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WebCollector is an open source web crawler framework based on Java.
WebCollector is an open source web crawler framework based on Java.It provides some simple interfaces for crawling the Web,you can setup a multi-threaded web crawler in less than 5 minutes.
Github:
https://github.com/CrawlScript/WebCollector
Demo:
https://github.com/CrawlScript/WebCollector/blob/master/YahooCrawler.java
Piscator is a small SQL/XML search engine. Once an XML feed is loaded, it can be queried using plain SQL. The setup is almost identical to the DB2 side tables approach.