HandlerInterceptor 自定义拦截器

HandlerInterceptor 自定义拦截器

org.springframework.web.servlet.HandlerInterceptor
创建自定义类

public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler) throws Exception {

        // 1.通过request对象获取session对象
        HttpSession session = request.getSession();

        // 2.从session域中获取admin对象
        Admin admin = (Admin) session.getAttribute(CrowdConstant.ATTR_NAME_LOGIN_ADMIN);

        // 3.判断Admin是否为null
        if (admin == null){
            throw new AccessForbiddenException(CrowdConstant.MESSAGE_ACCESS_FORBIDEN);
        }
        // 4.admin不为null返回true放行
        return true;
    }
}

springmvc.xml 配置