question

simple jsp code for login and validation using jsp and simple java script

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June 15, 2011 at 10:04 AM

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<script type="text/javascript">
function validate()
{
    var userName=document.valid.user.value;
    var userPass=document.valid.pass.value;
    if(userName=="")
        {
        alert("Enter User Name and Password!");
        document.form.user.focus();
        return false;
        }
    else if(userPass=="")
        {
        alert("Enter User Name and Password!");
        document.form.user.focus();
        return false;
        }
    else
        {
        document.valid.submit();
        }
    return true;
    }


</script>
<body>
<form action="Validation.jsp" method="post" name="valid" >
<table>
<tbody>
<tr>
<td>User Name:</td>
<td><input type="text" name="user"></td>
</tr>
<tr>
<td>Password:</td>
<td><input type="password" name="pass">
</td>
</tr>
<tr>
<td>
<input type="button" value="Login" onclick="validate();">
</td>
</tr>



</tbody>
</table>
</form>

<%String st=request.getParameter("msg");
if(st!=null)
out.println(st);
%>
</body>
</html>

June 15, 2011 at 10:27 AM

1)login.jsp:

    <html>
    <script>
    function validate(){
    var username=document.form.user.value;
    var password=document.form.pass.value;
    if(username==""){
     alert("Enter Username!");
      return false;
    }
    if(password==""){
     alert("Enter Password!");
      return false;
    }
    return true;
    }
    </script>
    <form name="form" method="post" action="check.jsp" onsubmit="javascript:return validate();">
    <table>
    <tr><td>Username:</td><td><input type="text" name="user"></td></tr>
    <tr><td>Password:</td><td><input type="password" name="pass"></td></tr>
    <tr><td></td><td><input type="submit" value="Submit"></td></tr>
    </table>
    </form>
    </html>

2)check.jsp:

    <%@page import="java.sql.*"%>

    <%
    try{
    String user=request.getParameter("user");
    String pass=request.getParameter("pass");
     Class.forName("com.mysql.jdbc.Driver").newInstance();
        Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");  
               Statement st=con.createStatement();
               ResultSet rs=st.executeQuery("select * from login where username='"+user+"' and password='"+pass+"'");
               int count=0;
              while(rs.next())
              {
                                  count++;
              }

                        if(count>0){
                out.println("welcome "+user);

              }
              else
              {
                           response.sendRedirect("login.jsp");
              }
    }

    catch(Exception e){
        System.out.println(e);
    }
    %>

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