Internet is under rapid development and changing the way of obtaining information in life vividly,it is also on the way to replace traditional media.Countless information are updated on the Internet every day,which means the whole world has in fact stepped into another era,the era of big data.Proposes a distributed system crawler to monitor the data and an algorithm to extract Web updated content based on Web structure.
NETL
NSTL
万方数据
维普
