Sun Mar 24, 2013 7:24 pm
<%@ page language="java"
contentType="text/html; charset=windows-1256"
pageEncoding="windows-1256"
%>
<%
response.setHeader("Cache-Control","no-store, must-revalidate");
response.setHeader("Pragma","no-cache");
response.setDateHeader ("Expires", -1);
new java.util.Date();
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1256">
<script>
function clearForms()
{
var i;
for (i = 0; (i < document.forms.length); i++) {
document.forms[i].reset();
}
}
function validateForm()
{
var x=document.forms["myForm"]["un"].value;
if (x==null || x=="")
{
alert("Username must be filled out");
document.getElementById('un').focus();
return false;
}
var y=document.forms["myForm"]["pw"].value;
if (y==null || y=="")
{
alert("password must be filled out");
document.getElementById('pw').focus();
return false;
}
}
</script>
<title>Login Page</title>
</head>
<body onLoad="clearForms()" onunload="clearForms()">
<form action="LoginServlet" onsubmit="return validateForm()" method="post" name="myForm">
Please enter your user name
<input type="text" name="un" id="un"/><br>
Please enter your password
<input type="text" name="pw" id="pw"/>
<input type="submit" value="submit">
</form>
</body>
</html>
<%@ page language="java"
contentType="text/html; charset=windows-1256"
pageEncoding="windows-1256"
%>
<%
response.setHeader("Cache-Control","no-store,must-revalidate");
response.setHeader("Pragma","no-cache");
response.setDateHeader ("Expires", -1);
new java.util.Date();
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1256">
<title>Invalid Login</title>
</head>
<body>
<center>
Sorry, you are not a registered user! Please sign up first
</center>
</body>
</html>
<%@ page language="java"
contentType="text/html; charset=windows-1256"
pageEncoding="windows-1256"
import="ExamplePackage.UserBean"
%>
<%
response.setHeader("Cache-Control","no-store,must-revalidate");
response.setHeader("Pragma","no-cache");
response.setDateHeader ("Expires", -1);
new java.util.Date();
if(session.getAttribute("currentSessionUser")!=null)
{
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1256">
<title> User Logged Successfully </title>
<SCRIPT type="text/javascript">
function noBack() {
window.history.forward();
}
</SCRIPT>
</head>
<BODY onload="noBack();">
<a href="LogoutServlet">Logout</a>
<center>
<% UserBean currentUser = (UserBean)(session.getAttribute("currentSessionUser"));%>
Welcome <%= currentUser.getFirstName() + " " + currentUser.getLastName() %>
</center>
</body>
</html>
<%}
else
response.sendRedirect("LoginPage.jsp");%>package ExamplePackage;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 2562294252731783855L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
try
{
UserBean user = new UserBean();
user.setUserName(request.getParameter("un"));
user.setPassword(request.getParameter("pw"));
user = UserDAO.login(user);
if (user.isValid())
{
HttpSession session = request.getSession(true);
session.setAttribute("currentSessionUser",user);
response.sendRedirect("userLogged.jsp"); //logged-in page
}
else
response.sendRedirect("invalidLogin.jsp"); //error page
}
catch (Throwable theException)
{
System.out.println(theException);
}
}
}
package ExamplePackage;
public class UserBean {
private String username;
private String password;
private String firstName;
private String lastName;
public boolean valid;
public String getFirstName() {
return firstName;
}
public void setFirstName(String newFirstName) {
firstName = newFirstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String newLastName) {
lastName = newLastName;
}
public String getPassword() {
return password;
}
public void setPassword(String newPassword) {
password = newPassword;
}
public void removePassword() {
password = null;
}
public String getUsername() {
return username;
}
public void setUserName(String newUsername) {
username = newUsername;
}
public void removeUserName() {
username = null;
}
public void removeLastName() {
lastName = null;
}
public void removeFirstName() {
firstName = null;
}
public boolean isValid() {
return valid;
}
public void setValid(boolean newValid) {
valid = newValid;
}
}
package ExamplePackage;
import java.sql.*;
public class UserDAO
{
static Connection currentCon = null;
static ResultSet rs = null;
public static UserBean login(UserBean bean) {
//preparing some objects for connection
Statement stmt = null;
String username = bean.getUsername();
String password = bean.getPassword();
String searchQuery =
"select * from users where username='"
+ username
+ "' AND password='"
+ password
+ "'";
// "System.out.println" prints in the console; Normally used to trace the process
System.out.println("Your user name is " + username);
System.out.println("Your password is " + password);
System.out.println("Query: "+searchQuery);
try
{
//connect to DB
currentCon = ConnectionManager.getConnection();
stmt=currentCon.createStatement();
rs = stmt.executeQuery(searchQuery);
boolean more = rs.next();
// if user does not exist set the isValid variable to false
if (!more)
{
System.out.println("Sorry, you are not a registered user! Please sign up first");
bean.setValid(false);
}
//if user exists set the isValid variable to true
else if (more)
{
String firstName = rs.getString("FirstName");
String lastName = rs.getString("LastName");
System.out.println("Welcome " + firstName);
bean.setFirstName(firstName);
bean.setLastName(lastName);
bean.setValid(true);
}
}
catch (Exception ex)
{
System.out.println("Log In failed: An Exception has occurred! " + ex);
}
//some exception handling
finally
{
if (rs != null) {
try {
rs.close();
} catch (Exception e) {}
rs = null;
}
if (stmt != null) {
try {
stmt.close();
} catch (Exception e) {}
stmt = null;
}
if (currentCon != null) {
try {
currentCon.close();
} catch (Exception e) {
}
currentCon = null;
}
}
return bean;
}
}
package ExamplePackage;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
public class ConnectionManager {
static Connection con;
static String url;
public static Connection getConnection()
{
try
{
String url ="jdbc:oracle:thin:@localhost:1521:XE";
Class.forName("oracle.jdbc.driver.OracleDriver");
try
{
con = DriverManager.getConnection(url,"*******","*******");
}
catch (SQLException ex)
{
ex.printStackTrace();
}
}
catch(ClassNotFoundException e)
{
System.out.println(e);
}
return con;
}
}
package ExamplePackage;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import ExamplePackage.UserBean;
public class LogoutServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
try
{
UserBean user = new UserBean();
user.removeUserName();
user.removePassword();
HttpSession session=request.getSession(false);
session.removeAttribute("currentSessionUser");
session.invalidate();
response.sendRedirect("LoginPage.jsp");
}
catch (Throwable theException)
{
System.out.println(theException);
}
}
}
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