Shulou(Shulou.com)06/02 Report--

This article mainly talks about "what are the Java crawler technologies". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what are the Java crawler techniques?"

1. Jsoup

The HTML parser can directly parse a URL address and HTML text content. It provides a very labor-saving API that can fetch and manipulate data through DOM,CSS and jQuery-like operations. This is also the earliest crawler technology I used.

II. HtmlUnit

HtmlUnit is an interface-free browser library for java. It simulates HTML documents and provides the corresponding API, allowing you to call pages, fill out forms, click links, and so on. It is a way to simulate a browser for testing purposes. With HtmlUnit, you feel like you are operating a browser, and it supports both css and js.

III. Selenium

Selenium is a tool for testing Web applications. The Selenium test runs directly in the browser, just like a real user is working on it. Supported browsers include IE (7, 8, 9, 10, 11), Mozilla Firefox,Safari,Google Chrome,Opera, etc.

Selenium I think is the best crawler tool because it completely simulates the browser. The browser is dropped from the program to simulate the operation of a human. About Selenium in my article [Selenium sharp weapon! Liberate the hands of test programmers] there is a special explanation.

Finally, reptiles are risky and should be used with caution. It is hoped that the majority of programmers will have a sense of data privacy when using crawler technology.

The following content comes from the network:

If the crawler program collects personal information such as a citizen's name, identity document number, communication and contact information, address, account password, property status, whereabouts, and so on, and uses it in an illegal way, it certainly constitutes an illegal act of illegally obtaining citizens' personal information.

In addition, according to relevant regulations, whoever, in violation of the relevant regulations of the state, sells or provides personal information of citizens to others, if the circumstances are serious, steal or illegally obtain personal information of citizens by other means, may constitute a "crime of infringing upon a citizen's personal information" and shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention, and concurrently or independently be sentenced to a fine. If the circumstances are especially serious, the offender shall be sentenced to fixed-term imprisonment of not less than three years and not more than seven years, and concurrently be sentenced to a fine.

At this point, I believe that everyone has a deeper understanding of "Java crawler technology", might as well come to the actual operation of it! Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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