//连接代码
Hashtable env = new Hashtable(11);
    env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
    env.put(Context.PROVIDER_URL, "ldap://localhost:389");

    env.put(Context.SECURITY_AUTHENTICATION, "simple");
    env.put(Context.SECURITY_PRINCIPAL, "cn=Manager,o=JNDITutorial");
    env.put(Context.SECURITY_CREDENTIALS, "secret");

    String searchBase= "o=JNDITutorial";//从默认的点开始寻找,这里的根是 dc-dc 
    String searchContents="(ou=*)";

try ...{
       /**//* get a handle to an Initial DirContext */
       DirContext ctx = new InitialDirContext(env);

       /**//* specify search constraints to search subtree */
       SearchControls constraints = new SearchControls();
       constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);

       /**//* search for all entries with surname of Jensen */
       NamingEnumeration results
           = ctx.search(searchBase, searchContents, constraints);


       /**//* for each entry print out name + all attrs and values */
       while (results != null && results.hasMore()) ...{

           SearchResult si = (SearchResult)results.next();

           /**//* print its name */
           System.out.println("name: " + si.getName());

           Attributes attrs = si.getAttributes();
           if (attrs == null) ...{
               System.out.println("No attributes");
           } else ...{
               /**//* print each attribute */
               for (NamingEnumeration ae = attrs.getAll();
                    ae.hasMoreElements();) ...{
                   Attribute attr = (Attribute)ae.next();
                   String attrId = attr.getID();

                   /**//* print each value */
                   for (Enumeration vals = attr.getAll();
                        vals.hasMoreElements();
                        System.out.println(attrId + ": " + vals.nextElement()))
                           ;
               }
           }
           System.out.println();
       }
   } catch (NamingException e) ...{
       System.err.println("Search example failed.");
       e.printStackTrace();
   }