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This article mainly shows you "What should be paid attention to when collecting data by crawler". The content is simple and easy to understand and the organization is clear. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn this article "What should be paid attention to when collecting data by crawler".

1, check whether there is an API, API is the website to provide official data information interface.

For example, collecting data information by calling API, collecting data within the scope permitted by the website, there is neither moral legal risk nor deliberate obstacles to setting the website; however, access to the API interface is controlled by the website, and the website can be used for charging and limiting access limits. Second, data structure analysis and data storage.

Web crawlers need to be particularly clear about which fields are needed.

Fields can exist on a web page or can be further calculated based on existing fields in the web page. Here's how to generate tables, how to join multiple tables, and so on. It should be noted that when determining field links, do not only look at a small part of the web page, because a web page may lack fields of other types of web pages, which may be due to problems with the website, or may be due to different user behaviors.

For large web crawlers, in addition to collecting data information, other important intermediate data information (such as web page ID or url) should be stored to avoid re-capturing id every time.

3. Data flow analysis.

If the page is to be mass crawled, look at the location of its entry, which is based on the collection scope. Site pages are generally tree-based structure, you can root node as the entry point, layer by layer into. Once the information flow mechanism has been identified, move on to a separate page and copy the pattern to the entire page.

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