Retriving user list from ldap (username - first and last, dn, cn)

Question

Hi,
I tried connecting LDAP server and succesfully connected and now i need to get userlist from LDAP can anyone give me a sample code to get userlist from LDAP.
public static boolean testLDAP() {
               InitialDirContext ctx = null;
               try {
                       Hashtable htbl = new Hashtable();
                       htbl.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
                       htbl.put(Context.PROVIDER_URL, "ldap://padl:389");
                       htbl.put(Context.URL_PKG_PREFIXES, "com.sun.jndi.url");
                       htbl.put(Context.REFERRAL, "ignore");
                       htbl.put(Context.SECURITY_AUTHENTICATION, "simple");
                       htbl.put(Context.SECURITY_PRINCIPAL, "cn=administrator");
                       htbl.put(Context.SECURITY_CREDENTIALS, "password");
                       ctx = new InitialDirContext(htbl);                       
                       if (ctx != null) {
                               ctx.close();
                               return true;
               catch (NamingException e) {
                       System.out.println("Error Connecting to LDAP Server.");
                       System.out.println(e.toString());
                       ctx=null;
                       return false;
               return false;
       }Thank You.

Answer 1

Ok here is the code to fetch userlist(First Name, Last Name, cn, dn, mail) from LDAP.
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.NameNotFoundException;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
public class UserListFromLDAP
   public static void main(String args[])
      Hashtable env = new Hashtable();
      env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
      env.put(Context.PROVIDER_URL,"ldap://host:389");
      DirContext ctx;
      try {
         ctx = new InitialDirContext(env);
      } catch (NamingException e) {
         throw new RuntimeException(e);
      NamingEnumeration results = null;
      try {
         SearchControls controls = new SearchControls();
         controls.setSearchScope(SearchControls.SUBTREE_SCOPE);
         results = ctx.search("", "(objectclass=person)", controls);
         while (results.hasMore()) {
            SearchResult searchResult = (SearchResult) results.next();           
            Attributes attributes = searchResult.getAttributes(); 
            System.out.println("dn----------> "+searchResult.getName());
            System.out.println("cn----------> "+attributes.get("cn").get());
            if (attributes.get("givenName")!=null)
                 System.out.println("First Name--> "+attributes.get("givenName").get());
            System.out.println("Last Name---> "+attributes.get("sn").get());
            System.out.println("Mail--------> "+attributes.get("mail").get()+"\n\n");
      } catch (NameNotFoundException e) {
           System.out.println("Error : "+e);
      } catch (NamingException e) {
         throw new RuntimeException(e);
      } finally {
         if (results != null) {
            try {
               results.close();
            } catch (Exception e) {
                 System.out.println("Error : "+e);
         if (ctx != null) {
            try {
               ctx.close();
            } catch (Exception e) {
                 System.out.println("Error : "+e);
}Here is the code to search user from LDAP based on cn and sn
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.NameNotFoundException;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
public class LDAPUserSearch
   public static void main(String args[])
      Hashtable env = new Hashtable();
      env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
      env.put(Context.PROVIDER_URL,"ldap://host:10389");
      DirContext ctx;
      try {
         ctx = new InitialDirContext(env);
      } catch (NamingException e) {
         throw new RuntimeException(e);
      NamingEnumeration results = null;
      // give either cn or sn to check     
      String cn = "Common Name";
      String sn = "lastName";
      try {
         SearchControls controls = new SearchControls();
         controls.setSearchScope(SearchControls.SUBTREE_SCOPE);
         if(!cn.equalsIgnoreCase("") && !sn.equalsIgnoreCase("")){
              System.out.println("Please test with either cn or sn");
         else if(cn!=null && !cn.equalsIgnoreCase("")){
              System.out.println("Result based on cn:");
              results = ctx.search("", "(cn="+cn+")", controls);
         else if(sn!=null && !sn.equalsIgnoreCase("")){
              System.out.println("Result based on sn:");
              results = ctx.search("", "(sn="+sn+")", controls);
         else{
              System.out.println("No results found");
         while (results.hasMore()) {
             SearchResult searchResult = (SearchResult) results.next();
             Attributes attributes = searchResult.getAttributes();
             System.out.println("Full Name:--------> "+attributes.get("cn").get());
             if(attributes.get("givenName")!=null)
                  System.out.println("First Name:-------> "+attributes.get("givenName").get());
             System.out.println("Last Name:--------> "+attributes.get("sn").get());
             System.out.println("Mail:-------------> "+attributes.get("mail").get());
      } catch (NullPointerException e) {
           // Leave this...
      catch (NameNotFoundException e) {
         System.out.println("Error : "+e);
      } catch (NamingException e) {
         throw new RuntimeException(e);
      } finally {
         if (results != null) {
            try {
               results.close();
            } catch (Exception e) {
                 System.out.println("Error : "+e);
         if (ctx != null) {
            try {
               ctx.close();
            } catch (Exception e) {
                 System.out.println("Error : "+e);
   public static void common() {
}