Web Data Crawler（knowlesys）

Dec. 16, 2008 - PRLog -- Building your own web data crawler is a great way to get very specific information in whatever fields you choose, but can be trickier than most people think. In this brief article, we’ll go over some easy tips and tricks to keep in mind while constructing a spider, but first we’ll take a look at some basic information on crawlers. A web crawler is, essentially, any package of code that is designed to browse the web in a specific pattern. They can be used for data collection, website maintenance (through checking links and looking at images), search engine indexing, and much more. They are the most common type of web scraping tool, and can be used for a variety of purposes.

The basic web data crawler is a very simple bundle of code that is designed to jump from link to link, occasionally copying up text or other data that meets certain parameters. Depending on what you intend to use your crawler for, you’ll need to adjust how it behaves. For example, say you are building a spider to collect data on a certain demographic, in this case, online auction traders. You would probably want to include sites in its path like eBay, and set it to gather information on what goods are most commonly auctioned, pricing for different types of goods, etc. Conversely, a spider sent to test links on a personal website and check for errors in code will act completely differently. It is important to keep in mind what your personal purpose for your spider is.

Remember, a custom web data crawler can behave well or poorly, based on how you code it to respond to certain things. A well-behaved spider will obey commands in files like robots.txt, which dictates how automated crawlers are to respond to certain things. A well-behaved spider will announce itself and what it is, and for whom it is crawling. The benefits to having a well-behaved crawler are fairly obvious – you won’t receive complaints from webmasters who catch you crawling where you aren’t supposed to, and some serious lawsuits can result by coding a spider that ignores attempts to keep it out.

Having a web data crawler at your disposal can be a valuable resource, but it must be used correctly. As long as your crawler is respectful and obedient to webmasters’ commands, you’ll be collecting data without a hitch in no time at all.

For more information please visit http://www.knowlesys.com .

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Website URL: http://www.knowlesys.com
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Founded in 2003, Knowlesys Software Inc. has provided web data extraction services or softwares to our clients more than 500 times. Our focus is Web Data Extraction. We try to provide the best web data extraction services and softwares in the world.

At Knowlesys we continuous improve our development progress. We build four guides to improve the quality and effective of our daily work: Knowlesys Software Process Guide, Knowlesys Software Design Guide, Knowlesys Solution Framework Guide, Knowlesys Service Process Guide.

We believe that good quality software should make complicated things simpler and should make performing a variety of tasks faster, easier, and more efficient for the user.