springmvc 登录拦截-蒲公英云

springmvc 登录拦截

港控/mmm° 2022-05-28 12:25 288阅读 0赞

用到拦截器： HandlerInterceptor

首先在spring-mvc.xml中配置

<!--拦截器-->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**"/> <!--表示拦截所有请求-->
            <bean class="com.car.Interceptor.LoginInterceptor"></bean> <!--拦截器类-->
        </mvc:interceptor>
    </mvc:interceptors>

创建一个拦截器类实现HandlerInterceptor接口, 目前只需要在preHandle方法中实现代码即可 ,返回true表示可通过拦截器的请求

public class LoginInterceptor implements HandlerInterceptor { 
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest,
                             HttpServletResponse httpServletResponse, Object o) throws Exception {
        //获取请求的url
        StringBuffer url = httpServletRequest.getRequestURL();
        //若是公开地址则允许通过
        if (url.toString().indexOf("login") >= 0){
            return true;
        }
        //获取session内容，若不存在身份信息则不允许访问
        UserInfo userInfo = (UserInfo) httpServletRequest.getSession().getAttribute("userInfo");
        if (userInfo != null){
            return true;
        }
        httpServletRequest.getRequestDispatcher("/admin/login")
                .forward(httpServletRequest, httpServletResponse);
        return false;
    }
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
    }
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
    }
}