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This article is about how to use maven to implement Jsoup crawler. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

First, a brief introduction to Jsoup

Jsoup is a Java HTML parser that 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.

What can we do with Jsoup

2.1 scrape and parse HTML to find and extract data from URL, files, or strings

2.2 manipulate HTML elements, attributes, and text using DOM traversal or CSS selectors

2.3 so that we can output the neat text we want

Third, use Jsoup to crawl an example

As can be seen from the picture, we can successfully crawl the title of the popular sales of women's wear from high to low, so that we can analyze the title name of high sales (or comprehensive ranking) in the front column. Thus, the naming rules of popular goods can be analyzed.

IV. Jsoup usage

4.1First, create maven project and inject dependency on maven project

4.2Dependencies need to be imported after injecting dependencies, otherwise using Jsoup in the program will report all errors.

4.3 use the knowledge of JSP to find the target elements

If we find that the ID of the target page is "plist" at some east interface, then we use the

GetElementById ("plist"); method to get his ID

Then get the target title, which can be analyzed from the image above, and the title is controlled by the tag, so we need to use

GetElementsByTag ("em"); to capture the part of em

Finally, loop out his part.

V. Summary

Jsoup can only be used for simple page capture, in actual development, many websites use Ajax technology to make the module in the dynamic change or anti-crawler technology, so this technology has limitations. Students who are familiar with front-end jsp technology should be able to handle it.

Finally, all the codes are attached.

Thank you for reading! This is the end of this article on "how to use maven to achieve Jsoup crawler". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!

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