線程池批量處理數據

	public void runUpdate(List<SysSiteMapUrlBean> shoplist) throws Exception{
		// 開始時間
        long start = System.currentTimeMillis();
		  // 每5000條數據開啓一條線程
        int threadSize = 5000;
        // 總數據條數
        int dataSize = shoplist.size();
         // 線程數
        int threadNum = dataSize / threadSize + 1;
        // 定義標記,過濾threadNum爲整數
        boolean special = dataSize % threadSize == 0;
        
        // 創建一個線程池
        ExecutorService exec = Executors.newFixedThreadPool(threadNum);
        // 定義一個任務集合
        List<Callable<Integer>> tasks = new ArrayList<Callable<Integer>>();
        Callable<Integer> task = null;
        List<SysSiteMapUrlBean> cutList = null;
        
        // 確定每條線程的數據
        for (int i = 0; i < threadNum; i++) {
            if (i == threadNum - 1) {
                if (special) {
                    break;
                }
                cutList = shoplist.subList(threadSize * i, dataSize);
            } else {
                cutList = shoplist.subList(threadSize * i, threadSize * (i + 1));
            }
            System.out.println("第" + (i + 1) + "組：" + cutList.toString());
            final List<SysSiteMapUrlBean> listStr = cutList;
            task = new Callable<Integer>() {

                @Override
                public Integer call() throws Exception {
                   //線程要執行的方法
                	sysSiteMapUrlService.batchAdd(listStr);
                    return 1;
                }
            };
            // 這裏提交的任務容器列表和返回的Future列表存在順序對應的關係
            tasks.add(task);
        }

        List<Future<Integer>> results = exec.invokeAll(tasks);

        for (Future<Integer> future : results) {
            System.out.println(future.get());
        }

        // 關閉線程池
        exec.shutdown();
        System.out.println("線程任務執行結束");
        System.err.println("執行任務消耗了 ：" + (System.currentTimeMillis() - start) + "毫秒");
		
	}