java 常用方法

1、批次新增数据

        // 数据        
        List dataList = new ArrayList();
        // 默认一次新增数据量
        int defaultNumber = 100;
		if (dataList.size() > defaultNumber) {
			// 多次处理数据
			int start = 0, end = defaultNumber;
			List> datas = null;
			while (start < dataList.size()) {
                // 截取数据
				datas = dataList.subList(start, end);
				ret += dbTableMapper.batchInsertData(datas);
				start = end;
				int newEnd = end + defaultNumber;
				if (newEnd > dataList.size()) {
					end = dataList.size();
				} else {
					end += defaultNumber;
				}
			}
		} else {
			ret = dbTableMapper.batchInsertData(dataList);
		}