public class chLdapDetails {

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);
ModificationItem[] mods = new ModificationItem[1];
mods[0] = new ModificationItem(DirContext.REPLACE_ATTRIBUTE,
new BasicAttribute("givenname","John A"));
ctx.modifyAttributes("cn=jdoe,dc=demo,dc=net", mods);
ctx.close();

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

}
}

$ java chLdapDetails
$ java getLdapDetails Doe
John A, Doe - john.doe@demo.net

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()); }

}
}