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解析和遍曆一個HTML文檔如何解析一個HTML文檔：
String html = "<html><head><title>First parse</title></head>" + "<body><p>Parsed HTML into a doc.</p></body></html>";Document doc = Jsoup.parse(html);(更詳細內容可查看 解析一個HTML字串.)
其解析器能夠盡最大可能從你提供的HTML文檔來創見一個乾淨的解析結果，無論HTML的格式是否完整。比如它可以處理：
<p>Lorem <p>Ipsum parses to <p>Lorem</p> <p>Ipsum</p>)<td>Table data</td>封裝成<table><tr><td>?)Document繼承Element繼承Node. TextNode繼承 Node.你有一個HTML文檔,你想從中提取資料。而且你知道一般的HTML文檔的結構。可用類似dom方法解析HTML文檔。
1 /** 2 * 擷取htmlElement元素 3 * @author bling 4 * @throws IOException 5 * @create Date:2014-07-13 6 */ 7 @Test 8 public void getDataElement() throws IOException{ 9 File input = new File("tmp/input.html");10 Document doc = Jsoup.parse(input, "UTF-8", "http://example.com/");11 12 Element content = doc.getElementById("content");13 Elements links = content.getElementsByTag("a");14 for(Element link : links){15 String linkHref = link.attr("href");16 String linkText = link.text();17 System.out.println("linkHref:"+linkHref+"------"+"linkText:"+linkText);18 }19 }
Elements 提供類似尋找Element的方法，並可提取操作資料，DOM對象為上下文：根據父親Document尋找匹配之下的document，並根據找到的document尋找其下的孩子項目，使用這種方式可尋找你想要的資料。
getElementById(String id)getElementsByTag(String tag)getElementsByClass(String className)getElementsByAttribute(String key) (and related methods)siblingElements(), firstElementSibling(), lastElementSibling();nextElementSibling(), previousElementSibling()parent(), children(), child(int index)attr(String key) to get and attr(String key, String value) to set attributesattributes() to get all attributesid(), className() and classNames()text() to get and text(String value) to set the text contenthtml() to get and html(String value) to set the inner HTML contentouterHtml() to get the outer HTML valuedata() to get data content (e.g. of script and style tags)tag() and tagName()append(String html), prepend(String html)appendText(String text), prependText(String text)appendElement(String tagName), prependElement(String tagName)html(String value)GitHub例子代碼：https://github.com/Java-Group-Bling/Jsoup-learn
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