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How to Query specific 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 specified attributes of all entries having objectclass as 'person'. The attributes such as user role and password are not grouped under default attributes. In such cases we have to explicitly specify the list of attributes to be queried.

directory.png

File Name  :  
com/bethecoder/tutorials/ldap/QuerySpecificAttributesTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
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 QuerySpecificAttributesTest {

  /**
   @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 specific attributes 
       */
      SearchControls controls = new SearchControls();
      controls.setSearchScope(SearchControls.SUBTREE_SCOPE);
      controls.setReturningAttributes(new String [] { 
          "nsRole"//Role of user
                "uid",
                "objectClass",
                "givenName",
                "sn",
                "cn"
      });

      //Get entries having objectclass=person
      String filter = "(objectclass=person)";
      results = dirContext.search("", filter, controls);

      while (results.hasMore()) {
        SearchResult searchResult = (SearchResultresults.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) {
        }
      }
    }

  }

}
   

It gives the following output,
uid: svenkata
givenName: sudhakar
objectClass: top, person, organizationalPerson, inetorgperson
sn: venkata
nsRole: cn=admin,ou=home_team,ou=people,dc=test,dc=com
cn: sudhakar venkata

uid: aradha
givenName: anu
objectClass: top, person, organizationalPerson, inetorgperson
sn: radha
nsRole: cn=super admin,ou=home_team,ou=people,dc=test,dc=com
cn: anu radha

uid: sram
givenName: sri
objectClass: top, person, organizationalPerson, inetorgperson
sn: ram
nsRole: cn=super admin,ou=home_team,ou=people,dc=test,dc=com
cn: sri ram


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