ldap验证

ldap验证的工具类，具体的一些参数注释请参照相关文档。

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingEnumeration;
import javax.naming.directory.*;
import javax.naming.ldap.InitialLdapContext;
import java.util.Hashtable;

/**
 * Ldap验证工具类，验证用户名和密码是否存在ldap服务器中。
 *
 * @author 张国明 [e-mail]
 * @version 2012-11-15 上午9:32
 */
public class LdapUtil {
    private final Log log = LogFactory.getLog(getClass());
    /**
     * 连接url
     */
    private static final String URL = "ldap://bj-dcd.zhanggmsoft.com:389";
    /**
     * 系统用户名
     */
    private static final String PRINCIPAL = "t-bysystem";
    /**
     * 系统密码
     */
    private static final String CREDENTIALS = "t-bysystem20120716";

    private static LdapUtil instance = new LdapUtil();

    private LdapUtil() {
    }

    public static LdapUtil getInstance() {
        return instance;
    }

    /**
     * 验证用户名和密码
     *
     * @param username 用户名
     * @param password 密码
     * @return 是否验证成功
     * @throws Exception
     */
    public boolean validateUser(String username, String password) throws Exception {
        InitialDirContext initialContext = (InitialDirContext) getInitialContext();
        try {
            SearchControls sc = new SearchControls();
            sc.setSearchScope(2);

            NamingEnumeration iter = initialContext.search("dc=zhanggmsoft,dc=com", "(&(samaccountname=" + username + ")(objectclass=user))", sc);
            if (iter.hasMoreElements()) {
                SearchResult result = (SearchResult) iter.nextElement();
                Attributes attributes = result.getAttributes();
                Attribute att = attributes.get("distinguishedname");
                String dn = (String) att.get();
                Hashtable<String, String> env = new Hashtable<String, String>();
                env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
                env.put(Context.SECURITY_AUTHENTICATION, "simple");
                env.put(Context.PROVIDER_URL, URL);
                env.put(Context.SECURITY_PRINCIPAL, dn);
                env.put(Context.SECURITY_CREDENTIALS, password);
                env.put(Context.REFERRAL, "follow");
                InitialDirContext initialContext1 = new InitialDirContext(env);
                try {
                    initialContext1.search(dn, null);
                } catch (Exception e) {
                    log.error(e);
                    return false;
                } finally {
                    initialContext1.close();
                }
            } else {
                return false;
            }
            return true;
        } catch (Exception e) {
            log.error(e);
            return false;
        } finally {
            initialContext.close();
        }
    }

    private InitialContext getInitialContext() throws Exception {
        Hashtable<String, String> env = new Hashtable<String, String>();
        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        env.put(Context.PROVIDER_URL, URL);
        env.put(Context.REFERRAL, "follow");
        env.put(Context.SECURITY_PRINCIPAL, PRINCIPAL);
        env.put(Context.SECURITY_CREDENTIALS, CREDENTIALS);
        return new InitialLdapContext(env, null);
    }

    public static void main(String[] args) throws Exception {
        String username = "querenjie";
        String password = "querenjie20120809";
        boolean validate = getInstance().validateUser(username, password);
        System.out.println("validate = " + validate);
    }
}