login.html
Các bài toán lập trình liên quan đến web
login.html
LOGIN
Username
Password
New user ?
Account.java
package myEntities;
public class Account {
private String username;
private String password;
public Account(String username, String password) {
this.username = username;
this.password = password;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
ConfigDB.java
package myEntities;
import javax.servlet.ServletContext;
public class ConfigDB {
private String driverDB, urlDB, userDB, passDB;
public ConfigDB(ServletContext context) {
this.driverDB = context.getInitParameter("DriverDB").trim();
this.urlDB = context.getInitParameter("UrlDB").trim();
this.userDB = context.getInitParameter("UserDB").trim();
this.passDB = context.getInitParameter("PassDB").trim();
}
public String getDriverDB() {
return driverDB;
}
public void setDriverDB(String driverDB) {
this.driverDB = driverDB;
}
public String getPassDB() {
return passDB;
}
public void setPassDB(String passDB) {
this.passDB = passDB;
}
public String getUrlDB() {
return urlDB;
}
public void setUrlDB(String urlDB) {
this.urlDB = urlDB;
}
public String getUserDB() {
return userDB;
}
public void setUserDB(String userDB) {
this.userDB = userDB;
}
}
AccountDAO.java
package myDAOs;
import myEntities.*;
import java.sql.*;
public class AccountDAO {
private ConfigDB cfgDB;
public AccountDAO(ConfigDB cfgDB) {
this.cfgDB = cfgDB;
}
private Connection createConnection() throws Exception {
Class.forName(cfgDB.getDriverDB());
Connection con =
DriverManager.getConnection(cfgDB.getUrlDB(),cfgDB.getUserDB(),cfgDB.getPassDB());
return con;
}
public boolean isExistAccount(Account account) throws Exception {
String strQuery = "SELECT * FROM Account WHERE Username=? AND Password=?";
PreparedStatement pst = createConnection().prepareStatement(strQuery);
pst.setString(1, account.getUsername());
pst.setString(2, account.getPassword());
ResultSet rs = pst.executeQuery();
if (rs.next())
return true;
else
return false;
}
public boolean insertAccount(Account account) throws Exception {
String strQuery = "INSERT INTO Account VALUES(?,?)";
PreparedStatement pst = createConnection().prepareStatement(strQuery);
pst.setString(1, account.getUsername());
pst.setString(2, account.getPassword());
int rowsAffect = pst.executeUpdate();
if (rowsAffect > 0) return true;
else return false;
}
}
ControllerServlet.java
package myServlets;
import myEntities.*;
import myDAOs.*;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ControllerServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String action = request.getParameter("action");
if (action.equals("loginUser")) {
handleLoginUser(request, response);
} else if (action.equals("home")) {
response.sendRedirect("login.html");
} else if (action.equals("formRegister")) {
response.sendRedirect("register.html");
} else if (action.equals("registerUser")) {
handleRegisterUser(request, response);
} else if (action.equals("pagingPage")) {
String pageID = request.getParameter("pageID");
response.sendRedirect("book-list.jsp?pageID=" + pageID);
} else if (action.equals("formNewBook")) {
response.sendRedirect("book-new.html");
} else if (action.equals("newBook")) {
handleNewBook(request, response);
} else if (action.equals("deleteBook")) {
handleDeleteBook(request, response);
} else if (action.equals("formEditBook")) {
String strCode = request.getParameter("code");
response.sendRedirect("book-edit.jsp?code=" + strCode);
} else if (action.equals("editBook")) {
handleEditBook(request, response);
} else if (action.equals("logoutUser")) {
request.getSession(true).removeAttribute("username");
response.sendRedirect("ControllerServlet?action=home");
}
}
private void handleLoginUser(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String strUser = request.getParameter("txtUsername");
String strPass = request.getParameter("txtPassword");
Account acc = new Account(strUser, strPass);
ConfigDB cfgDB = new ConfigDB(this.getServletContext());
AccountDAO accDAO = new AccountDAO(cfgDB);
boolean result = false;
try {
if (accDAO.isExistAccount(acc)) {
request.getSession(true).setAttribute("username", strUser);
result = true;
}
} catch (Exception ex) { ex.printStackTrace(); }
if (result)
response.sendRedirect("book-list.jsp");
else
response.sendRedirect("login-fail.html");
}
private void handleRegisterUser(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String strUser = request.getParameter("txtUsername");
String strPass = request.getParameter("txtPassword");
Account acc = new Account(strUser, strPass);
ConfigDB cfgDB = new ConfigDB(this.getServletContext());
AccountDAO accDAO = new AccountDAO(cfgDB);
boolean result = false;
try {
if (accDAO.insertAccount(acc))
result = true;
} catch (Exception ex) { ex.printStackTrace(); }
if (result)
response.sendRedirect("ControllerServlet?action=home");
else
response.sendRedirect("register-fail.html");
}
private void handleNewBook(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = request.getParameter("txtBookName");
String author = request.getParameter("txtBookAuthor");
String price = request.getParameter("txtBookPrice");
Book b = new Book(0, name, author, Integer.parseInt(price));
ConfigDB cfgDB = new ConfigDB(this.getServletContext());
BookDAO bDAO = new BookDAO(cfgDB);
boolean result = false;
try {
if (bDAO.insertBook(b))
result = true;
} catch (Exception ex) { ex.printStackTrace(); }
if (result)
response.sendRedirect("book-list.jsp");
else
response.sendRedirect("book-fail.html");
}
private void handleDeleteBook(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String strCode = request.getParameter("code");
ConfigDB cfgDB = new ConfigDB(this.getServletContext());
BookDAO bDAO = new BookDAO(cfgDB);
boolean result = false;
try {
if (bDAO.deleteBook(Integer.parseInt(strCode)))
result = true;
} catch (Exception ex) { ex.printStackTrace(); }
if (result)
response.sendRedirect("book-list.jsp");
else
response.sendRedirect("book-fail.html");
}
private void handleEditBook(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String code = request.getParameter("txtBookCode");
String name = request.getParameter("txtBookName");
String author = request.getParameter("txtBookAuthor");
String price = request.getParameter("txtBookPrice");
Book b = new Book(Integer.parseInt(code), name, author, Integer.parseInt(price));
ConfigDB cfgDB = new ConfigDB(this.getServletContext());
BookDAO bDAO = new BookDAO(cfgDB);
boolean result = false;
try {
if (bDAO.updateBook(b))
result = true;
} catch (Exception ex) { ex.printStackTrace(); }
if (result)
response.sendRedirect("book-list.jsp");
else
response.sendRedirect("book-fail.html");
}
}
login-fail.html
LOGIN
Invalid user ... Please, login again
Book.java
package myEntities;
public class Book {
private int code;
private String name;
private String author;
private int price;
public Book(int code, String name, String author, int price) {
this.code = code;
this.name = name;
this.author = author;
this.price = price;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
}
BookDAO.java
package myDAOs;
import myEntities.*;
import java.sql.*;
import java.util.*;
public class BookDAO {
private ConfigDB cfgDB;
public BookDAO(ConfigDB cfgDB) {
this.cfgDB = cfgDB;
}
private Connection createConnection() throws Exception {
Class.forName(cfgDB.getDriverDB());
Connection con =
DriverManager.getConnection(cfgDB.getUrlDB(),cfgDB.getUserDB(),cfgDB.getPassDB());
return con;
}
public ArrayList getAllBooks() throws Exception {
ArrayList result = new ArrayList();
String strQuery = "SELECT * FROM Book";
Statement st = createConnection().createStatement();
ResultSet rs = st.executeQuery(strQuery);
while (rs.next()) {
Book book = new Book(rs.getInt("BookCode"), rs.getString("BookName"),
rs.getString("BookAuthor"), rs.getInt("BookPrice"));
result.add(book);
}
return result;
}
public ArrayList getBooks(int numOfRowsOnePage, int indexOfPage) throws Exception {
ArrayList result = new ArrayList();
int startRow = (indexOfPage - 1) * numOfRowsOnePage;
String strQuery = " SELECT TOP " + numOfRowsOnePage + " * FROM Book WHERE
BookCode NOT IN";
strQuery += " (SELECT TOP " + startRow + " BookCode FROM Book ORDER BY
BookCode)";
strQuery += " ORDER BY BookCode";
Statement st = createConnection().createStatement();
ResultSet rs = st.executeQuery(strQuery);
while (rs.next()) {
Book book = new Book(rs.getInt("BookCode"), rs.getString("BookName"),
rs.getString("BookAuthor"), rs.getInt("BookPrice"));
result.add(book);
}
return result;
}
public int getRowCount() throws Exception {
String strQuery = "SELECT COUNT(*) FROM Book";
Statement st = createConnection().createStatement();
ResultSet rs = st.executeQuery(strQuery);
if (rs.next())
return rs.getInt(1);
else
return 0;
}
public boolean insertBook(Book book) throws Exception {
String strQuery = "INSERT INTO Book VALUES(?,?,?)";
PreparedStatement pst = createConnection().prepareStatement(strQuery);
pst.setString(1, book.getName());
pst.setString(2, book.getAuthor());
pst.setInt(3, book.getPrice());
int rowsAffect = pst.executeUpdate();
if (rowsAffect > 0) return true;
else return false;
}
public boolean deleteBook(int code) throws Exception {
String strQuery = "DELETE FROM Book WHERE BookCode=?";
PreparedStatement pst = createConnection().prepareStatement(strQuery);
pst.setInt(1, code);
int rowsAffect = pst.executeUpdate();
if (rowsAffect > 0) return true;
else return false;
}
public Book getBook(int code) throws Exception {
Book book = new Book(code, "", "", 0);
String strQuery = "SELECT * FROM Book WHERE BookCode=?";
PreparedStatement pst = createConnection().prepareStatement(strQuery);
pst.setInt(1, code);
ResultSet rs = pst.executeQuery();
if (rs.next()) {
book.setName(rs.getString("BookName"));
book.setAuthor(rs.getString("BookAuthor"));
book.setPrice(rs.getInt("BookPrice"));
}
return book;
}
public boolean updateBook(Book book) throws Exception {
String strQuery = "UPDATE Book SET BookName=?, BookAuthor=?, BookPrice=? WHERE
BookCode=?";
PreparedStatement pst = createConnection().prepareStatement(strQuery);
pst.setString(1, book.getName());
pst.setString(2, book.getAuthor());
pst.setInt(3, book.getPrice());
pst.setInt(4, book.getCode());
int rowsAffect = pst.executeUpdate();
if (rowsAffect > 0) return true;
else return false;
}
}
book-list.jsp
JSP Page
LIST BOOK
Book Code
Book Name
Book Author
Book Price
Management
ArrayList arrBooks = bDAO.getBooks(numOfRowsOnePage, pageID);
String strRows = "";
for(Book book : arrBooks) {
strRows += "";
strRows += "" + book.getCode() + "";
strRows += "" + book.getName() + "";
strRows += "" + book.getAuthor() + "";
strRows += "" + book.getPrice() + "";
strRows += "Edit";
strRows += "Delete";
strRows += "";
}
out.print(strRows);
%>
New Book ?
Logout
register.html
REGISTER
Username
Password
register-fail.html
ACTION USER
Insert user fail ... Please, register
again
book-new.html
NEW BOOK
Book Name
Book Author
Book Price
book-fail.html
BOOK
Action fail ...
book-edit.jsp
JSP Page
BOOK DETAILS
Book Code
Book Name
Book Author
Book Price
