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This article mainly explains "what are the differences between focused reptiles and ordinary reptiles". Interested friends might as well take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what are the differences between focus reptiles and ordinary reptiles"!

Summary of the working principle and key technologies of crawlers:

Web crawler is an automatic extraction program for downloading web pages from the Internet for search engines, and it is an important part of search engines. The conventional crawler starts from the URL of one or more initial web pages, obtains the URL of the initial web page, and in the process of crawling the web page, constantly extracts new URL from the current page until some stop condition of the system is satisfied.

Compared with ordinary web crawlers, a focused crawler needs to solve three main problems:

1. Describe or define the capture target.

2. Analyze and filter web pages or data.

3. Search URL strategy.

How to make web page analysis algorithm and URL search strategy is the basis to determine the crawling target. Among them, Web analysis algorithm and candidate URL sorting algorithm are the key to determine the service form and crawling behavior provided by search engines. There is a close relationship between the two algorithms.

Big data's popularity, web crawler has become the mainstream technology, not only programmers, now even ordinary users have a simple understanding of crawler knowledge, but also know how to use proxy IP to crawl. As we all know, crawlers can get website information, so what are the benefits to focus web crawlers? Does this belong to a crawler technology? Next, we're going to start a story about how to focus on reptiles.

The workflow of focus crawler is complex, so it is necessary to filter the links that have nothing to do with the topic according to certain analysis algorithms, retain the useful links, and then put them into the URL queue waiting to be crawled. Then, according to a specific search strategy, it selects the next web page URL that it wants to crawl from the queue, and repeats the above steps until a certain standard of the system is reached.

In addition, all the pages crawled by the crawler will be saved through the system for some analysis. Filter and index for query and retrieval later; for focused crawlers, the analysis results obtained through this process can also provide feedback and guidance for the subsequent crawling process.

At this point, I believe you have a deeper understanding of what is the difference between focused reptiles and ordinary reptiles. You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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