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Perl & LWP (Classique Us) (Englisch) Taschenbuch – 2. Juli 2002


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Produktinformation

  • Taschenbuch: 264 Seiten
  • Verlag: O'Reilly & Associates; Auflage: 1 (2. Juli 2002)
  • Sprache: Englisch
  • ISBN-10: 0596001789
  • ISBN-13: 978-0596001780
  • Größe und/oder Gewicht: 17,8 x 1,7 x 23,3 cm
  • Durchschnittliche Kundenbewertung: 4.0 von 5 Sternen  Alle Rezensionen anzeigen (1 Kundenrezension)
  • Amazon Bestseller-Rang: Nr. 359.115 in Fremdsprachige Bücher (Siehe Top 100 in Fremdsprachige Bücher)
  • Komplettes Inhaltsverzeichnis ansehen

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Produktbeschreibungen

Amazon.de

Perl & LWP sets out to unwrap the Library for the Web in Perl (LWP), which is a collection of modules that make it easier to access and pick apart Web pages (and FTP-accessible files, and outgoing e-mail messages) from within your Perl programs. The book succeeds wonderfully, not only in conveying the technical aspects of LWP programming, but in making clear the fun of doing work that's very well suited to Perl. Sean Burke assumes that his readers know something about Perl, albeit not much, and a similar amount about HTML. He does a great job of explaining how LWP functions fit into Perl programs, and how you can use them to make reference to Internet resources far more easily than before.

Burke's narrative takes the form of a guided tour in which he introduces his readers to aspects of the LWP modules one by one. His tone is generally straightforward (sharp commentary alternates with brief code listings, with occasional passages of reference material), but there's sometimes an undercurrent of exuberance that makes the reader want to get going with his or her own programming right away. Overall, the emphasis is on teaching both LWP and Perl itself to the extent necessary to do LWP work. Because of the concise and nicely indexed code modules, though, you'll find this book useful as a reference after you're under way with LWP. --David Wall

Topics covered: How to program with LWP and Perl itself. All of LWP's strong points--including HTML parsing (with tokens and trees as well as with regular expressions), HTML generation and modification, manipulation of HTML forms, and the operation of spiders--are covered. This book has more of a tutorial tone than any similar reference material on the Internet.

Synopsis

This volume on Perl and LWP covers topics including: understanding LWP and its design; fetching and analyzing URLs; extracting information from HTML using regular expressions and tokens; working with the structure of HTML documents using trees; setting and inspecting HTTP headers and response codes; managing cookies; accessing information that requires authentication; extracting links; cooperating with proxy caches; and writing Web spiders (also known as robots) in a safe fashion. It also includes many step-by-step examples that show how to apply the various techniques. Programs to extract information from Websites such as BBC News, Altavista, ABEBooks.com, and the Weather Underground, are explained in detail. The guide shows how to make Web requests, submit forms, and even provide authentication information, and it demonstrates using regular expressions, tokens, and trees to parse HTML.

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9 von 9 Kunden fanden die folgende Rezension hilfreich Von Gregor Theis am 6. Januar 2003
Format: Taschenbuch Verifizierter Kauf
Das Buch „Perl & LWP" von Sean S. Burke beschreibt die Verwendung von Perl und der Perl LWP (libwww-perl) Bibliothek und einiger Zusatzmodule zum Herunterladen von Web Seiten mit Perl und zur anschließenden Analyse dieser Daten. Mit diesen Modulen kann man Programme schreiben, die Daten aus dem Web sammeln und diese nach eigenen Wünschen aufbereiten.
HTML Seiten aus dem Internet zu laden ist verhältnismäßig einfach mit LWP. Schwieriger ist diese Seiten zu bearbeiten und die gewünschten Daten zu extrahieren. Sean Burke geht sehr intensiv auf die Daten Extraktion ein und bemüht sich uns ein robustes Vorgehen bei der Programmierung beizubringen (bei der Daten Analyse vor allem defensiv programmieren).
Man wird nach diesem Buch nicht vollständig um das Studium der Dokumentation der einzelnen Module herumkommen (z.B. um weitere Informationen zur Verwendung von Proxies mit Passwort zu sammeln). Dieses Buch ist ein Einführungsbuch in das Thema, nachdem man schon viele Dinge mit LWP machen kann und die Online Dokumentation verstehen kann.
Sehr schön ist der Anhang G mit einem Abdruck eines Artikels von Sean S Burke zum Thema „objektorientierte Module verwenden", was einen guten Einblick in die Verwendung von OO Modulen gibt.
Ich würde diesem Buch gerne 4,5 Sterne geben, da ich es für ein sehr gutes Perl Buch halte aber es meiner Meinung nach nicht so gut ist wie „Einführung in Perl" (bzw. „Learning Perl"). Der Stil von "Perl & LWP" ist auch sehr locker und gut zu Lesen.
Leider gibt es in dieser Auflage eine Reihe von Fehlern im Druck. Man sollte sich die Errata auf dem Seite von O'Reilly zu diesem Buch ansehen, bevor man zu frustriert ist.
Lesen Sie weiter... ›
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Die hilfreichsten Kundenrezensionen auf Amazon.com (beta)

Amazon.com: 12 Rezensionen
18 von 18 Kunden fanden die folgende Rezension hilfreich
Excellent coverage of LWP, packed full of useful examples 16. Juli 2002
Von Gavin - Veröffentlicht auf Amazon.com
Format: Taschenbuch
I was definitely interested when I first heard that O'Reilly were publishing a book on LWP. LWP is a definitive collection of perl modules covering everything you could think of doing with URIs, HTML, and HTTP. While 'web services' are the buzzword friendly technology of the day, sometimes you need to roll your sleeves up and get a bit dirty scraping screens and hacking at HTML. For such a deep subject, this book weighs in at a slim 242 pages. This is a very good thing. I'm far too busy to read these massive shelf-destroying tomes that seem to be churned out recently.
It covers everything you need to know with concise examples, which is what makes this book really shine. You start with the basics using LWP::Simple through to more advanced topics using LWP::UserAgent, HTTP::Cookies, and WWW::RobotRules. Sean shows finger saving tips and shortcuts that take you more than a couple notches above what you can learn from the lwpcook manpage, with enough depth to satisfy somebody who is an experienced LWP hacker.

This book is a great reference, just flick through and you'll find a relevant chapter with an example to save the day. Chapters include filling in forms and extracting data from HTML using regular expressions, then more advanced topics using HTML::TokeParser, and then my preferred tool, the author's own HTML::TreeBuilder. The book ends with a chapter on spidering, with excellent coverage of design and warnings to get your started on your web trawling.
15 von 15 Kunden fanden die folgende Rezension hilfreich
This book can teach you expert-level web scraping/munging. 12. Juli 2003
Von wickline - Veröffentlicht auf Amazon.com
Format: Taschenbuch
If you aren't yet comfortable using object-oriented Perl modules, the multitude of examples will at least allow you see how it's done even if you're a bit fuzzy on what's happening 'underneath' when you call object methods. If you're comfortable learning how to do something without knowing exactly why it works, then the author's clear step-by-step explantions and numerous progressively more powerful examples should make this book accessible even to relatively innexperienced Perl programmers.
More experienced programmers will understand better why things work, but any Perl programmer will set this book down feeling empowered to turn the web into their own valet. No longer do you need to check multiple sites looking for interesting information. Instead, you can readily author code to do that for you and alert you when items of interest are found. You can use these tools to free up personal time, to harvest information to inform business decisions, to automate tedious web application testing, and a zillion other things.
The author's clear exploration of the relevant Perl modules leaves the reader with a good depth of understanding of what these modules do, when you might want to use which module, and how to use them for real world tasks. Before reading the book, I knew of these modules, but they were a rather intimidating pile. I'd used a few of them on occasion for rather limited projects, but was reluctant to invest the time required to read all of the documentation from the whole collection. Mountains of method-level documentation do not a tutorial make. This book takes all of that information, selects the most important parts, and ensures that those parts are covered in progressively more powerful and/or flexible examples.
If you know Perl and you're sick of 'working the web' to get information and you want the web to work for you instead, then you need this book. I had a personal project that was on the back burner for a couple of years because it just sounded too hard. The weekend after I finished this book, I wrote what I had previously thought to be the hard part of that project and it was both easy and fun. This book makes hard things not just possible, but actually easy.
-matt
14 von 14 Kunden fanden die folgende Rezension hilfreich
Very Informative and useful 8. August 2002
Von "sherzodr" - Veröffentlicht auf Amazon.com
Format: Taschenbuch
As a web programmer, I had dealt with several such projects dealing with web automation and writing simple crawlers even before I read "Perl & LWP". The book was the first book I've read on the subject, and I'm by no means disappointed. The book is very well organized, very informative and nails the subject in the head. I am pleased.
I noticed some inaccuracies in the discussions, some chopped off paragraphs and sentences. But this doesn't affect the usability of the book much. Author Sean Burke does a great job in walking one through the most of the aspects of web automation and data extraction in the web using Perl and LWP (libwww in Perl ).
The codes the book gives are very well organized, well written and easily debugable. The steps are pretty consistent across all the examples:
a) Inspect the HTML source code of the page;
b) Determine the tokens and patterns of interest;
c) Write the first code;
d) Fine tune the code;
As usual, I'll be commenting on individual chapters to give you an idea of the
coverage of the book in more details...
9 von 9 Kunden fanden die folgende Rezension hilfreich
Fabulous book! 31. August 2002
Von K. Boggs - Veröffentlicht auf Amazon.com
Format: Taschenbuch
This book is a comprehensive and authoritative guide to web automation. It reads as both a gentle tutorial and a well organized reference. Basic HTTP operation, regexp HTML parsing, tokenizing, cookie authentication, form handling, and robot spidering are covered extensively in numerous case studies and practical examples.
Naturally, I was impressed by the simple, consistent treatment of examples: inspect source and find the interesting bits, code things up and then enhance to suit. :-)
A particularly satisfying thing to me is the sane way of working, that the author assumes. So many people seem to just bungle their way through web programming while ignoring basics like the robots.txt file. This book helps to prevent this.
One would think that only a thick tome would be sufficient to cover such vast territory, but the author (who is an active LWP module developer) does a fabulous job covering this extensive subject matter.
I recommend this book both to anyone starting out on their way to working with the underside of the web and to accomplished professionals in need of a full reference manual.
8 von 8 Kunden fanden die folgende Rezension hilfreich
A must-read for exploiting the web in a GOOD way. 11. Juli 2002
Von Kevin Healy - Veröffentlicht auf Amazon.com
Format: Taschenbuch
A great book for anyone who wishes to automate daily tasks on the web. Sean does an outstanding job of showing how Perl can be used to extract and manipulate not just data but useful information efficiently from the web's vast data resources. I've already adapted an example from this book (link-checking spider) for sites I maintain. Yes, I've known of the LWP module prior to this book. But as a lazy programmer, I rely on others to show me the way. Sean does just that...
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