使用countdownlatch拆分任务踩坑记录

1.因有个需求， 此需求是需要单查数据才可以查询准确的数据，但是前台参数是 按月份查询，所以需要查询月区间的每天的数据
2.使用countdownlatch
3.使用 private static ExecutorService executorService = Executors.newFixedThreadPool(5);
4.举例 8.1 - 9.30号，查看区间有多少天， 分割成5份，最后一份加上余数
5.注意 Calendar calendar = Calendar.getInstance(); 这个在多线程中不可用，因为此是静态，单例
6.每个线程中查询的对象，不可通用
7.举例

	//例子
    BigDecimal sta = new BigDecimal(start.getTime());
    executorService.execute(new Runnable() {
        @Override
        public void run() {
                for(int i = 0 ;i < every;i++){

                    BigDecimal sta2 = new BigDecimal(0);
                    sta2 = sta.add(new BigDecimal(i * 24 *60 *60 *1000));
                    start.setTime(sta2.longValue());


                    bomberDistributionFroms.setDayTime(DateUtilsSync.formatYMD(start));
                    List> bomberDistributionReportForm = applicationMapper.getBomberCollectionReceiptStock(bomberDistributionFroms);
                    bomberDistributionReportFormResult.addAll(bomberDistributionReportForm);
                }
                countDownLatch.countDown();
        }
    });

	//对照
    BomberDistributionFroms finalBomberDistributionFroms = bomberDistributionFroms2;
    BigDecimal sta8 = new BigDecimal(start2.getTime());
    executorService.execute(new Runnable() {
        @Override
        public void run() {
                    BigDecimal sta2 = new BigDecimal(0);
                    sta2 = sta8.add(new BigDecimal(i * 24 *60 *60 *1000));
                    start2.setTime(sta2.longValue());

                    finalBomberDistributionFroms.setDayTime(DateUtilsSync.formatYMD(start2));
                    List> bomberDistributionReportForm = applicationMapper.getBomberCollectionReceiptStock(finalBomberDistributionFroms);
                    bomberDistributionReportFormResult.addAll(bomberDistributionReportForm);
                }
                countDownLatch.countDown();
        }
    });
    //最后 主线程等待
    try {
        countDownLatch.await();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

添加数据的list需要用 sync的list