Simple LDAP Authentication

This is a simple example through which we will connect to the LDAP Server and authenticate user.
I have used ApacheDS Server as a LDAP Server. Install ApacheDS server and run it.

Following is a servlet used. make login.html and use as it Login.java

package ajaxdemo.action;

import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.naming.*;
import javax.naming.directory.*;
import java.util.Hashtable;

public class Login extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {

 public Login() {
  super();
 }

 protected void processRequest(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  final String SUCCESS = "Success.html";
  final String FAILURE = "Failure.html";
  String strUrl = "login.html";
  String username = request.getParameter("username");
  String password = request.getParameter("password");

  Hashtable env = new Hashtable(11);

  boolean b = false;

  env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
  env.put(Context.PROVIDER_URL, "ldap://localhost:10389");
  env.put(Context.SECURITY_AUTHENTICATION, "simple");
  env.put(Context.SECURITY_PRINCIPAL, "uid=" + username + ",ou=system");
  env.put(Context.SECURITY_CREDENTIALS, password);

  try {
   // Create initial context
   DirContext ctx = new InitialDirContext(env);

   // Close the context when we're done
   b = true;
   ctx.close();

  } catch (NamingException e) {
   b = false;
  } finally {
   if (b) {
    System.out.print("Success");
    strUrl = SUCCESS;
   } else {
    System.out.print("Failure");
    strUrl = FAILURE;
   }
  }
  RequestDispatcher rd = request.getRequestDispatcher(strUrl);
  rd.forward(request, response);

 }

 protected void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  processRequest(request, response);
 }

 protected void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  processRequest(request, response);
 }
}

Enjoy LDAP!! :)