getWriter() {
return new PrintWriter(output);
}
}
package filters;
import java.io.*;
import java.sql.Timestamp;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import util.Counter;
public final class HitCounterFilter implements Filter {
private FilterConfig filterConfig = null;
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public void destroy() {
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
if (filterConfig == null)
return;
HttpServletRequest hr = (HttpServletRequest)request;
HttpSession session = hr.getSession();
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
if (messages == null) {
Locale locale=request.getLocale();
messages = ResourceBundle.getBundle("messages.BookstoreMessages", locale);
session.setAttribute("messages", messages);
}
StringWriter sw = new StringWriter();
PrintWriter writer = new PrintWriter(sw);
Counter counter = (Counter)filterConfig.getServletContext().getAttribute("hitCounter");
writer.println();
writer.println("=======================================================");
writer.println("The number of hits is: " + counter.incCounter());
writer.println("=======================================================");
// Log the resulting string
writer.flush();
filterConfig.getServletContext().log(sw.getBuffer().toString());
PrintWriter out = response.getWriter();
CharResponseWrapper wrapper = new CharResponseWrapper((HttpServletResponse)response);
chain.doFilter(request, wrapper);
CharArrayWriter caw = new CharArrayWriter();
caw.write(wrapper.toString().substring(0, wrapper.toString().indexOf("</body>")-1));
caw.write("<p>\n<center><center>" + messages.getString("Visitor") + "<font color='red'>" + counter.getCounter() + "</font><center>");
caw.write("\n</body></html>");
response.setContentLength(caw.toString().length());
out.write(caw.toString());
out.close();
}
public String toString() {
if (filterConfig == null)
return ("HitCounterFilter()");
StringBuffer sb = new StringBuffer("HitCounterFilter(");
sb.append(filterConfig);
sb.append(")");
return (sb.toString());
}
}
package filters;
import java.io.*;
import java.sql.Timestamp;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import database.BookDetails;
import cart.*;
import util.*;
public final class OrderFilter implements Filter {
private FilterConfig filterConfig = null;
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public void destroy() {
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
if (filterConfig == null)
return;
// Render the generic servlet request properties
StringWriter sw = new StringWriter();
PrintWriter writer = new PrintWriter(sw);
ServletContext context = filterConfig.getServletContext();
Counter counter = (Counter)context.getAttribute("orderCounter");
HttpServletRequest hsr = (HttpServletRequest)request;
HttpSession session = hsr.getSession();
ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
Currency c = (Currency)session.getAttribute("currency");
c.setAmount(cart.getTotal());
writer.println();
writer.println("=======================================================");
writer.println("The total number of orders is: " + counter.incCounter());
writer.println("This order Received at " +
(new Timestamp(System.currentTimeMillis())));
writer.println();
writer.print("Purchased by: " + request.getParameter("cardname"));
writer.println();
writer.print("Total: " + c.getFormat());
writer.println();
int num = cart.getNumberOfItems();
if (num > 0) {
Iterator i = cart.getItems().iterator();
while (i.hasNext()) {
ShoppingCartItem item = (ShoppingCartItem) i.next();
BookDetails bookDetails = (BookDetails) item.getItem();
writer.print("ISBN: " + bookDetails.getBookId());
writer.print(" Title: " + bookDetails.getTitle());
writer.print(" Quantity: " + item.getQuantity());
writer.println();
}
}
writer.println("=======================================================");
// Log the resulting string
writer.flush();
context.log(sw.getBuffer().toString());
chain.doFilter(request, response);
}
public String toString() {
if (filterConfig == null)
return ("OrderFilter()");
StringBuffer sb = new StringBuffer("OrderFilter(");
sb.append(filterConfig);
sb.append(")");
return (sb.toString());
}
}
... BookStoreServlet: init ======================================================= The number of hits is: 1 ======================================================= BannerServlet: init CatalogServlet: init BookDetailsServlet: init ShowCartServlet: init CashierServlet: init ReceiptServlet: init ======================================================= The total number of orders is: 1 This order Received at 2001-10-20 14:53:20.695 Purchased by: Gwen Canigetit Total: R$ 32,25 ISBN: 208 Title: Duke: A Biography of the Java Evangelist Quantity: 2 ISBN: 205 Title: From Oak to Java: The Revolution of a Language Quantity: 1 ======================================================= ======================================================= The number of hits is: 2 ======================================================= ======================================================= The total number of orders is: 2 This order Received at 2001-10-20 14:55:00.669 Purchased by: Gwen Canigetit Total: R$ 10,75 ISBN: 208 Title: Duke: A Biography of the Java Evangelist Quantity: 1 ======================================================= ======================================================= The number of hits is: 3 ======================================================= ======================================================= The total number of orders is: 3 This order Received at 2001-10-20 18:51:10.704 Purchased by: papi Total: R$ 82,25 ISBN: 201 Title: My Early Years: Growing up on *7 Quantity: 1 ISBN: 208 Title: Duke: A Biography of the Java Evangelist Quantity: 1 ISBN: 207 Title: The Green Project: Programming for Consumer Devices Quantity: 1 ISBN: 206 Title: Java Intermediate Bytecodes Quantity: 1 ISBN: 205 Title: From Oak to Java: The Revolution of a Language Quantity: 1 ISBN: 203 Title: Web Components for Web Developers Quantity: 1 ISBN: 202 Title: Web Servers for Fun and Profit Quantity: 1 ======================================================= ======================================================= The number of hits is: 4 =======================================================
| Servlet | Alias |
| BookStoreServlet | /enter |
| BannerServlet | /banner |
| CatalogServlet | /catalog |
| BookDetailsServlet | /bookdetails |
| ShowCartServlet | /showcart |
| CashierServlet | /cashier |
| ReceiptServlet | /receipt |
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import database.*;
import exception.*;
/**
* An HTTP Servlet that overrides the service method to return a
* simple web page.
*/
public class BookStoreServlet extends HttpServlet {
private BookDB bookDB;
public void init() throws ServletException {
bookDB = (BookDB)getServletContext().getAttribute("bookDB");
if (bookDB == null)
throw new UnavailableException("Couldn't get database.");
}
public void destroy() {
bookDB.remove();
bookDB = null;
}
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession();
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
if (messages == null) {
Locale locale=request.getLocale();
messages = ResourceBundle.getBundle("messages.BookstoreMessages", locale);
session.setAttribute("messages", messages);
}
// set content-type header before accessing the Writer
response.setContentType("text/html");
response.setBufferSize(8192);
PrintWriter out = response.getWriter();
// then write the data of the response
out.println("<html>" +
"<head><title>Duke's Bookstore</title></head>");
// Get the dispatcher; it gets the banner to the user
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher("/banner");
if (dispatcher != null)
dispatcher.include(request, response);
try {
BookDetails bd = bookDB.getBookDetails("203");
//Left cell -- the "book of choice"
out.println("<b>" + messages.getString("What") + "</b>" +
"<p>" + "<blockquote>" +
"<em><a href=\"" +
response.encodeURL(request.getContextPath() + "/bookdetails?bookId=203") +
"\">" + bd.getTitle() + "</a></em>" + messages.getString("Talk") + "</blockquote>");
//Right cell -- various navigation options
out.println("<p><a href=\"" +
response.encodeURL(request.getContextPath() + "/catalog") +
"\"><b>" + messages.getString("Start") + "</b></a></font><br>" +
"<br> " +
"<br> " +
"<br> " +
"</body>" +
"</html>");
} catch (BookNotFoundException ex) {
response.resetBuffer();
throw new ServletException(ex);
}
out.close();
}
public String getServletInfo() {
return "The BookStore servlet returns the main web page " +
"for Duke's Bookstore.";
}
}
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import database.*;
import cart.*;
/**
* This is a simple example of an HTTP Servlet. It responds to the GET
* method of the HTTP protocol.
*/
public class BannerServlet extends HttpServlet {
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
writeBanner(request, response);
}
public void doPost (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
writeBanner(request, response);
}
private void writeBanner (HttpServletRequest request,
HttpServletResponse response)
throws IOException {
PrintWriter out = response.getWriter();
out.println("<body bgcolor=\"#ffffff\">" +
"<center>" +
"<hr> <br> " +
"<h1>" +
"<font size=\"+3\" color=\"#CC0066\">Duke's </font> <img src=\"" + request.getContextPath() + "/duke.books.gif\">" +
"<font size=\"+3\" color=\"black\">Bookstore</font>" +
"</h1>" +
"</center>" +
"<br> <hr> <br> ");
}
}
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import database.*;
import cart.*;
import util.Currency;
import exception.*;
/**
* This is a simple example of an HTTP Servlet. It responds to the GET
* method of the HTTP protocol.
*/
public class CatalogServlet extends HttpServlet {
private BookDB bookDB;
public void init() throws ServletException {
bookDB = (BookDB)getServletContext().getAttribute("bookDB");
if (bookDB == null)
throw new UnavailableException("Couldn't get database.");
}
public void destroy() {
bookDB.remove();
bookDB = null;
}
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get the user's session and shopping cart
HttpSession session = request.getSession(true);
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
// If the user has no cart, create a new one
if (cart == null) {
cart = new ShoppingCart();
session.setAttribute("cart", cart);
}
// set content-type header before accessing the Writer
response.setContentType("text/html");
response.setBufferSize(8192);
PrintWriter out = response.getWriter();
// then write the data of the response
out.println("<html>" +
"<head><title>" + messages.getString("TitleBookCatalog") + "</title></head>");
// Get the dispatcher; it gets the banner to the user
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher("/banner");
if (dispatcher != null)
dispatcher.include(request, response);
//Information on the books is from the database through its front end
// Additions to the shopping cart
String bookId = request.getParameter("bookId");
if (bookId != null) {
try {
BookDetails book = bookDB.getBookDetails(bookId);
cart.add(bookId, book);
out.println("<p><h3>" + "<font color=\"#ff0000\">" + messages.getString("CartAdded1") +
"<i>" + book.getTitle() + "</i> " +
messages.getString("CartAdded2") + "</font></h3>");
} catch (BookNotFoundException ex) {
response.reset();
throw new ServletException(ex);
}
}
//Give the option of checking cart or checking out if cart not empty
if (cart.getNumberOfItems() > 0) {
out.println("<p><strong><a href=\"" +
response.encodeURL(request.getContextPath() + "/showcart") +
"\">" + messages.getString("CartCheck") + "</a> " +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/cashier") +
"\">" + messages.getString("Buy") + "</a>" +
"</p></strong>");
}
// Always prompt the user to buy more -- get and show the catalog
out.println("<br> " +
"<h3>" + messages.getString("Choose") + "</h3>" +
"<center> <table>");
try {
Collection coll = bookDB.getBooks();
Iterator i = coll.iterator();
Currency c = (Currency)session.getAttribute("currency");
if (c == null) {
c = new Currency();
c.setLocale(request.getLocale());
session.setAttribute("currency", c);
}
while (i.hasNext()) {
BookDetails book = (BookDetails)i.next();
bookId = book.getBookId();
c.setAmount(book.getPrice());
//Print out info on each book in its own two rows
out.println("<tr>" +
"<td bgcolor=\"#ffffaa\">" +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/bookdetails?bookId=" + bookId) +
"\"> <strong>" + book.getTitle() +
" </strong></a></td>" +
"<td bgcolor=\"#ffffaa\" rowspan=2>" +
c.getFormat() +
" </td>" +
"<td bgcolor=\"#ffffaa\" rowspan=2>" +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/catalog?bookId=" + bookId)
+ "\"> " + messages.getString("CartAdd") + " </a></td></tr>" +
"<tr>" +
"<td bgcolor=\"#ffffff\">" +
" " + messages.getString("By") + "<em> " + book.getFirstName() +
" " + book.getSurname() + "</em></td></tr>");
}
} catch (BooksNotFoundException ex) {
response.reset();
throw new ServletException(ex);
}
out.println("</table></center></body></html>");
out.close();
}
public String getServletInfo() {
return "The Catalog servlet adds books to the user's " +
"shopping cart and prints the catalog.";
}
}
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import database.*;
import cart.*;
import util.Currency;
import exception.*;
/**
* This is a simple example of an HTTP Servlet. It responds to the GET
* method of the HTTP protocol.
*/
public class BookDetailsServlet extends HttpServlet {
private BookDB bookDB;
public void init() throws ServletException {
bookDB = (BookDB)getServletContext().getAttribute("bookDB");
if (bookDB == null)
throw new UnavailableException("Couldn't get database.");
}
public void destroy() {
bookDB = null;
}
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession(true);
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
// set headers and buffer size before accessing the Writer
response.setContentType("text/html");
response.setBufferSize(8192);
PrintWriter out = response.getWriter();
// then write the response
out.println("<html>" +
"<head><title>" + messages.getString("TitleBookDescription") + "</title></head>");
// Get the dispatcher; it gets the banner to the user
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher("/banner");
if (dispatcher != null)
dispatcher.include(request, response);
//Get the identifier of the book to display
String bookId = request.getParameter("bookId");
if (bookId != null) {
// and the information about the book
try {
BookDetails bd = bookDB.getBookDetails(bookId);
Currency c = (Currency)session.getAttribute("currency");
if (c == null) {
c = new Currency();
c.setLocale(request.getLocale());
session.setAttribute("currency", c);
}
c.setAmount(bd.getPrice());
//Print out the information obtained
out.println("<h2>" + bd.getTitle() + "</h2>" +
" " + messages.getString("By") + " <em>" + bd.getFirstName() + " " +
bd.getSurname() + "</em> " +
"(" + bd.getYear() + ")<br> <br>" +
"<h4>" + messages.getString("Critics")+ "</h4>" +
"<blockquote>" + bd.getDescription() +
"</blockquote>" +
"<h4>" + messages.getString("Price") + c.getFormat() + "</h4>" +
"<p><strong><a href=\"" +
response.encodeURL(request.getContextPath() + "/catalog?bookId=" + bookId) +
"\">" + messages.getString("CartAdd") + "</a> " +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/catalog") + "\">" + messages.getString("ContinueShopping") + "</a></p></strong>");
} catch (BookNotFoundException ex) {
response.resetBuffer();
throw new ServletException(ex);
}
}
out.println("</body></html>");
out.close();
}
public String getServletInfo() {
return "The BookDetail servlet returns information about" +
"any book that is available from the bookstore.";
}
}
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import database.*;
import cart.*;
import util.Currency;
import exception.*;
/**
* An HTTP servlet that displays the contents of a customer's shopping
* cart at Duke's Bookstore. It responds to the GET and HEAD methods of
* the HTTP protocol. This servlet calls other servlets.
*/
public class ShowCartServlet extends HttpServlet {
private BookDB bookDB;
public void init() throws ServletException {
bookDB = (BookDB)getServletContext().getAttribute("bookDB");
if (bookDB == null)
throw new UnavailableException("Couldn't get database.");
}
public void destroy() {
bookDB.remove();
bookDB = null;
}
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get the user's session and shopping cart
HttpSession session = request.getSession(true);
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
// If the user has no cart, create a new one
if (cart == null) {
cart = new ShoppingCart();
session.setAttribute("cart", cart);
}
// set content type header before accessing the Writer
response.setContentType("text/html");
response.setBufferSize(8192);
PrintWriter out = response.getWriter();
//Print out the response
out.println("<html>" +
"<head><title>" + messages.getString("TitleShoppingCart") + "</title></head>" );
// Get the dispatcher; it gets the banner to the user
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher("/banner");
if (dispatcher != null)
dispatcher.include(request, response);
/* Handle any pending deletes from the shopping cart and
indicate the outcome as part of the response */
String bookId = request.getParameter("Remove");
BookDetails bd;
if (bookId != null) {
try {
bd = bookDB.getBookDetails(bookId);
cart.remove(bookId);
out.println("<font color=\"#ff00000\" size=\"+2\">" +
messages.getString("CartRemoved") + "<strong>" + bd.getTitle() +
"</strong> <br> <br>" +
"</font>");
} catch (BookNotFoundException ex) {
response.reset();
throw new ServletException(ex);
}
} else if (request.getParameter("Clear") != null) {
cart.clear();
out.println("<font color=\"#ff0000\" size=\"+2\"><strong>" +
messages.getString("CartCleared") +
"</strong> <br> <br> </font>");
}
// Print a summary of the shopping cart
int num = cart.getNumberOfItems();
if (num > 0) {
out.println("<font size=\"+2\">" +
messages.getString("CartContents") + num + (num==1 ? messages.getString("CartItem") : messages.getString("CartItems")) +
"</font><br> ");
// Return the Shopping Cart
out.println("<table>" +
"<tr>" +
"<th align=left>" + messages.getString("ItemQuantity") + "</TH>" +
"<th align=left>" + messages.getString("ItemTitle") + "</TH>" +
"<th align=left>" + messages.getString("ItemPrice") + "</TH>" +
"</tr>");
Iterator i = cart.getItems().iterator();
Currency c = (Currency)session.getAttribute("currency");
if (c == null) {
c = new Currency();
c.setLocale(request.getLocale());
session.setAttribute("currency", c);
}
while (i.hasNext()) {
ShoppingCartItem item = (ShoppingCartItem) i.next();
bd = (BookDetails) item.getItem();
c.setAmount(bd.getPrice());
out.println("<tr>" +
"<td align=\"right\" bgcolor=\"#ffffff\">" +
item.getQuantity() +
"</td>" +
"<td bgcolor=\"#ffffaa\">" +
"<strong><a href=\"" +
response.encodeURL(request.getContextPath() + "/bookdetails?bookId=" + bd.getBookId()) +
"\">" + bd.getTitle() + "</a></strong>" +
"</td>" +
"<td bgcolor=\"#ffffaa\" align=\"right\">" +
c.getFormat() +
"</td>" +
"<td bgcolor=\"#ffffaa\">" +
"<strong>" +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/showcart?Remove=" + bd.getBookId()) +
"\">" + messages.getString("RemoveItem") + "</a></strong>" +
"</td></tr>");
}
c.setAmount(cart.getTotal());
// Print the total at the bottom of the table
out.println("<tr><td colspan=\"5\" bgcolor=\"#ffffff\">" +
"<br></td></tr>" +
"<tr>" +
"<td colspan=\"2\" align=\"right\"" +
"bgcolor=\"#ffffff\">" +
messages.getString("Subtotal") + "</td>" +
"<td bgcolor=\"#ffffaa\" align=\"right\">" +
c.getFormat() + "</td>" +
"</td><td><br></td></tr></table>");
// Where to go and what to do next
out.println("<p> <p><strong><a href=\"" +
response.encodeURL(request.getContextPath() + "/catalog") +
"\">" + messages.getString("ContinueShopping") + "</a> " +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/cashier") +
"\">" + messages.getString("Checkout") + "</a> " +
"<a href=\"" +
response.encodeURL(request.getContextPath() + "/showcart?Clear=clear") +
"\">" + messages.getString("ClearCart") + "</a></strong>");
} else {
// Shopping cart is empty!
out.println("<font size=\"+2\">" +
messages.getString("CartEmpty") + "</font>" +
"<br> <br>" +
"<center><a href=\"" +
response.encodeURL(request.getContextPath() + "/catalog") +
"\">" + messages.getString("Catalog") + "</a> </center>");
}
out.println("</body> </html>");
out.close();
}
public String getServletInfo() {
return "The ShowCart servlet returns information about" +
"the books that the user is in the process of ordering.";
}
}
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import cart.*;
import util.Currency;
/**
* An HTTP Servlet that responds to the GET method of the
* HTTP protocol. It returns a form to the user that gathers data.
* The form POSTs to another servlet.
*/
public class CashierServlet extends HttpServlet {
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get the user's session and shopping cart
HttpSession session = request.getSession();
ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
ShoppingCart cart =
(ShoppingCart)session.getAttribute("cart");
if (cart == null) {
cart = new ShoppingCart();
session.setAttribute("cart", cart);
}
// set content-type header before accessing Writer
response.setContentType("text/html");
PrintWriter out = response.getWriter();
Currency c = (Currency)session.getAttribute("currency");
if (c == null) {
c = new Currency();
c.setLocale(request.getLocale());
session.setAttribute("currency", c);
}
c.setAmount(cart.getTotal());
// then write the data of the response
out.println("<html>" +
"<head><title>" + messages.getString("TitleCashier") + "</title></head>");
// Get the dispatcher; it gets the banner to the user
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher("/banner");
if (dispatcher != null)
dispatcher.include(request, response);
// Print out the total and the form for the user
out.println("<p>" + messages.getString("Amount") +
"<strong>" + c.getFormat() + "</strong>" +
"<p>" + messages.getString("Purchase") +
"<form action=\"" +
response.encodeURL(request.getContextPath() + "/receipt") +
"\" method=\"post\">" +
"<table>" +
"<tr>" +
"<td><strong>" + messages.getString("Name")+ "</strong></td>" +
"<td><input type=\"text\" name=\"cardname\"" +
"value=\"Gwen Canigetit\" size=\"19\"></td>" +
"</tr>" +
"<tr>" +
"<td><strong>" + messages.getString("CCNumber") + "</strong></td>" +
"<td>" +
"<input type=\"text\" name=\"cardnum\" " +
"value=\"xxxx xxxx xxxx xxxx\" size=\"19\"></td>" +
"</tr>" +
"<tr>" +
"<td></td>" +
"<td><input type=\"submit\"" +
"value=\"" + messages.getString("Submit") + "\"></td>" +
"</tr>" +
"</table>" +
"</form>" +
"</body>" +
"</html>");
out.close();
}
public String getServletInfo() {
return "The Cashier servlet takes the user's name and " +
"credit card number so that the user can buy the books.";
}
}
<html> <head> <title>Server Error</title> </head> <body bgcolor="white"> <h2>The application is unavailable. Please try later.</h2> </body> </html>
C:\...\src>ant livros
Buildfile: build.xml
init:
livros:
[mkdir] Created dir: C:\...\build\livros
[copy] Copying 2 files to C:\...\build\livros
[javac] Compiling 22 source files to C:\...\build\livros
BUILD SUCCESSFUL
Total time: 7 seconds
DROP TABLE books;
CREATE TABLE books
(id VARCHAR(8)
CONSTRAINT pk_books PRIMARY KEY,
surname VARCHAR(24),
first_name VARCHAR(24),
title VARCHAR(96),
price FLOAT,
yr INT,
description VARCHAR(30));
DELETE FROM books;
INSERT INTO books VALUES('201', 'Duke', '',
'My Early Years: Growing up on *7',
10.75, 1995, 'What a cool book.');
INSERT INTO books VALUES('202', 'Jeeves', '',
'Web Servers for Fun and Profit', 10.75,
2000, 'What a cool book.');
INSERT INTO books VALUES('203', 'Masterson', 'Webster',
'Web Components for Web Developers',
17.75, 2000, 'What a cool book.');
INSERT INTO books VALUES('205', 'Novation', 'Kevin',
'From Oak to Java: The Revolution of a Language',
10.75, 1998, 'What a cool book.');
INSERT INTO books VALUES('206', 'Gosling', 'James',
'Java Intermediate Bytecodes', 10.75,
2000, 'What a cool book.');
INSERT INTO books VALUES('207', 'Thrilled', 'Ben',
'The Green Project: Programming for Consumer Devices',
10.75, 1998, 'What a cool book');
INSERT INTO books VALUES('208', 'Tru', 'Itzal',
'Duke: A Biography of the Java Evangelist',
10.75, 2001, 'What a cool book.');
j2ee -stop j2eeadmin -addJdbcDatasource jdbc/BookDB jdbc:cloudscape:rmi:BookDB;create=true
j2ee -verbose
Binding DataSource, name = jdbc/BookDB, url = jdbc:cloudscape:rmi:BookDB;create=true
livros programa