AD域的Java开发操作

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.directory.Attributes;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.naming.ldap.InitialLdapContext;
import javax.naming.ldap.LdapContext;

/**
 * LDAP 连接
 */
public class LDAPConnection {

    private String baseDN;
    private String filter;
    private String[] attributes;
    private Hashtable<String, String> env = null;

    private static LDAPConnection lc;

    private LDAPConnection() {

        //搜索根节点
        baseDN = "******";
        //要查询的属性列
        attributes = new String[]{"cn"};
        //过滤条件
        if ((filter == null) || (filter == ""))
            filter = "objectclass=*";
    }

    public static LDAPConnection getInstance() {
        if (lc == null) {
            lc = new LDAPConnection();
        }
        return lc;
    }

    /**
     * 建立LDAP连接
     * @return boolean
     */
    private LdapContext getLdapContext() {
        env = new Hashtable<String, String>();
        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        env.put(Context.PROVIDER_URL, "ldap://*****:389");
        env.put(Context.SECURITY_AUTHENTICATION, "simple");
        env.put(Context.SECURITY_CREDENTIALS, "123456");
        env.put(Context.SECURITY_PRINCIPAL, "****");
        try {
            return new InitialLdapContext(env, null);
        } catch (Exception e) {
            System.out.println("连接服务器失败！");
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 获取用户信息
     * @return List<Map>
     */
    public List<Map> getUsers() {

        LdapContext ctx = getLdapContext();
        if(ctx == null){
            return null;
        }
        List<Map> list = new ArrayList<Map>();
        try {
            SearchControls constraints = new SearchControls();
            constraints.setReturningAttributes(attributes);
            constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);
            NamingEnumeration<?> en = ctx.search(baseDN, filter, constraints);

            while (en != null && en.hasMoreElements()) {
                Object obj = en.nextElement();
                if (obj instanceof SearchResult) {

                    SearchResult si = (SearchResult) obj;

                    Attributes attrs = si.getAttributes();
                    Map<String, Object> map = new HashMap<String, Object>();
                    for (int i = 0; i < attributes.length; i++) {
                        String attributeName = attributes[i];

                        if(attrs.get(attributeName) == null){
                            map.put(attributeName, attrs.get(attributeName));
                        }else{
                            map.put(attributeName, attrs.get(attributeName).get());
                        }
                    }
                    System.out.println(map);
                    list.add(map);
                } else {
                    System.out.println(obj);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println("总符合条件记录数："+list.size());
        return list;
    }

    public static void main(String arg[]) {
        LDAPConnection.getInstance().getUsers();
    }

}