LDAP Authentication using Java

This example shows how to authenticate a LDAP user using Java.

import java.util.Hashtable; import javax.naming.Context; import javax.naming.NamingException; import javax.naming.ldap.InitialLdapContext; import javax.naming.ldap.LdapContext; class LdapAuthenticator { public static void main(String[] args) { String ldapDomain = args[0]; String ldapHost = args[1]; String ldapSearchbase = args[2]; String userName = args[3]; String password = args[4]; String url = ldapHost.endsWith("/") ? ldapHost + ldapSearchbase : ldapHost + "/" + ldapSearchbase; Hashtable env = new Hashtable(); env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory"); env.put(Context.PROVIDER_URL, url); env.put(Context.SECURITY_AUTHENTICATION, "simple"); env.put(Context.SECURITY_PRINCIPAL, userName + "@" + ldapDomain); env.put(Context.SECURITY_CREDENTIALS, password); LdapContext context = null; try { context = new InitialLdapContext(env, null); System.out.println("LDAP authenication succeed for user: " + userName); } catch (NamingException e) { System.out.println("LDAP authenication failed for user: " + userName); System.out.println(e.getMessage()); } finally { if(context != null) { try { context.close(); } catch (NamingException e) { throw new RuntimeException(e); } } } } }