如何从HTML中剥离无关紧要的空白 [英] How to strip insignificant whitespace out of HTML
问题描述
我必须比较不同版本的HTML页面以进行格式设置和文本更改。不幸的是，创建它们的人/公司使用某种HTML编辑器，每次都重新包装所有的HTML（并增加了大量的空白），这使得很难区分它们。所以我正在寻找一种工具（最好是一个Java库），它可以重新格式化我的HTML，以便删除所有不重要的空格和换行符。
这意味着，在
< h1>第一标题< / H1> < h2>第二标题< / h2>
< / h1> 和< h2> 应该被移除，但是在 $ b < b个格式化< / b个< I>文字< / I>
可能不会删除空格。我不关心< pre> ，< textarea> 或< script> ; blocks，也不是关于可以改变行为的CSS空格属性 - 我只是寻找一种解决方案，去除大部分不必要的空白（并且最好留下太多的空白）。
（我已经在折叠多个空格并重新添加换行符而不是空格，以使文本更具可读性 - 但仍然存在太多情况，例如标题或表格单元格/行之间的新换行符会破坏我简单的解决方案。） JTidy 可能在这里有用。它是一个HTML解析器，用于解析HTML（并且能够容忍格式不正确的HTML）并将HTML呈现为DOM，并且您可以覆盖写出来的内容以删除您不感兴趣的内容。
I have to compare different versions of HTML pages for formatting and text changes. Unfortunately the guy/company who creates them uses some kind of HTML editor that re-wraps all the HTML every time (and adds tons of whitespace), which makes it hard to diff them. So I am looking for a tool (preferrably a Java library) that can reformat my HTML in a way that all insignificant spaces and newlines get removed.
That means, in
<h1>First Headline</h1> <h2>Second headline</h2>
the space between </h1> and <h2> should be removed, but in
<b>formatted</b> <i>text</i>
the whitespace may not be removed. I do not care about <pre>, <textarea> or <script> blocks, and also not about CSS whitespace attributes that can change the behavior - I am just looking for a solution that strips most of the unnecessary whitespace (and better leave too much whitespace in than too little).
(I am already collapsing multiple whitespaces and re-adding newlines instead of whitespaces before tags to make the text more readable - but there are still too many cases where for example a new newline between headlines or table cells/rows breaks my simple "solution".)
JTidy may be of use here. It's an HTML parser that parses the HTML (and is tolerant of ill-formed HTML) and presents the HTML as a DOM, and you can override the writing out of this to remove whatever you're not interested in.
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