BE THE CODER > Java > LDAP Directory Access > How to Query default attributes of LDAP Entry

LDAP (Lightweight Directory Access Protocol) is based on X.500 standard. Its a hierarchical data structure with Entries organized in a tree like structure called Directory Information Tree (DIT). The following example shows retrieving the default attributes of all entries having objectclass as 'person'.

File Name :	com/bethecoder/tutorials/ldap/QueryDefaultAttributesTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.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.Attribute;

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 QueryDefaultAttributesTest {



  /**

   * @param args

   */

  public static void main(String[] args) {



    //Setup the environment to login as anonymous user

    Hashtable<String, String> environment = new Hashtable<String, String>();

    environment.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");

    environment.put(Context.PROVIDER_URL, "ldap://localhost:389/dc=test,dc=com");



    DirContext dirContext = null;

    NamingEnumeration<?> results = null;

    

    try {

      dirContext = new InitialDirContext(environment);



      /**

       * Retrieve the default attributes 

       */

      SearchControls controls = new SearchControls();

      controls.setSearchScope(SearchControls.SUBTREE_SCOPE);

      

      //Get entries having objectclass=person

      String filter = "(objectclass=person)";

      results = dirContext.search("", filter, controls);



      while (results.hasMore()) {

        SearchResult searchResult = (SearchResult) results.next();

        Attributes attributes = searchResult.getAttributes();

        

        NamingEnumeration<? extends Attribute> attrs = attributes.getAll();



        while (attrs.hasMore()) {

          System.out.println(attrs.next());

        }

        

        System.out.println();

      }



    } catch (NameNotFoundException e) {

      e.printStackTrace();

    } catch (NamingException e) {

      e.printStackTrace();

    } finally {

      if (results != null) {

        try {

          results.close();

        } catch (Exception e) {

        }

      }



      if (dirContext != null) {

        try {

          dirContext.close();

        } catch (Exception e) {

        }

      }

    }



  }



}