In Java applications it is often needed to fetch the LDAP entries. In this chapter we are discussing the way by which a Java application is displaying user entries in LDAP using JNDI . In previous chapters we have seen how to add a user to LDAP using Apache Directory Studio.Also we have seen how to add a user from Java application.So we have few user entries in our directory. The Java code shown below fetches the user entries from LDAP and displays them in console.
Displaying user entries in LDAP using JNDI
ListEntries.java
import java.util.Properties;
import javax.naming.Context;
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 ListEntries {
public ListEntries() {
}
public void getEntries() {
Properties initilaProperties = new Properties();
initilaProperties.put(Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.ldap.LdapCtxFactory");
initilaProperties.put(Context.PROVIDER_URL, "ldap://localhost:10389");
initilaProperties
.put(Context.SECURITY_PRINCIPAL, "uid=admin,ou=system");
initilaProperties.put(Context.SECURITY_CREDENTIALS, "secret");
try {
DirContext context = new InitialDirContext(initilaProperties);
String searchFilter = "(objectClass=inetOrgPerson)";
String[] requiredAttributes = { "employeeNumber", "cn",
"telephoneNumber" };
SearchControls controls = new SearchControls();
controls.setSearchScope(SearchControls.SUBTREE_SCOPE);
controls.setReturningAttributes(requiredAttributes);
NamingEnumeration users = context.search("ou=users,ou=system",
searchFilter, controls);
SearchResult searchResult = null;
String commonName = null;
String empNumber = null;
String telephoneNumber = null;
while (users.hasMore()) {
searchResult = (SearchResult) users.next();
Attributes attr = searchResult.getAttributes();
commonName = attr.get("cn").get(0).toString();
empNumber = attr.get("employeeNumber").get(0).toString();
telephoneNumber = attr.get("telephoneNumber").get(0).toString();
System.out.println("Name = " + commonName);
System.out.println("Employee Number = " + empNumber);
System.out.println("Phone Number = " + telephoneNumber);
}
} catch (NamingException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
ListEntries sample = new ListEntries();
sample.getEntries();
}
}
The application fetches users from ‘ou=users,ou=system’.Now let us see the output.
Output
Name = Bijoy
Employee Number = 112233
Phone Number = 99999999999
Name = Karthik
Employee Number = 333333
Phone Number = 777777777
See also:
Naming service example using JBossNS service provider
Updating attribute of LDAP entry using JNDI
Deleting attribute of an LDAP entry