Java 使用线程池分批插入或者更新数据

public void batchDeal(List data ,Integer batchNum)  {
			int totalNum = data.size();
			int pageNum = totalNum % batchNum == 0 ? totalNum / batchNum : totalNum / batchNum + 1;
			ExecutorService executor = Executors.newFixedThreadPool(pageNum);

			try {
				CountDownLatch countDownLatch = new CountDownLatch(pageNum);
				List subData = null;
				int fromIndex, toIndex;
				for (int i = 0; i < pageNum; i++) {
					fromIndex = i * batchNum;
					toIndex = Math.min(totalNum, fromIndex + batchNum);
					subData = data.subList(fromIndex, toIndex);
					ImportTask task = new ImportTask(subData, countDownLatch);
					executor.execute(task);
				}
			   // 主线程必须在启动其它线程后立即调用CountDownLatch.await()方法，
               // 这样主线程的操作就会在这个方法上阻塞，直到其它线程完成各自的任务。
               // 计数器的值等于0时，主线程就能通过await()方法恢复执行自己的任务。
				countDownLatch.await();
			} catch (Exception e) {
				throw new AppException(e, "异常信息！");
			} finally {
				// 关闭线程池，释放资源
				executor.shutdown();
			}
	}


class ImportTask implements Runnable {
		private List list;
		private CountDownLatch countDownLatch;

		public ImportTask(List data, CountDownLatch countDownLatch) {
			this.list = data;
			this.countDownLatch = countDownLatch;
		}

		@Override
		public void run() {
			if (null != list) {
			   // 业务逻辑，例如批量insert或者update
			   logger.info("现在操作的数据是{}", list);
			}
			// 发出线程任务完成的信号
			countDownLatch.countDown();
		}
	}