package com.autumn.filter;

import com.autumn.pojo.Users;

import javax.servlet.*;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

/**

 * 是否登录判断

 */

public class CheckLoginFilter implements Filter {

    private String USER ="";

    private String ROOTPATH;

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

        this.USER = filterConfig.getInitParameter("user").trim();

        this.ROOTPATH = filterConfig.getInitParameter("rootPath");

    }

    @Override

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {

        Object userid = null;

        HttpServletResponse res=(HttpServletResponse)response;

        HttpServletRequest req=(HttpServletRequest)request;

        Users users = (Users)req.getSession().getAttribute(USER);

        if (users!=null){

            userid =users.getId();

        }

        System.out.println("req.getRequestURI():"+req.getRequestURI());

        if(isShakedown(3018,3,16))

        {

            System.out.println("系统试用期已到，请联系商务！");

            res.sendRedirect(ROOTPATH+"?rtnCode=200");

        }else if(req.getRequestURI().contains("/loginController/login")){   //当是登录请求时,继续往下执行

            filterChain.doFilter(req, res);

        }else if(userid==null||userid.toString().trim().isEmpty())  //当没有session时,即未登录,跳到登录页

        {

            //System.out.println("CheckLoginFilter userid:"+userid);

            System.out.println("CheckLoginFilter userId is null");

            res.sendRedirect(ROOTPATH);

        }else{   //继续往下执行

            //System.out.println("CheckLoginFilter chain.doFilter");

            filterChain.doFilter(req, res);

        }

    }

    @Override

    public void destroy() {

        if(this.USER !=null&&this.USER.trim().isEmpty())

        {

            this.USER ="";

        }

        if(this.ROOTPATH!=null&&this.ROOTPATH.trim().isEmpty())

        {

            this.ROOTPATH="";

        }

    }

    //试用期判断

    public static boolean isShakedown(int year,int month,int day)

    {

        Date date = new Date();

        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar cal = Calendar.getInstance();// 获取一个Claender实例

        cal.set(year, month-1, day);

        Date endDate;

        try {

            endDate = sf.parse(sf.format(cal.getTime()));

            if (date.getTime() > endDate.getTime()) {

                return true;

            }

        } catch (ParseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

            return true;

        }

        return false;

    }

}

<filter>

    <filter-name>loginFilter</filter-name>

    <filter-class>

        com.autumn.filter.CheckLoginFilter

    </filter-class>

    <init-param>

        <param-name>excludedPages</param-name>

        <param-value>/login.jsp</param-value><!-- 登陆页不做拦截的请求声明，filter中登录的接口也被排除-->

    </init-param>

    <init-param>

        <param-name>user</param-name>   <!--配置的session参数-->

        <param-value>user</param-value>

    </init-param>

    <init-param>

        <param-name>rootPath</param-name>  <!-- 配置的登录页 -->

        <param-value>/Bookkeeping/login.jsp</param-value>

    </init-param>

</filter>

<filter-mapping>  <!--拦截映射一 -->

    <filter-name>loginFilter</filter-name>

    <url-pattern>/manager/*</url-pattern>   <!--拦截后台的请求接口-->

</filter-mapping>

<filter-mapping><!--拦截映射二 -->

    <filter-name>loginFilter</filter-name>

    <url-pattern>/jsp/*</url-pattern>    <!--拦截直接访问前端页面-->

</filter-mapping>

package com.gmtx.system.intercepts;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import com.gmtx.platform.model.Userinfo;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

public class MyInterceptor implements HandlerInterceptor {

    @Override

    public boolean preHandle(HttpServletRequest request,

                             HttpServletResponse response, Object arg2) throws Exception {

        String uri = request.getRequestURI();

        HttpSession session = request.getSession();

        Userinfo sessionUserinfo = (Userinfo)session.getAttribute("CURR_USER");

        /*不拦截静态资源spring mvc4.3以上可以用<mvc:exclude-mapping path=""/>代替*/

        if (uri.endsWith(".js")||uri.endsWith(".css")||uri.endsWith(".css")||uri.indexOf(".")>0){

            //System.out.println("不拦截资源文件"+uri);

            return true;

        }

        //System.out.println("拦截访问"+uri);

        //如果是登录页,不拦截

        if (uri.indexOf("login")>0){

            return true;

        }

        //如果已经登录,不拦截

        if(sessionUserinfo!=null){

            return true;

        }else {  //如果未登录,跳转到登陆页

            response.sendRedirect(request.getContextPath()+"/login.jsp");

            return false;

        }

    }

    @Override

    public void afterCompletion(HttpServletRequest arg0,

                                HttpServletResponse arg1, Object arg2, Exception arg3)

            throws Exception {

    }

    @Override

    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,

                           Object arg2, ModelAndView arg3) throws Exception {

    }

}

     <mvc:interceptors>

         <mvc:interceptor>

             <mvc:mapping path="/*/**"/>  <!-- /*只拦截根目录,/*/**拦截project/url -->

             <!--spring-mvc-4.3才能用以下标签

             <mvc:exclude-mapping path="/**/fonts/*"/>

             <mvc:exclude-mapping path="/**/*.css"/>

             <mvc:exclude-mapping path="/**/*.js"/>

             <mvc:exclude-mapping path="/**/*.png"/>

             <mvc:exclude-mapping path="/**/*.gif"/>

             <mvc:exclude-mapping path="/**/*.jpg"/>

             <mvc:exclude-mapping path="/**/*.jpeg"/>

             <mvc:exclude-mapping path="/**/*login*"/>

             <mvc:exclude-mapping path="/**/*Login*"/>-->

             <bean class="com.gmtx.system.intercepts.MyInterceptor"/>

         </mvc:interceptor>

     </mvc:interceptors>