redis中分頁緩存數據

`

@Autowired
StringRedisTemplate stringRedisTemplate;

@ApiOperation(value = "查詢操作日志" )
@GetMapping("/querySysLogList")
public R querySysLogList(
        @ApiParam(name = "startTime", value = "操作時間", required = false) @RequestParam(value = "startTime", required = false) String startTime,
        @ApiParam(name = "userName", value = "操作人", required = false) @RequestParam(value = "userName", required = false) String userName,
        @ApiParam(name = "operate", value = "操作(添加 修改  刪除)", required = false) @RequestParam(value = "operate", required = false) String operate,
        @ApiParam(name = "module", value = "操作模塊", required = false) @RequestParam(value = "module", required = false) String module,
        @ApiParam(name = "page", value = "分頁參數", required = false, defaultValue = "1") @RequestParam(value = "page", required = false, defaultValue = "1") Integer page,
        @ApiParam(name = "pageSize", value = "每頁大小", required = false, defaultValue = "10") @RequestParam(value = "pageSize", required = false, defaultValue = "10") Integer pageSize)
{

    JSONObject jsonObject=new JSONObject();
    //此處代碼用的是mybatisplus的構造器,有興趣的自行了解
    Page<SysLog> defendPage = new Page<>();
    EntityWrapper<SysLog> entityWrapper = new EntityWrapper<>();
    List<SysLog> dataList = new ArrayList<>();
    if(StringUtils.isEmpty(startTime) && StringUtils.isEmpty(userName) && StringUtils.isEmpty(operate)
            && StringUtils.isEmpty(module) && pageSize==10){
        Object o = stringRedisTemplate.opsForHash().entries(RedisConstants.USER_CACHE_LOG).get(page.toString());
        //.entries 獲取變量中的鍵值對 .get獲取變量中指定的map鍵 存在該map鍵獲取值 沒有返回null
        Object total = stringRedisTemplate.opsForHash().entries(RedisConstants.USER_CACHE_LOG).get("total");
        log.info("從緩存中獲取用戶操作日志信息===========>>>"+o);
        if(!StringUtils.isEmpty(o) && !StringUtils.isEmpty(total)){
            List list = JsonUtils.fromJson(o.toString(),List.class);
            Iterator iterator = list.iterator();
            //迭代遍歷
            while (iterator.hasNext()){
                SysLog sysLog = JsonUtils.fromJson(iterator.next().toString(),SysLog.class);
                dataList.add(sysLog);
            }
            defendPage.setTotal(JsonUtils.fromJson(total.toString(),Integer.class));
            jsonObject.put("dataList",dataList);
            jsonObject.put("totalCount",defendPage.getTotal());
            return new R().data(jsonObject);
        }else{
            defendPage.setCurrent(page);
            defendPage.setSize(pageSize);
            entityWrapper.orderBy("operate_time",false);
            defendPage = sysLogService.selectPage(defendPage,entityWrapper);
            dataList = defendPage.getRecords();
            if (StringUtil.isNotNull(dataList)) {
                stringRedisTemplate.boundHashOps(RedisConstants.USER_CACHE_LOG).put(page.toString(), JsonUtils.toJson(dataList));
                stringRedisTemplate.boundHashOps(RedisConstants.USER_CACHE_LOG).put("total", JsonUtils.toJson(defendPage.getTotal()));
                stringRedisTemplate.expire(RedisConstants.USER_CACHE_LOG, 30L, TimeUnit.DAYS);
            }

              // 第二種分頁緩存方法 兩種結果一樣
            stringRedisTemplate.opsForHash().put(RedisConstants.USER_CACHE_LOG, page.toString(), JsonUtils.toJson(dataList));
            stringRedisTemplate.expire(RedisConstants.USER_CACHE_LOG, 30L, TimeUnit.DAYS);

            defendPage.setTotal(defendPage.getTotal());
            jsonObject.put("dataList",dataList);
            jsonObject.put("totalCount",defendPage.getTotal());
            return new R().data(jsonObject);
        }
    }else{
        if(!StringUtils.isEmpty(startTime)){
        Date time= DateUtil.parseDate(startTime);
        Date startTime1=DateUtil.beginOfDay(time);
        Date endTime1=DateUtil.endOfDay(time);
        entityWrapper.between("operate_time",startTime1,endTime1);
    }
    if(!StringUtils.isEmpty(userName)){
        entityWrapper.like("user_name",userName);
    }
    if(!StringUtils.isEmpty(operate)){
        entityWrapper.like("operate",operate);
    }
    if(!StringUtils.isEmpty(module)){
        entityWrapper.like("module",module);
    }
    entityWrapper.orderBy("operate_time",false);
    Page<SysLog> list=sysLogService.selectPage(defendPage,entityWrapper);
    jsonObject.put("dataList",list.getRecords());
    jsonObject.put("totalCount",list.getTotal());
    return new R().data(jsonObject);
    }
}

`