@IocBean(fields = "dao", name="userService")
@Slog(tag = "用户管理")
public class UserServiceImpl extends IdNameEntityService<User> implements RedisKey, UserService {

	@Slog(tag = "新增用户", before = "用户名[${name}]")
	public User add(String name, String password) {
		User user = new User();
		user.setName(name.trim().toLowerCase());
		user.setSalt(R.UU16());
		user.setPassword(new Sha256Hash(password, user.getSalt()).toHex());
		user.setCreateTime(new Date());
		user.setUpdateTime(new Date());
		user = dao().insert(user);
		UserProfile profile = new UserProfile();
		profile.setUserId(user.getId());
		profile.setLoginname(user.getName());
		profile.setNickname(user.getName());
		dao().insert(profile);
		return user;

上面是fileds = 'dao', 用的时候是dao() 这是什么意思？