Filter实现session超时自动跳转到login页，超过试用期不许登录

Filter

session超时&超过试用期禁用

新建一个过滤器

过滤器拦截所有请求，所以要在xml中配置拦截器作用某些url。

Filter拦截所有请求，interceptor只拦截action请求。

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;
    }
}

web.xml中加入过滤器配置

<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>

Interceptor

java代码

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 {
    }
}

spring-web.xml

     <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>