.setex可覆盖 原子性
setex不可覆盖

单点登录

1.查到校验成功的用户后将用户sessionId存入cookie保存到浏览器Cookie ck = new Cookie(COOKIE_NAME,sessionId)
2.将用户session存入redis jedis.setex(sessionId,exTime，user.toString());可覆盖旧key得值
3.查用户先从cookie中获取sessionId再从redis获取用户session信息，退出则先删除cookie再删除redis
4.在过滤器中从cookie中获取sessionId重置redis中用户session信息的有效时长 jedis.expire(sessionId,exTime);

code:

package com.mmall.controller.portal;

import com.mmall.common.Const;
import com.mmall.common.ResponseCode;
import com.mmall.common.ServerResponse;
import com.mmall.pojo.User;
import com.mmall.service.IUserService;
import com.mmall.util.CookieUtil;
import com.mmall.util.JsonUtil;
import com.mmall.util.RedisShardedPoolUtil;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Created by geely
 */
@Controller
@RequestMapping("/user/")
public class UserController {


    @Autowired
    private IUserService iUserService;


    /**
     * 用户登录
     * @param username
     * @param password
     * @param session
     * @return
     */
    @RequestMapping(value = "login.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<User> login(String username, String password, HttpSession session, HttpServletResponse httpServletResponse){
        ServerResponse<User> response = iUserService.login(username,password);
        if(response.isSuccess()){

//            session.setAttribute(Const.CURRENT_USER,response.getData());
            CookieUtil.writeLoginToken(httpServletResponse,session.getId());
            RedisShardedPoolUtil.setEx(session.getId(), JsonUtil.obj2String(response.getData()),Const.RedisCacheExtime.REDIS_SESSION_EXTIME);

        }
        return response;
    }

    @RequestMapping(value = "logout.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<String> logout(HttpServletRequest httpServletRequest,HttpServletResponse httpServletResponse){
        String loginToken = CookieUtil.readLoginToken(httpServletRequest);
        CookieUtil.delLoginToken(httpServletRequest,httpServletResponse);
        RedisShardedPoolUtil.del(loginToken);

//        session.removeAttribute(Const.CURRENT_USER);

        return ServerResponse.createBySuccess();
    }

    @RequestMapping(value = "register.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<String> register(User user){
        return iUserService.register(user);
    }


    @RequestMapping(value = "check_valid.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<String> checkValid(String str,String type){
        return iUserService.checkValid(str,type);
    }


    @RequestMapping(value = "get_user_info.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<User> getUserInfo(HttpServletRequest httpServletRequest){

        String loginToken = CookieUtil.readLoginToken(httpServletRequest);
        if(StringUtils.isEmpty(loginToken)){
            return ServerResponse.createByErrorMessage("用户未登录,无法获取当前用户的信息");
        }
        String userJsonStr = RedisShardedPoolUtil.get(loginToken);
        User user = JsonUtil.string2Obj(userJsonStr,User.class);

        if(user != null){
            return ServerResponse.createBySuccess(user);
        }
        return ServerResponse.createByErrorMessage("用户未登录,无法获取当前用户的信息");
    }


    @RequestMapping(value = "forget_get_question.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<String> forgetGetQuestion(String username){
        return iUserService.selectQuestion(username);
    }


    @RequestMapping(value = "forget_check_answer.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<String> forgetCheckAnswer(String username,String question,String answer){
        return iUserService.checkAnswer(username,question,answer);
    }


    @RequestMapping(value = "forget_reset_password.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<String> forgetRestPassword(String username,String passwordNew,String forgetToken){
        return iUserService.forgetResetPassword(username,passwordNew,forgetToken);
    }



    @RequestMapping(value = "reset_password.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<String> resetPassword(HttpServletRequest httpServletRequest,String passwordOld,String passwordNew){
//        User user = (User)session.getAttribute(Const.CURRENT_USER);
        String loginToken = CookieUtil.readLoginToken(httpServletRequest);
        if(StringUtils.isEmpty(loginToken)){
            return ServerResponse.createByErrorMessage("用户未登录,无法获取当前用户的信息");
        }
        String userJsonStr = RedisShardedPoolUtil.get(loginToken);
        User user = JsonUtil.string2Obj(userJsonStr,User.class);

        if(user == null){
            return ServerResponse.createByErrorMessage("用户未登录");
        }
        return iUserService.resetPassword(passwordOld,passwordNew,user);
    }


    @RequestMapping(value = "update_information.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<User> update_information(HttpServletRequest httpServletRequest,User user){
        String loginToken = CookieUtil.readLoginToken(httpServletRequest);
        if(StringUtils.isEmpty(loginToken)){
            return ServerResponse.createByErrorMessage("用户未登录,无法获取当前用户的信息");
        }
        String userJsonStr = RedisShardedPoolUtil.get(loginToken);
        User currentUser = JsonUtil.string2Obj(userJsonStr,User.class);

        if(currentUser == null){
            return ServerResponse.createByErrorMessage("用户未登录");
        }
        user.setId(currentUser.getId());
        user.setUsername(currentUser.getUsername());
        ServerResponse<User> response = iUserService.updateInformation(user);
        if(response.isSuccess()){
            response.getData().setUsername(currentUser.getUsername());
            RedisShardedPoolUtil.setEx(loginToken, JsonUtil.obj2String(response.getData()),Const.RedisCacheExtime.REDIS_SESSION_EXTIME);
        }
        return response;
    }

    @RequestMapping(value = "get_information.do",method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse<User> get_information(HttpServletRequest httpServletRequest){
        String loginToken = CookieUtil.readLoginToken(httpServletRequest);
        if(StringUtils.isEmpty(loginToken)){
            return ServerResponse.createByErrorMessage("用户未登录,无法获取当前用户的信息");
        }
        String userJsonStr = RedisShardedPoolUtil.get(loginToken);
        User currentUser = JsonUtil.string2Obj(userJsonStr,User.class);

        if(currentUser == null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),"未登录,需要强制登录status=10");
        }
        return iUserService.getInformation(currentUser.getId());
    }
}

===============================================================

分布式锁

jedis.setnx（key,value）不可覆盖
设置成功，返回 1 。 设置失败，返回 0 。
先jedis.setnx（Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,System.currentTimeMillis()+lockTimeout）设置锁，如果返回1成功获取到锁，则调用业务代码，在业务代码开头使用jedis.expire(key,exTime);防止死锁，业务代码结束后使用jedis.del(key)删除锁；如果没有获取到锁，通过当前时间与System.currentTimeMillis()+lockTimeout比较大小
redission RLock 可重入锁 rlock.tryLock(0,50, TimeUnit.SECONDS)
RLock lock = redissonManager.getRedisson().getLock(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
boolean getLock = false;
if(getLock = lock.tryLock(0,50, TimeUnit.SECONDS)){
log.info("Redisson获取到分布式锁:{},ThreadName:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,Thread.currentThread().getName());
int hour = Integer.parseInt(PropertiesUtil.getProperty("close.order.task.time.hour","2"));
// iOrderService.closeOrder(hour);
}else{
log.info("Redisson没有获取到分布式锁:{},ThreadName:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,Thread.currentThread().getName());
}

code:

package com.mmall.task;

import com.mmall.common.Const;
import com.mmall.common.RedissonManager;
import com.mmall.service.IOrderService;
import com.mmall.util.PropertiesUtil;
import com.mmall.util.RedisShardedPoolUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.redisson.api.RLock;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import javax.annotation.PreDestroy;
import java.util.concurrent.TimeUnit;

/**
 * Created by geely
 */
@Component
@Slf4j
public class CloseOrderTask {

    @Autowired
    private IOrderService iOrderService;

    @Autowired
    private RedissonManager redissonManager;

    @PreDestroy
    public void delLock(){
        RedisShardedPoolUtil.del(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);

    }

//    @Scheduled(cron="0 */1 * * * ?")//每1分钟(每个1分钟的整数倍)
    public void closeOrderTaskV1(){
        log.info("关闭订单定时任务启动");
        int hour = Integer.parseInt(PropertiesUtil.getProperty("close.order.task.time.hour","2"));
//        iOrderService.closeOrder(hour);
        log.info("关闭订单定时任务结束");
    }

//    @Scheduled(cron="0 */1 * * * ?")
    public void closeOrderTaskV2(){
        log.info("关闭订单定时任务启动");
        long lockTimeout = Long.parseLong(PropertiesUtil.getProperty("lock.timeout","5000"));

        Long setnxResult = RedisShardedPoolUtil.setnx(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,String.valueOf(System.currentTimeMillis()+lockTimeout));
        if(setnxResult != null && setnxResult.intValue() == 1){
            //如果返回值是1，代表设置成功，获取锁
            closeOrder(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
        }else{
            log.info("没有获得分布式锁:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
        }
        log.info("关闭订单定时任务结束");
    }

    @Scheduled(cron="0 */1 * * * ?")
    public void closeOrderTaskV3(){
        log.info("关闭订单定时任务启动");
        long lockTimeout = Long.parseLong(PropertiesUtil.getProperty("lock.timeout","5000"));
        Long setnxResult = RedisShardedPoolUtil.setnx(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,String.valueOf(System.currentTimeMillis()+lockTimeout));
        if(setnxResult != null && setnxResult.intValue() == 1){
            closeOrder(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
        }else{
            //未获取到锁，继续判断，判断时间戳，看是否可以重置并获取到锁
            String lockValueStr = RedisShardedPoolUtil.get(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
            if(lockValueStr != null && System.currentTimeMillis() > Long.parseLong(lockValueStr)){
                String getSetResult = RedisShardedPoolUtil.getSet(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,String.valueOf(System.currentTimeMillis()+lockTimeout));
                //再次用当前时间戳getset。
                //返回给定的key的旧值，->旧值判断，是否可以获取锁
                //当key没有旧值时，即key不存在时，返回nil ->获取锁
                //这里我们set了一个新的value值，获取旧的值。
                if(getSetResult == null || (getSetResult != null && StringUtils.equals(lockValueStr,getSetResult))){
                    //真正获取到锁
                    closeOrder(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
                }else{
                    log.info("没有获取到分布式锁:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
                }
            }else{
                log.info("没有获取到分布式锁:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
            }
        }
        log.info("关闭订单定时任务结束");
    }

//    @Scheduled(cron="0 */1 * * * ?")
    public void closeOrderTaskV4(){
        RLock lock = redissonManager.getRedisson().getLock(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
        boolean getLock = false;
        try {
            if(getLock = lock.tryLock(0,50, TimeUnit.SECONDS)){
                log.info("Redisson获取到分布式锁:{},ThreadName:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,Thread.currentThread().getName());
                int hour = Integer.parseInt(PropertiesUtil.getProperty("close.order.task.time.hour","2"));
//                iOrderService.closeOrder(hour);
            }else{
                log.info("Redisson没有获取到分布式锁:{},ThreadName:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,Thread.currentThread().getName());
            }
        } catch (InterruptedException e) {
            log.error("Redisson分布式锁获取异常",e);
        } finally {
            if(!getLock){
                return;
            }
            lock.unlock();
            log.info("Redisson分布式锁释放锁");
        }
    }




    private void closeOrder(String lockName){
        RedisShardedPoolUtil.expire(lockName,5);//有效期50秒，防止死锁
        log.info("获取{},ThreadName:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,Thread.currentThread().getName());
        int hour = Integer.parseInt(PropertiesUtil.getProperty("close.order.task.time.hour","2"));
        iOrderService.closeOrder(hour);
        RedisShardedPoolUtil.del(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
        log.info("释放{},ThreadName:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,Thread.currentThread().getName());
        log.info("===============================");
    }




}