【问题记录】mvc配置拦截器xml生效而配置类不生效

问题是使用xml配置生效，但是代码配置失效，找了很久，基本上没看到这个问题，有也没有解决方案，唉。

先记录一下xml的方式，后续再查查。

1.创建登录拦截器

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestURI = request.getRequestURI();
        System.out.println("requestURI: " + requestURI);
        //检测此时的登录状态  session
        HttpSession session = request.getSession();
        Object client = session.getAttribute("client");//获取登录状态 如果没有登录
        if (client == null) {
            response.setStatus(401);
            return false;
        }
        //如果存在
        BaseContext.setCurrentClient((Client) client);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        BaseContext.removeClient();
    }
}

2.在xml中注册

网上好多让去掉<mvc:annotation-driven>的，这个可万万不能去掉啊。

    <!--开启springmvc-->
    <mvc:annotation-driven/>
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**" />
            <mvc:exclude-mapping path="/client/login"/>
            <mvc:exclude-mapping path="/client/register"/>
            <bean class="com.qcby.config.LoginInterceptor"></bean>
        </mvc:interceptor>
    </mvc:interceptors>