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Htmlparser is a pure java-written html parsing library; htmlparser does not depend on other java library files, and is mainly used to transform or extract html. HTML can be parsed in a linear or nested way, which can be understood as a web page information crawling tool.

The operating environment of this tutorial: windows10 system, HTML5 version, Dell G3 computer.

What does htmlparser mean?

Htmlparser is a pure java-written html parsing library, which does not depend on other java library files, and is mainly used to transform or extract html. It can parse html at very high speed without error. The latest version of htmlparser is now 2.1. It is no exaggeration to say that htmlparser is by far the best tool for html parsing and analysis.

HTML Parser is a Java library for parsing HTML in a linear or nested manner. Used primarily for transformation or extraction, it has filters, visitors, custom tags, and an easy-to-use JavaBeans. It is a fast, powerful and well-tested software package.

The two basic use cases handled by the parser are extraction and transformation (compositing use cases, creating HTML pages from scratch, preferably handled by other tools closer to the data source). Although previous versions focused on extracting data from web pages, version 1.4 of HTMLParser made substantial improvements in transforming web pages, simplifying the creation and editing of tags, and the verbatim output toHtml () method.

In general, to use HTMLParser, you need to be able to write code in the Java programming language. Although some sample programs are provided that may be useful, you most likely need (or want to) create your own programs or modify the provided programs to match your expected application.

To use the library, you need to add htmllexer.jar or htmlparser.jar to your classpath at compile and run time. Htmllexer.jar provides low-level access to common string, comments, and tag nodes on the page in a linear, flat, and sequential manner. The htmlparser.jar that contains the classes in htmllexer.jar provides access to the page as a nested sequence of differentiated tags that contains strings, comments, and other markup nodes. Therefore, the output of a call to the lexer nextNode () method might be:

The output of the parser NodeIterator nests the tag as a child of, and other nodes (indented here):

The parser tries to balance the start and end tags to render the structure of the page, while the lexical analyzer simply spits out the node. If your application requires only moderate knowledge of the page structure and focuses on a single independent node, you should consider using a lightweight lexical analyzer. But if your application needs to understand the nested structure of the page, such as working with tables, you may need to use a full parser.

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