active|标准在ActiveDirectory中 支持 LDAP 协议，我们可以在 Java 中使用标准的 Java JNDI API 来访问它。LDAP 服务器并非真的必须支持 JNDI API，只要支持 LDAP 协议就可以了。我们已经提供了一个简单的测试案例程序来认证一个 LDAP 服务器的识别名。一般情况下，对待 ActiveDirectory 不必与对待任何其他的 LDAP 服务器有什么不同。

import java.util.Properties;import javax.naming.*;   import javax.naming.directory.*;//include the JNDI in the classpath. You should use the same JDK used by WebSphere Application server.class wasLdapAuth {public static void main(String[] args) {    //***************** user information to be authenticated ********************************    //*****************Please modify the following three properties accordingly ************    String ldapHost= "ldap://cliang1.austin.ibm.com:389"; //ldap host + port number    String DN = "cn=user1, ou=Austin,o=ibm,c=us";   // DN to be authenticated     String password = "security";  //  DN's password         //***************** End of user information        Properties props = new Properties();      props.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");     //for websphere 4.0 and 5.0    //props.put(Context.INITIAL_CONTEXT_FACTORY, "com.ibm.jndi.LDAPCtxFactory");      // for WebSphere 3.5 release     props.put(Context.SECURITY_AUTHENTICATION, "simple");     //use simple authentication mechanism    props.put(Context.SECURITY_CREDENTIALS, password);      props.put(Context.SECURITY_PRINCIPAL, DN);         props.put(Context.PROVIDER_URL, ldapHost);      long start = System.currentTimeMillis();    long end=0;    long time =0;    try         {        System.out.println("authenticating");          DirContext ctx = new InitialDirContext(props);        System.out.println("authenticated");         end = System.currentTimeMillis();        time = end - start;        System.out.println( "authentication takes = " + time + " millis");             System.out.println("successfully authenticate DN: "+DN);    }         catch (Exception ex)    {        end = System.currentTimeMillis();        time = end - start;        System.out.println("Exception is "+ex.toString());         ex.printStackTrace();        System.out.println( "authentication takes = " + time + " millis");            System.out.println("fail to authenticate DN: "+DN);    }}}