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Spidering Hacks by Tara Calishain 

Spidering Hacks by Tara Calishain

 

 
 
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Published:  December 08, 2009
 
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Slide 1: Spidering Hacks by Tara Calishain Perl-Intensive Book On Web Crawler Design Written for developers, researchers, technical assistants, librarians, and power users, Spidering Hacks provides expert tips on spidering and scraping methodologies. Youll begin with a crash course in spidering concepts, tools (Perl, LWP, out-of-the-box utilities), and ethics (how to know when youve gone too far: whats acceptable and unacceptable). Next, youll collect media files and data from databases. Then youll learn how to interpret and understand the data, repurpose it for use in other applications, and even build authorized interfaces to integrate the data into your own content. By the time you finish Spidering Hacks, youll be able to:Aggregate and associate data from disparate locations, then store and manipulate the data as you like Gain a competitive edge in business by knowing when competitors products are on sale, and comparing sales ranks and product placement on e-commerce sitesIntegrate third-party data into your own applications or web sitesMake your own site easier to scrape and more usable to othersKeep up-to-date with your favorite comics strips, news stories, stock tips, and more without visiting the site
Slide 2: every dayLike the other books in OReillys popular Hacks series, Spidering Hacks brings you 100 industrial-strength tips and tools from the experts to help you master this technology. If youre interested in data retrieval of any type, this book provides a wealth of data for finding a wealth of data. Personal Review: Spidering Hacks by Tara Calishain A spider (also known as a web crawler or web robot) is a program which browses the World Wide Web in a methodical, automated manner. This book is about how to create programs that perform the functions of a web crawler, with most of the Hacks being written in Perl. Like the rest of the Hacks series, this book presents 100 bite-sized chunks of code or technique to tackle specific activities. In this book these range from the simple - how to download a set of image files - to the complex - crossreferring the output from one site with another to generate a third set of data. No matter what the complexity, each hack is clearly explained, with the code samples balanced with instructions, examples and notes on how to hack the hack. As already mentioned, the hacks in this book mostly use Perl, though scattered here and there you'll find some Java, Python and PHP. If you really hate Perl, then you will not like this book. On the other hand the authors assume only a rudimentary knowledge of Perl, and there is no requirement for any knowledge of network programming of any description. After the opening chapter which gives guidance of being a good spidering citizen (how to respect the sites you are taking data from), there is a second chapter which details how to create a spidering toolkit (how to find and install the site of modules that many of the hacks depend on). With a toolkit in place and a knowledge of good behavior, the book dives into the various hacks that are organized by topic: collecting media files, gleaning data from databases (with many examples for Yahoo!, Amazon, Google, Alexa and other popular information sources), maintaining your collections (more automation with "cron" or other scheduling tools) and a final chapter on giving something back (creating a web service, generating RSS feeds and so on). The bulk of the hacks are in chapter four, which looks at extracting data from databases. Aside from the obvious sources such as Amazon and Google, these including online banks, tracking FedEx packages and more. There are a range of techniques used to grab and filter the data, so even if a data source you want to use isn't listed, the chances are that one of these hacks can be refactored to do what you want. If Perl is not your thing then the very light sprinkling of non-Perl hacks probably isn't enough to make this a worthwhile purchase. If you're a Perl hacker interested in spidering there is a ton of stuff for you here without doubt. Also, if you are a student looking for a good supplement on building a web spider from scratch, this is probably not the book for you either, but the various hacks will give you some ideas on what you might want to do in
Slide 3: your own spider if you wish to write one in a higher level language such as Java. Amazon does not show the table of contents so I do that here for completeness: Chapter 1. Walking Softly 1. A Crash Course in Spidering and Scraping 2. Best Practices for You and Your Spider 3. Anatomy of an HTML Page 4. Registering Your Spider 5. Preempting Discovery 6. Keeping Your Spider Out of Sticky Situations 7. Finding the Patterns of Identifiers Chapter 2. Assembling a Toolbox Perl Modules Resources You May Find Helpful 8. Installing Perl Modules 9. Simply Fetching with LWP::Simple 10. More Involved Requests with LWP::UserAgent 11. Adding HTTP Headers to Your Request 12. Posting Form Data with LWP 13. Authentication, Cookies, and Proxies 14. Handling Relative and Absolute URLs 15. Secured Access and Browser Attributes 16. Respecting Your Scrapee's Bandwidth 17. Respecting robots.txt 18. Adding Progress Bars to Your Scripts 19. Scraping with HTML::TreeBuilder 20. Parsing with HTML::TokeParser 21. WWW::Mechanize 101 22. Scraping with WWW::Mechanize 23. In Praise of Regular Expressions 24. Painless RSS with Template::Extract 25. A Quick Introduction to XPath 26. Downloading with curl and wget 27. More Advanced wget Techniques 28. Using Pipes to Chain Commands 29. Running Multiple Utilities at Once 30. Utilizing the Web Scraping Proxy 31. Being Warned When Things Go Wrong 32. Being Adaptive to Site Redesigns Chapter 3. Collecting Media Files 33. Detective Case Study: Newgrounds 34. Detective Case Study: iFilm 35. Downloading Movies from the Library of Congress 36. Downloading Images from Webshots 37. Downloading Comics with dailystrips 38. Archiving Your Favorite Webcams 39. News Wallpaper for Your Site 40. Saving Only POP3 Email Attachments
Slide 4: 41. Downloading MP3s from a Playlist 42. Downloading from Usenet with nget Chapter 4. Gleaning Data from Databases 43. Archiving Yahoo! Groups Messages with yahoo2mbox 44. Archiving Yahoo! Groups Messages with WWW::Yahoo::Groups 45. Gleaning Buzz from Yahoo! 46. Spidering the Yahoo! Catalog 47. Tracking Additions to Yahoo! 48. Scattersearch with Yahoo! and Google 49. Yahoo! Directory Mindshare in Google 50. Weblog-Free Google Results 51. Spidering, Google, and Multiple Domains 52. Scraping Amazon.com Product Reviews 53. Receive an Email Alert for Newly Added Amazon.com Reviews 54. Scraping Amazon.com Customer Advice 55. Publishing Amazon.com Associates Statistics 56. Sorting Amazon.com Recommendations by Rating 57. Related Amazon.com Products with Alexa 58. Scraping Alexa's Competitive Data with Java 59. Finding Album Information with FreeDB and Amazon.com 60. Expanding Your Musical Tastes 61. Saving Daily Horoscopes to Your iPod 62. Graphing Data with RRDTOOL 63. Stocking Up on Financial Quotes 64. Super Author Searching 65. Mapping O'Reilly Best Sellers to Library Popularity 66. Using All Consuming to Get Book Lists 67. Tracking Packages with FedEx 68. Checking Blogs for New Comments 69. Aggregating RSS and Posting Changes 70. Using the Link Cosmos of Technorati 71. Finding Related RSS Feeds 72. Automatically Finding Blogs of Interest 73. Scraping TV Listings 74. What's Your Visitor's Weather Like? 75. Trendspotting with Geotargeting 76. Getting the Best Travel Route by Train 77. Geographic Distance and Back Again 78. Super Word Lookup 79. Word Associations with Lexical Freenet 80. Reformatting Bugtraq Reports 81. Keeping Tabs on the Web via Email 82. Publish IE's Favorites to Your Web Site 83. Spidering GameStop.com Game Prices 84. Bargain Hunting with PHP 85. Aggregating Multiple Search Engine Results 86. Robot Karaoke 87. Searching the Better Business Bureau 88. Searching for Health Inspections
Slide 5: 89. Filtering for Content Chapter 5. Maintaining Your Collections 90. Using cron to Automate Tasks 91. Scheduling Tasks Without cron 92. Mirroring Web Sites with wget and rsync 93. Accumulating Search Results Over Time Chapter 6. Giving Back to the World 94. Using XML::RSS to Repurpose Data 95. Placing RSS Headlines on Your Site 96. Making Your Resources Scrapable with Regular Expressions 97. Making Your Resources Scrapable with a REST Interface 98. Making Your Resources Scrapable with XML-RPC 99. Creating an IM Interface 100. Going Beyond the Book For More 5 Star Customer Reviews and Lowest Price: Spidering Hacks by Tara Calishain 5 Star Customer Reviews and Lowest Price!

   
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