http://stackoverflow.com/questions/3087871/crawler-on-appengine
http://code.google.com/p/jyf-code/source/browse/trunk/gae/jyfbot/bot.py
http://aws.amazon.com/search-engines/
amazon Search Engines & Web Crawlers
Objectify-Appengine 或 Objectify 是一个 ORM 类的库，它简化 Bigtable 以及 GAE
中的数据持久性。作为一个映射层，Objectify 通过一个简洁的 API 将自身插入到 POJOs 与 Google
的重型设备之间。您可以使用一个熟悉的 JPA 注释子集（尽管 Objectify 不实现完整的规范）以及少量生命周期注释，来存留和检索 Java
对象形式的数据。从本质上讲，Objectify 是为 Google 的 Bigtable 明确设计的一个轻量级 Hibernate。
Objectify 与 Hibernate
的类似之处在于，它允许您针对 Bigtable 映射和利用 POJOs，您将这个看作是 GAE 中的一个抽象。除了 JPA
注释的子集之外，Objectify 运用其自己的注释，这体现了 GAE 数据存储的独特功能。Objectify
还允许关系，显示一个查询界面来支持 GAE 筛选和排序概念。
Apache Droids
droids-crawler
https://cwiki.apache.org/DROIDS/droids-crawler.html
http://code.google.com/p/gwt-platform/
http://code.google.com/p/gwt-platform/source/browse/#hg%2Fgwtp-samples%2Fgwtp-sample-crawler-service
Web crawlers and Google App Engine Hosted applications
Is it impossible to run a web crawler on GAE along side with my app considering the I am running the free startup version?
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google-app-engine
While Google hadn't exposed To do crawling from GAE, you have to split your application into You'd manually have to watch your quota usage and start heartbeat when you have spare quota, and stop if it is used up. When Google introduces the APIs I've told in the beginning you'd have UPDATE: Google introduced Task Queue API some time ago. See task queue docs for python and java.
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App Engine code only runs in
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I suppose you can (i.e., it's not impossible to) run it, but it will be slow and you'll run into limits quite quickly. As CPU quotas are going to be decreased at the end of May even further, I'd recommend against it.
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It's possible. But that's not
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Your Answer
gae