July 2013 ~ ●.. My B.Tech ..● 2K8618.blogspot.com

Struts Login Form Example Eclipse MySql Apache Tomcat

Struts Login Example

Struts 1.3 Java Eclipse MySql Apache Tomcat

Project Screenshot:

Project Explorer:

Source code:

struts-config.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
          "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>

    <!-- Form Beans -->
    <form-beans>
        
        <form-bean name="loginForm" type="com.loginexample.forms.LoginForm"/>

    </form-beans>

    <!-- Action Mappings -->
    <action-mappings>

     <action name="loginForm" path="/Login" type="com.loginexample.actions.LoginAction" scope="request" input="/Login.jsp">
         <forward name="failure" path="/Failure.jsp" redirect="true"/>
         <forward name="success" path="/Success.jsp" redirect="true"/>
     </action>

    </action-mappings>
    
    <!-- Message Source -->
     <message-resources parameter="com.loginexample.resources.Application"/>

</struts-config>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>StrutsLoginFormExample</display-name>
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>
          /WEB-INF/struts-config.xml
       </param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

Login.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@taglib prefix="html" uri="http://struts.apache.org/tags-html"%>
<%@taglib prefix="logic" uri="http://struts.apache.org/tags-logic"%>
<%@taglib prefix="bean" uri="http://struts.apache.org/tags-bean"%>
<!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=ISO-8859-1">
<title><bean:message key="loginform.label.title"/></title>
</head>
<body>
<center>
<h1><bean:message key="loginform.label.title"/></h1>
<html:form action="/Login" focus="username">
<table>
<tr><td>
 <bean:message key="loginform.label.usernane"/>
 </td>
 <td>
   <html:text property="username"/>
  </td>
  <td>
  <logic:messagesPresent property="username">
   <html:messages id="error" property="username">
    <font color="red"><bean:write name="error"/></font>
   </html:messages>
  </logic:messagesPresent>
 </td></tr>
<tr><td>
  <bean:message key="loginform.label.password"/>
 </td>
 <td>
  <html:password property="paswd"/>
 </td>
 <td> 
 <logic:messagesPresent property="paswd">
  <html:messages id="error" property="paswd">
   <font color="red"><bean:write name="error"/></font>
  </html:messages>
 </logic:messagesPresent>
 </td></tr>
<tr><td></td>
  <td align="left">
 <html:submit value="Login"/>
 <html:reset value="Cancel"/>
 </td>
  <td>
 </td></tr>
</table>
</html:form>
</center>
</body>
</html>

Success.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Login Successful</title>
</head>
<body>
 <h1>Login Successful</h1>
</body>
</html>

Failure.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Login Failure</title>
</head>
<body>
 <h1 style="color: red;">Login Failure</h1>
</body>
</html>

LoginForm.java

package com.loginexample.forms;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;

public class LoginForm extends ActionForm {


 /**
  * nn
  */
 private static final long serialVersionUID = 1L;
 private String username = null;
 private String paswd = null;
 
 public String getUsername() {
  return username;
 }
 
 public void setUsername(String username) {
  this.username = username;
 }
 
 public String getpaswd() {
  return paswd;
 }
 
 public void setpaswd(String paswd) {
  this.paswd = paswd;
 }
 
 @Override
 public void reset(ActionMapping mapping, HttpServletRequest request) {
  this.paswd = null;
 }
 public ActionErrors validate(ActionMapping mapping,
   HttpServletRequest request) {
  ActionErrors errors = new ActionErrors();
  if(username==null || username.length()==0 || username.trim().equals(""))
  {
   ActionMessage message = new ActionMessage("loginform.username.empty");
   errors.add("username", message);
  }
  else if(!username.matches("^[a-zA-Z0-9 ]+$"))
  {
   errors.add("username", new ActionMessage("loginform.username.alphabets"));
  }
  else if(username.length()<3)
  {
   errors.add("username", new ActionMessage("loginform.username.length"));
   
  }
  if(paswd==null||paswd.length()==0||paswd.trim().equals(""))
  {
   errors.add("paswd", new ActionMessage("loginform.paswd"));
  }
  
 
 return errors;
 }
 

}

LoginAction,java

package com.loginexample.actions;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.loginexample.forms.LoginForm;
import com.loginexample.services.LoginService;

public class LoginAction extends Action {
 @Override
 public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {
  LoginForm loginForm = (LoginForm)form;
  LoginService loginService= new LoginService();
  
  try
  {
   loginService.checkLogin(loginForm);
   return mapping.findForward("success");
  }
  catch (Exception e)
  {
   return mapping.findForward("failure");
  }
 
 }

}

LoginService.java

package com.loginexample.services;

import java.sql.SQLException;

import com.loginexample.dao.impl.LoginDaoImplementation;
import com.loginexample.exceptions.InvalidUserException;
import com.loginexample.forms.LoginForm;

public class LoginService {
 public boolean checkLogin(LoginForm loginForm) throws SQLException, InvalidUserException
 {
  LoginDaoImplementation loginDao= new LoginDaoImplementation();
  if(!loginDao.checkLogin(loginForm))
    throw new InvalidUserException("Incorrect Username/Password.");
  else
   return true;
 }

}

LoginDao.java

package com.loginexample.dao;

import java.sql.SQLException;

import com.loginexample.forms.LoginForm;

public interface LoginDao 
{
public boolean checkLogin(LoginForm loginForm) throws SQLException;
}

LoginDaoImplementation.java

package com.loginexample.dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.loginexample.dao.LoginDao;
import com.loginexample.forms.LoginForm;
import com.loginexample.utilities.DBUtilities;

public class LoginDaoImplementation implements LoginDao
{
 public boolean checkLogin(LoginForm loginForm) throws SQLException
 {
  Connection con=null;
  boolean access=false;
  
  try
  {
   con=DBUtilities.getConnection();
   
   String query= "select * from login where username=? and password=?";
   PreparedStatement stmt= con.prepareStatement(query);
   stmt.setString(1, loginForm.getUsername());
   stmt.setString(2, loginForm.getpaswd());
   ResultSet rs= stmt.executeQuery();
   
   if(rs.next())
   {
    access=true;
   }
  
   
  }
  finally
  {
   DBUtilities.closeConnection(con);
  }
  return access;
 }
}

DBUtilities.java

package com.loginexample.utilities;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class DBUtilities {
 
    public static Connection getConnection()
    {
     Connection con = null;
     
     try 
     {
    Class.forName("com.mysql.jdbc.Driver");
    con  =DriverManager.getConnection("jdbc:mysql://localhost:3306/nn","root","");
     } 
     catch (ClassNotFoundException e) 
     {
   // TODO Auto-generated catch block
      e.printStackTrace();
     } 
     catch (SQLException e) 
     {
   // TODO Auto-generated catch block
      e.printStackTrace();
     }
     
     return con; 
     
    }
 
     public static void closeConnection(Connection con){      
      if(con!=null){
       try{
       con.close();
       }catch(SQLException e){}
      }      
     }   
       public static void closePreparedStatement(PreparedStatement ps){      
      if(ps!=null){
       try{
       ps.close();
       }catch(SQLException e){}
      }
      
     }

}

InvalidUserException.java

package com.loginexample.exceptions;

public class InvalidUserException extends Exception
{

 /**
  * 
  */
 private static final long serialVersionUID = 1L;

 public InvalidUserException(String arg0) 
 {
  super(arg0);
 }
 

 
}

Application.properties

loginform.label.title=Login Form
loginform.label.usernane=Username : 
loginform.label.password=Password : 
loginform.username.empty=Please enter username
loginform.username.alphabets=Please enter alphabets only
loginform.username.length=Please enter username of length of at least 3 characters
loginform.paswd=Please enter password

Download: StrutsLoginFormExample

Registration Form - Struts 1.3 Example - Eclipse - MySQL - Apache Tomcat

Simple Struts Example: Registration Form

Struts 1.3 - Java - MySQL- Eclipse - Apache Tomcat

Project Screenshots:

Project Explorer:

Source code:

struts-config.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
          "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>

    
    <form-beans>
        
  <form-bean name="registrationForm" type="com.loginexample.forms.RegistrationForm"/>

    </form-beans>

    
    <action-mappings>

     <action name="registrationForm" path="/register" type="com.loginexample.actions.RegistrationAction" scope="request" input="/Register.jsp">
         <forward name="failure" path="/Failure.jsp" redirect="true"/>
         <forward name="success" path="/Success.jsp" redirect="true"/>
     </action>

    </action-mappings>
     

</struts-config>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>StrutsLoginFormExample</display-name>
  <!-- WWW.2K8618.BLOGSPOT.COM -->
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>
          /WEB-INF/struts-config.xml
       </param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

Register.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"   pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<!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=ISO-8859-1">
<title>Registration Form</title>
</head>
<body>
<center>
<h1>Registration Form </h1>
<html:form action="/register" >
 Username : <html:text property="username"/><br/>
 <br/>
 Password : <html:password property="paswd"/><br/>
 <br/>
 <html:submit value="Register" />
</html:form>
</center>
</body>
</html>

RegistrationForm.java

package com.loginexample.forms;

import org.apache.struts.action.ActionForm;


public class RegistrationForm extends ActionForm
{
  /**
  * 
  */
 private static final long serialVersionUID = 1L;
  private String username = null;
  private String paswd = null;
  
  public String getUsername() {
   return username;
  }
  
  public void setUsername(String username) {
   this.username = username;
  }
  
  public String getpaswd() {
   return paswd;
  }
  
  public void setpaswd(String paswd) {
   this.paswd = paswd;
  }
}

RegistrationAction.java

package com.loginexample.actions;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.loginexample.forms.RegistrationForm;
import com.loginexample.services.LoginService;

public class RegistrationAction extends Action {
 @Override
 public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {
  RegistrationForm regForm=(RegistrationForm) form;
  LoginService loginService= new LoginService();
  
  try
  {
   if(loginService.addLogin(regForm))
    return mapping.findForward("success");
   else
    return mapping.findForward("failure");
  }
  catch (Exception e)
  {
   return mapping.findForward("failure");
  }
 
 }

}

LoginService.java

package com.loginexample.services;

import java.sql.SQLException;

import com.loginexample.dao.impl.LoginDaoImplementation;
import com.loginexample.forms.RegistrationForm;

public class LoginService {
 LoginDaoImplementation loginDao= new LoginDaoImplementation();
 
 public boolean addLogin(RegistrationForm regForm) throws SQLException
 {
  if(loginDao.addLogin(regForm))
   return true;
  else
   return false;
 }
}

LoginDao.java

package com.loginexample.dao;

import java.sql.SQLException;

import com.loginexample.forms.RegistrationForm;

public interface LoginDao 
{
 public boolean addLogin(RegistrationForm regForm) throws SQLException;
}

LoginDaoImplementation.java

package com.loginexample.dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import com.loginexample.dao.LoginDao;
import com.loginexample.forms.RegistrationForm;
import com.loginexample.utilities.DBUtilities;

public class LoginDaoImplementation implements LoginDao
{
 public boolean addLogin(RegistrationForm regForm) throws SQLException
 {
  Connection con=null;
  boolean access=false;
  
  try
  {
   con=DBUtilities.getConnection();
   
   String query= "insert into login values (?,?)";
   PreparedStatement stmt= con.prepareStatement(query);
   stmt.setString(1, regForm.getUsername());
   stmt.setString(2, regForm.getpaswd());
   int result= stmt.executeUpdate();
   
   if(result>0)
   {
    access=true;
   }
  }
  finally
  {
   DBUtilities.closeConnection(con);
  }
  return access;
 }
}

DBUtilities.java

package com.loginexample.utilities;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class DBUtilities {
 
    public static Connection getConnection()
    {
     Connection con = null;
     
     try 
     {
    Class.forName("com.mysql.jdbc.Driver");
    con  =DriverManager.getConnection("jdbc:mysql://localhost:3306/nn","root","nn");
     } 
     catch (ClassNotFoundException e) 
     {
   // TODO Auto-generated catch block
      e.printStackTrace();
     } 
     catch (SQLException e) 
     {
   // TODO Auto-generated catch block
      e.printStackTrace();
     }
     
     return con; 
     
    }
 
     public static void closeConnection(Connection con){      
      if(con!=null){
       try{
       con.close();
       }catch(SQLException e){}
      }      
     }   
       public static void closePreparedStatement(PreparedStatement ps){      
      if(ps!=null){
       try{
       ps.close();
       }catch(SQLException e){}
      }
      
     }

}

Success.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Registration Successful</title>
</head>
<body>
<center>
 <h1>Registration Successful</h1>
</center> 
</body>
</html>

Failure.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Registration Failure</title>
</head>
<body>
<center>
 <h1 style="color: red;">Registration Failed.</h1>
</center>
</body>
</html>

MySql Database

mysql> desc login;
+----------+-------------+------+-----+---------+-------+
| Field    | Type        | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| username | varchar(20) | YES  |     | NULL    |       |
| password | varchar(25) | YES  |     | NULL    |       |
+----------+-------------+------+-----+---------+-------+
2 rows in set (0.06 sec)

Download: StrutsExampleRegistration

JSP PreparedStatement Example - Login -Java - Eclipse - Apache Tomcat

Java Login Example

JSP - PreparedStatement - MySQL- Eclipse - Apache Tomcat

Notes:

PreparedStatement can be used to prevent sql injection.

Project:

Project Explorer:

Source code:

LoginDao.java

package com.login.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.login.model.Login;
import com.login.utilities.DBUtilities;

public class LoginDao 
{
 public boolean checkLogin(Login login) throws SQLException
 {
  Connection con=null;
  try{
 
  con=DBUtilities.getConnection();
  
  String query="select * from sec_login where username=? and password=?";
  PreparedStatement pst= con.prepareStatement(query);
  pst.setString(1, login.getUsername());
  pst.setString(2, login.getPassword());
  ResultSet rs= pst.executeQuery();
 
  if(rs.next())
  {
   return true;
  }
  else 
  {
   return false;
  }
   
  }
  finally{
   DBUtilities.closeConnection(con);
  }
 }
 
}

DBUtilities.java

package com.login.utilities;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class DBUtilities {
 
    public static Connection getConnection(){
     Connection con = null;
     
     try {
   Class.forName("com.mysql.jdbc.Driver");
   con  =DriverManager.getConnection("jdbc:mysql://localhost:3306/nn","root","nn");
  } catch (ClassNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
    return con; 
     
    }
 
     public static void closeConnection(Connection con){      
      if(con!=null){
       try{
       con.close();
       }catch(SQLException e){}
      }      
     }   
       public static void closePreparedStatement(PreparedStatement ps){      
      if(ps!=null){
       try{
       ps.close();
       }catch(SQLException e){}
      }
      
     }

}

LoginManagement.java

package com.login.model;

import java.sql.SQLException;
import com.login.dao.LoginDao;

public class LoginManagement 
{

 LoginDao logindao= new LoginDao();
 public boolean checkLogin(Login login) throws SQLException
 {
  return logindao.checkLogin(login);
 }

 
}

LoginController.java

package com.login.controller;

import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.login.model.Login;
import com.login.model.LoginManagement;

/**
 * Servlet implementation class LoginController
 */
@WebServlet("/LoginController")
public class LoginController extends HttpServlet {
 private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginController() {
        super();
        // TODO Auto-generated constructor stub
    }

 /**
  * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  doPost(request, response);
 }

 /**
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  
  LoginManagement loginManagement = new LoginManagement();
  RequestDispatcher rd= null;
  String action=request.getParameter("actiontype");
  if(action.equals("Login"))
  {
   
   String username=request.getParameter("username");
   String password= request.getParameter("password");
   Login login= new Login(username, password);
   boolean result=false;
   try {
     result = loginManagement.checkLogin(login);
     if(result)
     {
      request.setAttribute("user", login.getUsername());
      rd=request.getRequestDispatcher("Home.jsp");
      rd.forward(request, response);
      return;
     }
     else
     {
      request.setAttribute("err", "err");
      rd=request.getRequestDispatcher("Login.jsp");
      rd.forward(request, response);
      return;
     }
   } catch (SQLException e) {
    request.setAttribute("err", "err");
    rd=request.getRequestDispatcher("Login.jsp");  
    rd.forward(request, response);
    return;
   } 
  }
  

 }

}

Login.java

package com.login.model;

public class Login 
{

 private String username;
 private String password;
 
 public String getUsername() {
  return username;
 }
 public void setUsername(String username) {
  this.username = username;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
 public Login(String username, String password) {
  super();
  this.username = username;
  this.password = password;
 }
 
 
}

Login.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Log in</title>
<script type="text/javascript">
function validateForm()
{
 
 var x=document.getElementById("username");
 if (x.value=="")
   {
  
  document.getElementById('username_innermsg').innerHTML="Please enter the Username.";
    x.focus();
  return false;
   }
 
 document.getElementById('username_innermsg').innerHTML='';
 var x=document.getElementById("password");
 if (x.value=="")
   {
  
  document.getElementById('password_innermsg').innerHTML="Please enter the Password.";
    x.focus();
  return false;
   }
 
 document.getElementById('password_innermsg').innerHTML='';
}

</script>

</head>
<body>
<center>
<h1>Log in</h1>
<form action="LoginController" method="post" onsubmit="return validateForm();">
<input type="hidden" name="actiontype" value="Login">
<table >
<tr>
<td>User Name :</td><td><input type="text" name="username" id="username"></td><td width="200px"> <i style="color: red;" id="username_innermsg"></i></td>

</tr>
<tr>
<td>Password :</td><td><input type="password" name="password" id="password"></td><td width="200px"> <i style="color: red;" id="password_innermsg"></i></td>
</tr>
<tr><td></td><td  ><input type="submit" value="Login"><input type="reset" value="Cancel"></td><td ></td> </tr>
</table>


</form>
<i  style="color: red;">
<%
String er=null;
try{
 er= (String)request.getAttribute("err");
 if(er.equals("err"))
 {
  out.print("Incorrect Username/Password."); 
 }
}
catch (Exception e){
 
}

%>
</i>
</center>
</body>
</html>

Home.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Home</title>
</head>
<body>
<%
String user =(String)request.getAttribute("user");

%>
welcome <%if(user!=null) out.print(user); %>..
<center>
<h1>You are logged in.</h1>

</center>
</body>
</html>

Download Project: SecureLoginUsingPreparedStatement

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