线程池使用

private void multThreadDownloadPdf(List<EleInvVo> exportList, final ConcurrentLinkedQueue<String> queue,
			final CountDownLatch latch) {
		ExecutorService threadPool = Executors.newFixedThreadPool(5);
		for (final EleInvVo eleInvVo : exportList) {
			threadPool.execute(new Runnable() {
				@Override
				public void run() {
					try {
						if (!CheckUtil.isNull(eleInvVo.getPdfStorageKey())) {
							String pdfPath = WebUtil.getRelativeFilePath(
									eleInvVo.getOrderNo() + "_" + eleInvVo.getInvoiceNo() + "_" + RandomStringUtils.randomAlphanumeric(10) + ".pdf");
							jCloudService.getStorageObject(eleInvVo.getPdfStorageKey())
									.toFile(new File(pdfPath));
							queue.offer(pdfPath);
						}
					} catch (Exception e) {
						logger.error("线程下载pdf异常，订单号【{}】，异常信息：{}",eleInvVo.getOrderNo(), e);
					} finally {
						latch.countDown();
					}
				}
			});
		}
		threadPool.shutdown();
	}