Java - LDAP实现AD域单点登录

import org.springframework.stereotype.Service;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import java.util.Hashtable;

@Service
public class UserLoginServicelmpl implements UserLoginService {

    @Override
    public String ldapLogin(String username, String password) {

        DirContext ctx = null;
        //通过ldap登录
        Hashtable ldap = new Hashtable();
        ldap.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        //ad域地址：windos server上输入ipconfig查看，369是固定端口，dc=yiduanhen,dc=com是域的范围
        ldap.put(Context.PROVIDER_URL, "ldap://192.168.1.102:389/dc=yiduanhen,dc=com");
        //ad域登录用户
        ldap.put(Context.SECURITY_PRINCIPAL, username);
        //ad域登录密码
        ldap.put(Context.SECURITY_CREDENTIALS, password);

        try {
            //登录验证
            ctx = new InitialDirContext(ldap);
            ctx.close();
        } catch (NamingException e) {
           e.printStackTrace();
        }
        return "登录成功";
    }
}

        int row = 0;
        //LDAP搜索过滤器类
        String searchFilter = "objectClass=User";
        //搜索控制器
        SearchControls searchCtls = new SearchControls();
        //创建搜索控制器
        searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);
        //定制返回属性sn=姓，givenName=名
        String returnedAtts[] = {"sn", "givenName"};
        //设置返回属性集
        searchCtls.setReturningAttributes(returnedAtts);
        //域节点组织OU="组织名称"("OU="",DC="",DC="",DC="",DC="";)
        String searchBase = "OU=p";
        //根据设置的域节点、过滤器类和搜索控制器搜索LDAP得到结果
        NamingEnumeration answer = ctx.search(searchBase, searchFilter,
                searchCtls);
        //遍历结果
        while (answer.hasMoreElements()) {
            //得到符合搜索条件的DN
            SearchResult sr = (SearchResult) answer.next();
            String dn = sr.getName();
            //返回
            String match = dn.split("CN=")[1].split(",")[0];
            if (usnerName.equals(match)) {
                //得到符合条件的属性集
                BasicAttributes Attrs = (BasicAttributes) sr.getAttributes();
                if (Attrs != null) {
                    try {
                        Iterator ite = Attrs.getIDs().asIterator();
                        for (NamingEnumeration ne = Attrs.getAll(); ne.hasMore(); ) {
                            Attribute Attr = (Attribute) ne.next();
                            //取值
                            for (NamingEnumeration e = Attr.getAll(); e.hasMore(); row++) {
                                String keyId = (String) ite.next();
                                switch (keyId) {
                                    case "sn":
                                        return e.next().toString();
                                    case "givenName":
                                        return e.next().toString();
                                }
                            }
                        }
                        ctx.close();
                    } catch (NamingException e) {
                        e.printStackTrace();
                    }
                }
            }
        }