工作经历简介怎么写:jsoup 的选择器一览表 - 开源中国社区

选择器是 jsoup 用来从 html 文档中对元素进行过滤的强大工具。

先看下面一段例子：

1. File input = new File("/tmp/input.html");   
2. Document doc = Jsoup.parse(input, "UTF-8", "http://example.com/");   
3.   
4. Elements links = doc.select("a[href]"); // a with href   
5. Elements pngs = doc.select("img[src$=.png]");   
6.   // img with src ending .png   
7.   
8. Element masthead = doc.select("div.masthead").first();   
9.   // div with class=masthead   
10.   
11. Elements resultLinks = doc.select("h3.r > a"); // direct a after h3  

File input = new File("/tmp/input.html");Document doc = Jsoup.parse(input, "UTF-8", "http://example.com/");Elements links = doc.select("a[href]"); // a with hrefElements pngs = doc.select("img[src$=.png]");// img with src ending .pngElement masthead = doc.select("div.masthead").first();// div with class=mastheadElements resultLinks = doc.select("h3.r > a"); // direct a after h3

下面是 jsoup 所支持的选择器列表：

Selector overview

• tagname: find elements by tag, e.g. a
• ns|tag: find elements by tag in a namespace, e.g. fb|name finds elements
• #id: find elements by ID, e.g. #logo
• .class: find elements by class name, e.g. .masthead
• [attribute]: elements with attribute, e.g. [href]
• [^attr]: elements with an attribute name prefix, e.g. [^data-] finds elements with HTML5 dataset attributes
• [attr=value]: elements with attribute value, e.g. [width=500]
• [attr^=value], [attr$=value], [attr*=value]: elements with attributes that start with, end with, or contain the value, e.g. [href*=/path/]
• [attr=~regex]: elements that have the attribute key, that its value matches the supplied regular expression; e.g. img[src~=(?i)\.(png|jpe?g)]
• *: all elements, e.g. *

Selector combinations

• el#id: elements with ID, e.g. div#logo
• el.class: elements with class, e.g. div.masthead
• el[attr]: elements with attribute, e.g. a[href]
• Any combination, e.g. a[href].highlight
• ancestor child: child elements that descend from ancestor, e.g. .body p finds p elements anywhere under a block with class "body"
• parent > child: child elements that descend directly from parent, e.g. div.content > p finds p elements; and body > * finds the direct children of the body tag
• siblingA + siblingB: finds sibling B element immediately preceded by sibling A, e.g. div.head + div
• siblingA ~ siblingX: finds sibling X element preceded by sibling A, e.g. h1 ~ p
• el, el, el: group multiple selectors, find unique elements that match any of the selectors; e.g. div.masthead, div.logo

Pseudo selectors

• el:lt(n): find elements whose sibling index (i.e. its position in the DOM tree relative to its parent) is less than n; e.g. td:lt(3)
• el:gt(n): find elements whose sibling index is greater than n; e.g. div p:gt(2)
• el:eq(n): find elements whose sibling index is equal to n; e.g. form input:eq(1)
• el:has(seletor): find elements that contain elements matching the selector; e.g. div:has(p)
• el:contains(text): find elements that contain the given text. The search is case-insensitive; e.g. p:contains(jsoup)
• el:matches(regex): find elements whose text matches the specified regular expression; e.g. div:matches((?i)login).
• Note that all of the above indexed pseudo-selectors are 0-based, that is, the first element is at index 0, the second at 1, etc.

相当之强大，比我一直在用的 htmlparser 强多了。