怎么进行JSOUP 爬虫的分析

这期内容当中小编将会给大家带来有关怎么进行JSOUP 爬虫的分析，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

• 规则编写说明文档

• 通用选择器（*）是隐含在没有元素选择器提供 (i.e. *.header and .header is equivalent).

  样式	匹配	例子
  *	任何元素	*
  tag	通过Tga标签获取元素	div
  ns|E	elements of type E in the namespace ns	fb|name finds elements
  #id	elements with attribute ID of "id"	div#wrap, #logo
  .class	elements with a class name of "class"	div.left, .result
  [attr]	elements with an attribute named "attr" (with any value)	a[href], [title]
  [^attrPrefix]	elements with an attribute name starting with "attrPrefix". Use to find elements with HTML5 datasets	[^data-], div[^data-]
  [attr=val]	elements with an attribute named "attr", and value equal to "val"	img[width=500], a[rel=nofollow]
  [attr="val"]	elements with an attribute named "attr", and value equal to "val"	span[hello="Cleveland"][goodbye="Columbus"], a[rel="nofollow"]
  [attr^=valPrefix]	elements with an attribute named "attr", and value starting with "valPrefix"	a[href^=http:]
  [attr$=valSuffix]	elements with an attribute named "attr", and value ending with "valSuffix"	img[src$=.png]
  [attr*=valContaining]	elements with an attribute named "attr", and value containing "valContaining"	a[href*=/search/]
  [attr~=regex]	elements with an attribute named "attr", and value matching the regular expression	img[src~=(?i)\\.(png|jpe?g)]
  	The above may be combined in any order	div.header[title]
  	组合器
  E F	an F element descended from an E element	div a, .logo h2
  E > F	an F direct child of E	ol > li
  E + F	an F element immediately preceded by sibling E	li + li, div.head + div
  E ~ F	an F element preceded by sibling E	h2 ~ p
  E, F, G	all matching elements E, F, or G	a[href], div, h4
  	伪选择器
  :lt(n)	elements whose sibling index is less than n	td:lt(3) finds the first 3 cells of each row
  :gt(n)	elements whose sibling index is greater than n	td:gt(1) finds cells after skipping the first two
  :eq(n)	elements whose sibling index is equal to n	td:eq(0) finds the first cell of each row
  :has(selector)	elements that contains at least one element matching the selector	div:has(p) finds divs that contain p elements
  :not(selector)	elements that do not match the selector. See also Elements.not(String)	div:not(.logo) finds all divs that do not have the "logo" class. div:not(:has(div)) finds divs that do not contain divs.
  :contains(text)	elements that contains the specified text. The search is case insensitive. The text may appear in the found element, or any of its descendants.	p:contains(jsoup) finds p elements containing the text "jsoup".
  :matches(regex)	elements whose text matches the specified regular expression. The text may appear in the found element, or any of its descendants.	td:matches(\\d+) finds table cells containing digits. div:matches((?i)login) finds divs containing the text, case insensitively.
  :containsOwn(text)	elements that directly contain the specified text. The search is case insensitive. The text must appear in the found element, not any of its descendants.	p:containsOwn(jsoup) finds p elements with own text "jsoup".
  :matchesOwn(regex)	elements whose own text matches the specified regular expression. The text must appear in the found element, not any of its descendants.	td:matchesOwn(\\d+) finds table cells directly containing digits. div:matchesOwn((?i)login) finds divs containing the text, case insensitively.
  	The above may be combined in any order and with other selectors	.light:contains(name):eq(0)
  结构伪选择器
  :root	The element that is the root of the document. In HTML, this is the html element	:root
  :nth-child(an+b)	elements that have an+b-1 siblings before it in the document tree, for any positive integer or zero value of n, and has a parent element. For values of a and b greater than zero, this effectively divides the element's children into groups of a elements (the last group taking the remainder), and selecting the bth element of each group. For example, this allows the selectors to address every other row in a table, and could be used to alternate the color of paragraph text in a cycle of four. The a and b values must be integers (positive, negative, or zero). The index of the first child of an element is 1. In addition to this, :nth-child() can take odd and even as arguments instead. odd has the same signification as 2n+1, and even has the same signification as 2n.	tr:nth-child(2n+1) finds every odd row of a table. :nth-child(10n-1) the 9th, 19th, 29th, etc, element. li:nth-child(5) the 5h li
  :nth-last-child(an+b)	elements that have an+b-1 siblings after it in the document tree. Otherwise like :nth-child()	tr:nth-last-child(-n+2) the last two rows of a table
  :nth-of-type(an+b)	pseudo-class notation represents an element that has an+b-1 siblings with the same expanded element name before it in the document tree, for any zero or positive integer value of n, and has a parent element	img:nth-of-type(2n+1)
  :nth-last-of-type(an+b)	pseudo-class notation represents an element that has an+b-1 siblings with the same expanded element name after it in the document tree, for any zero or positive integer value of n, and has a parent element	img:nth-last-of-type(2n+1)
  :first-child	elements that are the first child of some other element.	div > p:first-child
  :last-child	elements that are the last child of some other element.	ol > li:last-child
  :first-of-type	elements that are the first sibling of its type in the list of children of its parent element	dl dt:first-of-type
  :last-of-type	elements that are the last sibling of its type in the list of children of its parent element	tr > td:last-of-type
  :only-child	elements that have a parent element and whose parent element hasve no other element children
  :only-of-type	an element that has a parent element and whose parent element has no other element children with the same expanded element name
  :empty	elements that have no children at all

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