重置session时间的filter

最新推荐文章于 2021-11-29 13:06:33 发布

原创最新推荐文章于 2021-11-29 13:06:33 发布 · 923 阅读

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#session #java #filter

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本文介绍了一种通过自定义过滤器实现的会话过期处理方式。该过滤器利用Redis存储用户登录令牌，并在每次请求时检查令牌的有效性及重置其过期时间，确保了在线用户的会话安全及持久性。

package com.mmall.controller.common;

import com.mmall.common.Const;
import com.mmall.pojo.User;
import com.mmall.util.CookieUtil;
import com.mmall.util.JsonUtil;
import com.mmall.util.RedisShardedPoolUtil;
import org.apache.commons.lang.StringUtils;


import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;


/**
 * Created by geely
 */
public class SessionExpireFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {


    }


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest)servletRequest;


        String loginToken = CookieUtil.readLoginToken(httpServletRequest);


        if(StringUtils.isNotEmpty(loginToken)){
            //判断logintoken是否为空或者""；
            //如果不为空的话，符合条件，继续拿user信息


            String userJsonStr = RedisShardedPoolUtil.get(loginToken);
            User user = JsonUtil.string2Obj(userJsonStr,User.class);
            if(user != null){
                //如果user不为空，则重置session的时间，即调用expire命令
                RedisShardedPoolUtil.expire(loginToken, Const.RedisCacheExtime.REDIS_SESSION_EXTIME);
            }
        }
        filterChain.doFilter(servletRequest,servletResponse);
    }




    @Override
    public void destroy() {


    }
}