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srikanthkumar
how to write a servlet and jsp program for user login form
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February 12, 2011 at 10:44 AM
Login Form using JSP and Servlet
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="../Login1" 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)Login1.java:
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Login1 extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try{
response.setContentType("text/html");
PrintWriter out=response.getWriter();
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("/examples/jsp/login.jsp");
}
}catch (Exception e) {
e.printStackTrace();
}
}
}
You can also visit Login Authentication
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