/**
 * 拆分集合
 *
 * @param <T> 泛型對象
 * @param resList 需要拆分的集合
 * @param subListLength 每個(gè)子集合的元素個(gè)數(shù)
 * @return 返回拆分后的各個(gè)集合組成的列表
 **/
public static <T> List<List<T>> splitList(List<T> resList, int subListLength) {
    if (CollectionUtils.isEmpty(resList) || subListLength <= 0) {
        return new ArrayList<>();
    }
    List<List<T>> ret = new ArrayList<>();
    int size = resList.size();
    if (size <= subListLength) {
        // 數(shù)據(jù)量不足 subListLength 指定的大小
        ret.add(resList);
    } else {
        int pre = size / subListLength;
        int last = size % subListLength;
        // 前面pre個(gè)集合，每個(gè)大小都是 subListLength 個(gè)元素
        for (int i = 0; i < pre; i++) {
            List<T> itemList = new ArrayList<>(subListLength);
            for (int j = 0; j < subListLength; j++) {
                itemList.add(resList.get(i * subListLength + j));
            }
            ret.add(itemList);
        }

        // last的進(jìn)行處理
        if (last > 0) {
            List<T> itemList = new ArrayList<>(last);
            for (int i = 0; i < last; i++) {
                itemList.add(resList.get(pre * subListLength + i));
            }
            ret.add(itemList);
        }
    }
    return ret;
}

 public static void doThreadBusiness(List<String> totalList) {
        Long startTime = System.currentTimeMillis();
        System.out.println("本次更新任務(wù)開始");
        System.out.println("本機(jī)CPU核心數(shù)："+Runtime.getRuntime().availableProcessors());
        List<String> updateList = new ArrayList();
        // 初始化線程池, 參數(shù)一定要一定要一定要調(diào)好?。。?！
        ThreadPoolExecutor threadPool = new ThreadPoolExecutor(10, 50,
                4, TimeUnit.SECONDS, new ArrayBlockingQueue(10), new ThreadPoolExecutor.DiscardPolicy());
        // 大集合拆分成N個(gè)小集合，然后用多線程去處理數(shù)據(jù)，確保不會(huì)因?yàn)閿?shù)據(jù)量過大導(dǎo)致執(zhí)行過慢
        List<List<String>> splitNList = SplitListUtils.splitList(totalList, 5000);
        // 記錄單個(gè)任務(wù)的執(zhí)行次數(shù)
        CountDownLatch countDownLatch = new CountDownLatch(splitNList.size());
        // 對拆分的集合進(jìn)行批量處理, 先拆分的集合, 再多線程執(zhí)行
        for (List<String> singleList : splitNList) {
            // 線程池執(zhí)行
            threadPool.execute(new Thread(new Runnable(){
                @Override
                public void run() {
                    //模擬執(zhí)行時(shí)間
                    System.out.println("當(dāng)前線程："+Thread.currentThread().getName());
                    List<String> batchUpdateVipList = new ArrayList<>();
                    for (String str : singleList) {
                        //組裝要執(zhí)行的批量更新數(shù)據(jù)
                        batchUpdateVipList.add(str);
                    }
                    // 這里模擬執(zhí)行數(shù)據(jù)庫批量更新操作
                    System.out.println("本次批量更新數(shù)據(jù)量："+ batchUpdateVipList.size());
                    // 任務(wù)個(gè)數(shù) - 1, 直至為0時(shí)喚醒a(bǔ)wait()
                    countDownLatch.countDown();
                }
            }));
        }
        try {
            // 讓當(dāng)前線程處于阻塞狀態(tài)，直到鎖存器計(jì)數(shù)為零
            countDownLatch.await();
        } catch (Exception e) {
            System.out.println("系統(tǒng)出現(xiàn)異常");
        }
        Long endTime = System.currentTimeMillis();
        Long useTime = endTime - startTime;
        System.out.println("本次更新任務(wù)結(jié)束,共計(jì)用時(shí)"+useTime+"毫秒");
    }

CountDownLatch countDownLatch = new CountDownLatch(splitNList.size());

// 任務(wù)個(gè)數(shù) - 1, 直至為0時(shí)喚醒a(bǔ)wait()
countDownLatch.countDown();

 countDownLatch.await();

ThreadPoolExecutor threadPool = new ThreadPoolExecutor(10, 
50,
4, 
TimeUnit.SECONDS, 
new ArrayBlockingQueue(10), 
new ThreadPoolExecutor.DiscardPolicy()
);