自己實現的第一個Spring mvc登錄攔截器

題目要求：拒絕未登錄用戶進入系統,只要發現用戶未登錄,則將用戶請求轉發到/login.do要求用戶登錄

實現步驟：

1.在spring的配置文件中添加登錄攔截，如下：

spring-web.xml

<mvc:interceptors>
    <!-- 配置登陸攔截器 -->
    <mvc:interceptor>
        <mvc:mapping path="/**"/>               //攔截所有請求
        <mvc:exclude-mapping path="/toLogin"/>  //不攔截與登錄相關的請求
 

        <mvc:exclude-mapping path="/login"/>
        <mvc:exclude-mapping path="/static/**"/>//不攔截靜態
        <bean class="com.hand.filter.LoginHandlerIntercepter"/>
    </mvc:interceptor>
</mvc:interceptors>

註意：要使用mvc:exclude-mapping必須將xml文件的http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"改為http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"

2.實現攔截器

LoginHandlerIntercepter.java

public class LoginHandlerIntercepter implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        if (httpServletRequest.getSession().getAttribute("customer") != null) {
            return true;
        } else {
            //沒有登陸，轉向登陸界面
            httpServletRequest.getRequestDispatcher("/toLogin").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 {

    }
}
 

小結：這個攔截器還有許多不完善的地方，但是大概思路就是這樣

Spring mvc登錄攔截器