Search LDAP User using Java

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

import java.util.Hashtable; import javax.naming.Context; import javax.naming.directory.SearchControls; import javax.naming.directory.SearchResult; import javax.naming.NamingEnumeration; import javax.naming.NamingException; import javax.naming.ldap.InitialLdapContext; import javax.naming.ldap.LdapContext; class LdapUserChecker { public static void main(String[] args) { boolean result = false; String ldapDomain = args[0]; String ldapHost = args[1]; String ldapSearchbase = args[2]; String ldapLookupUserID = args[3]; String ldapLookupUserPwd = args[4]; String userID = args[5]; 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, ldapLookupUserID + "@" + ldapDomain); env.put(Context.SECURITY_CREDENTIALS, ldapLookupUserPwd); LdapContext context = null; NamingEnumeration results = null; try { context = new InitialLdapContext(env, null); SearchControls controls = new SearchControls(); controls.setSearchScope(SearchControls.SUBTREE_SCOPE); results = context.search("", "(sAMAccountName="+userID+")", controls); if (results.hasMore()) { result = true; } } catch (NamingException e) { System.out.println("LDAP authenication failed for lookup user: " + ldapLookupUserID); System.out.println(e.getMessage()); } finally { if (results != null) { try { results.close(); } catch (Exception e) { } } if (context != null) { try { context.close(); } catch (NamingException e) { throw new RuntimeException(e); } } } if (result) { System.out.println("User '" + userID + "' exists!"); } else { System.out.println("User '" + userID + "' does not exist!"); } } }