jsoup 是一款 Java 的HTML 解析器，可直接解析某个URL地址、HTML文本内容。它提供了一套非常省力的API，可通过DOM，CSS以及类似于
JQuery的操作方法来取出和操作数据。
jsoup的主要功能如下：
从一个URL，文件或字符串中解析HTML；
使用DOM或CSS选择器来查找、取出数据；
可操作HTML元素、属性、文本；
jsoup是基于MIT协议发布的，可放心使用于商业项目。
此次更新内容：
改进
Added a new pseudo selector :matchText, which allows text nodes to match as if they were elements. This enables finding text that is only marked by a brtag, for example.
Change: marked Connection.validateTLSCertificates() as deprecated.
Normalize invisible characters (like soft-hyphens) in Element.text().
Added Element.wholeText(), to easily get the un-normalized text value of an element and its children.
bug 修复
Bugfix: in a deep DOM stack, a StackOverFlow exception could occur when generating implied end tags.
Bugfix: when parsing attribute values that happened to cross a buffer boundary, a character was dropped.
Bugfix: fixed an issue that prevented using infinite timeouts in Jsoup.Connection.
Bugfix: whitespace preserving tags were not honoured when nested deeper than two levels deep.
Bugfix: an unterminated comment token at the end of the HTML input would cause an out of bounds exception.
Bugfix: an NPE in the Cleaner which would occur if an <a href> attribute value was missing.
Bugfix:
when serializing the same document in a multiple threads, on Android,
with a character set that is not ascii or UTF-8, an encoding exception
could occur.
Bugfix: removing a form value from the DOM would not remove it from FormData.
Bugfix: in the W3CDom transformer, siblings were incorrectly inheriting namespaces defined on previous siblings.
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