validation

How to validate username and password in a login screen?

View Answers

July 7, 2011 at 4:11 PM

1)login.jsp:

<html>
<head>
<script type="text/javascript">
function showData(){ 
    var user=document.getElementById("username").value;
    var pass=document.getElementById("password").value;
    xmlHttp=GetXmlHttpObject()
    var url="check.jsp";
    url=url+"?user="+user+"&&pass="+pass;
    xmlHttp.onreadystatechange=stateChanged 
    xmlHttp.open("GET",url,true)
    xmlHttp.send(null)
}
function stateChanged(){ 
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
    var showdata = xmlHttp.responseText; 
    document.getElementById("lab").innerHTML=showdata;  
    document.getElementById("lab").style.color="red";
    document.getElementById("username").value=" ";
    document.getElementById("password").value="";
    } 
}
function GetXmlHttpObject(){
var xmlHttp=null;
try{
  xmlHttp=new XMLHttpRequest();
 }
catch(e){
 try{
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch(e){
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}
</script>
</head>
<form name="form">
<table>
<tr><td>Username:</td><td><input type="text" id="username"></td></tr>
<tr><td>Password:</td><td><input type="password" id="password"></td></tr>
<tr><td></td><td><input type="button" value="Submit" onclick="showData();"></td></tr>
</table>
<label id="lab"></label>
</form>
</html>

2)check.jsp:

<%@ page import="java.sql.*" %> 
<%
String user = request.getParameter("user");
String pass = request.getParameter("pass");
String data ="";
try{
          Class.forName("com.mysql.jdbc.Driver");
          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){
            %>
            <jsp:forward page="success.jsp"/>
            <%
          }
          else{
             data="Username or Password is Invalid!";
          }
out.println(data);
System.out.println(data);
}
catch(Exception e){
System.out.println(e);
}
%>

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