一个用java编写的网络爬虫，支持并发,但有是会因为爬取速度过快，而被屏蔽-A web crawler using java prepared to support concurrency, but because there is crawling too fast, while being shielded

创建数据库，在数据库上建立关系模式，插入数据，进行相应的查询操作；数据库的安全性与完整性；事务的并发控制-Create database, to establish the relationship model, the database insert data, carries on the corresponding query operation safety and integrity of the database concurrency control