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Re:How to write a crawler by elchief on Monday September 30, 2013 @01:24AM (#6467951)
crawler4j is a nice open source (Apache 2) Java web crawler.

Multi-threaded. Built-in page delay (200ms default). Does HTTPS, headers, POST, cookies, follows robots.txt .

I prefer it to nutch for small to medium sized jobs.

https://code.google.com/p/crawler4j/

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