This project forked from 3zamn/bigxmlconvertdb
超大xml解析导入数据库、千万级别大数据导出到Excel。实现核心：高性能、分段、分页循环：读取-写入-清空内存。解决传统方式的超大数据导致内存溢出
超大xml解析导入数据库、千万级别大数据导出到Excel。实现核心：高性能、分段、分页循环：读取-写入-清空。解决传统方式的超大数据导致内存溢出
1.xml解析以dom4j的事件驱动、分段边读边写（预处理sql批量写入数据库）、写完清空内存的实现思路解决超大xml解析时的内存溢出问题。 2.大数据导出到Excel、使用SXSSFWorkbook方式分页可以写入多个sheet中。
测试结果：（本地机器配置较低） 1.500M大小xml文件解析写入到mysql、插入200万条记录耗时100秒左右。 2.500万条数据从mysql导出到Excel、每个sheet写入100万条。耗时10分钟左右
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