浅谈spring使用策略模式实现多种场景登录方式

@Service
public class LoginService {

    @Autowired
    Set<Login> loginSet;//使用了Set 

    Map<Integer,Login> loginMap;

    public User login(User userLogin) {
        Login login=loginMap.get(userLogin.getChannelNo());
        return login.login(userLogin);
    }

    @PostConstruct
    public void init() {
        loginMap = new HashMap<>();
        for (Login login : loginSet) {
            loginMap.put(login.channel(), login);
        }

    }
}

@Component
public interface Login {
    User login(User userLogin);
    Integer channel();
}

@Component
public class PasswordLogin implements Login {
    @Autowired
    LoginDao loginDao;

    @Override
    public User login(User userLogin) {

        return loginDao.PasswordLogin(userLogin.getUsername(),userLogin.getPassword());
    }

    @Override
    public Integer channel() {
        return 2;
    }
}

@Component
public class EmailLogin implements Login {
    @Autowired
    LoginDao loginDao;

    @Override
    public User login(User userLogin) {
        return loginDao.EmailLogin(userLogin.getEmail(),userLogin.getPassword());
    }

    @Override
    public Integer channel() {
        return 3;
    }
}

@Component
public class PhoneLogin implements Login {
    @Autowired
    LoginDao loginDao;

    @Override
    public User login(User userLogin) {
        return loginDao.PhoneLogin(userLogin.getPhone(),userLogin.getPassword());
    }

    @Override
    public Integer channel() {
        return 1;
    }
}

@Mapper
@Repository
public interface LoginDao {

    @Select("select * from user where phone=#{phone} and password=#{password}")
    User PhoneLogin(String phone,String password);

    @Select("select * from user where username=#{username} and password=#{password}")
    User PasswordLogin(String username,String password);

    @Select("select * from user where email=#{email} and password=#{password}")
    User EmailLogin(String email,String password);
}