Java JNDI talk to LDAP

[problem]

You want to talk to LDAP from Java.

[/problem]

[solution]

Java as well as Perl, PHP and plain old Shell have APIs to be able to talk to LDAP.

The Java API is probably most complex one to use – I have provided some demos on how to use the others on this site.

More will be added in time.

[/solution]

[example]

Here is a full example of using Java’s JNDI to talk to LDAP, performing a search and supplying results:

import java.util.*;
import java.io.*;
import javax.naming.*;
import javax.naming.directory.*;
import javax.naming.ldap.*;

public class getLdapDetails {

public static void main(String argv[]) {

String url="ldap://127.0.0.1:389";
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,
"cn=Manager,dc=demo,dc=net");
env.put(Context.SECURITY_CREDENTIALS,"secret");

try {

DirContext ctx=new InitialDirContext(env);

String[] attrIDs = { "givenname","sn","mail" } ;
Attributes matchAttrs = new BasicAttributes(true); //ignore case
matchAttrs.put(new BasicAttribute("sn",argv[0]));
NamingEnumeration myenum =
ctx.search("dc=demo,dc=net",matchAttrs, attrIDs);

while( myenum.hasMore()) {

String PersonRecord="";

SearchResult result = (SearchResult)myenum.next();
Attributes attributes = result.getAttributes();

Attribute attr = attributes.get( "givenname" );
NamingEnumeration values = attr.getAll();

while( values.hasMore()) {
PersonRecord += values.next().toString();
PersonRecord += ", ";
}

attr = attributes.get( "sn" );
values = attr.getAll();

while( values.hasMore()) {
PersonRecord += values.next().toString();
PersonRecord += " - ";
}

attr = attributes.get( "mail" );
values = attr.getAll();

while( values.hasMore()) {
PersonRecord += values.next().toString();
}

System.out.println(PersonRecord);

}

ctx.close();

} catch(NamingException ne) { System.err.println(ne.toString()); }

}
}

Then a run through:


$ java getLdapDetails Doe
John, Doe - [email protected]

[/example]

[reference]

[tags]Java JNDI to LDAP, JNDI LDAP, LDAP Training School[/tags]

[/reference]

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