登录拦截器的使用

原理：用户登录成功后会把登录信息放到session里。在web.xml里设置session过期时间。当用户在过期时间内没有操作系统，系统默认用户退出登录

    <session-config>
            <session-timeout>1</session-timeout>
    </session-config>

创建loginIntercepter 用来检测登录状态

public class loginIntercepter implements HandlerInterceptor {
    
    private final Log logger = LogFactory.getLog(loginIntercepter.class);
    @Override
    public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
            throws Exception {
        logger.debug("afterCompletion");
        System.out.println("afterCompletion");
    }
    @Override
    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
            throws Exception {
        logger.debug("postHandle");
            System.out.println("postHandle");
    }
    @Override
    public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
        logger.debug("preHandle");
        System.out.println("preHandle");
        HttpSession session=arg0.getSession();
        if(arg0.getRequestURI().indexOf("toLogin")>0){
            return true;
        }
        if(arg0.getRequestURI().indexOf("userLogin")>0){
            return true;
        }
        if(session.getAttribute("loginUser")!=null) {
            return true;
        }
        //登录超时
            arg0.getRequestDispatcher("/WEB-INF/page/museum/login.jsp").forward(arg0, arg1);
            return false;

    }
}

在 spring配置文件配置拦截器

 <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/*/*"/>
    <bean class="com.ptlogie.intercepter.loginIntercepter">
    </bean>
        </mvc:interceptor>
    </mvc:interceptors>

特别注意路径问题我的url http://localhost:8080/PTologie/loginUser/userLogin

这里的path指相对路径 /loginUser/userLogin

登录拦截器的使用

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