Java解析和遍历html文档利器_html/css_WEB-ITnose
前言:几乎任何的语言都可以解析和遍历html超文本,我常用的语言就是php啦,但是我想在android客户端获取网络http的的数据,虽然可以使用php但是需要二次连接和php环境,然而就直接使用java语言去搞,那么不可能直接用java原生语言去码的啦,使用Jsoup去解析,Jsoup是java语言一款不错的html解析文档的利器!
Jsoup的简介Jsoup是java语言一款不错的html解析和遍历文档的利器。
Jsoup的优点其解析器能够尽最大可能从你提供的HTML文档来创见一个干净的解析结果,无论HTML的格式是否完整。比如它可以处理:
没有关闭的标签 <p>Lorem <p>Ipsum parses to <p>Lorem</p> <p>Ipsum</p>
隐式标签 <td>Table data</td>包装成<table><tr><td>
创建可靠的文档结构(html标签包含head 和 body,在head只出现恰当的元素)
Jsoup常用的方法从一个URL加载一个Document
简单的get方法Document doc = Jsoup.connect("http://www.domain.com/").get();String title = doc.title();
带头信息的post方法Document doc = Jsoup.connect("http://www..domain.com") .data("username", "Alic") .userAgent("Mozilla") .cookie("auth", "token") .timeout(3000) .post();
从文件中加载HTML文档
File file = new File("path");Document doc = Jsoup.parse(file, "UTF-8", "http://www.domian.com/");
简单的从String加载HTML
Document doc = Jsoup.parse(String html);
使用DOM方法来遍历一个文档
File file = new File("/path/index.html");Document doc = Jsoup.parse(file, "UTF-8", "http://www.domian.com/");Element content = doc.getElementById("content");//获取id为content的dom节点Elements links = content.getElementsByTag("a");//获取所有的a标签dom节点//遍历所有的a标签for (Element link : links) { String linkHref = link.attr("href"); String linkText = link.text();}Elements links = doc.select("a[href]"); //带有href属性的a元素Elements pngs = doc.select("img[src$=.png]"); //扩展名为.png的图片Element masthead = doc.select("div.masthead").first(); //class等于masthead的div标签Elements resultLinks = doc.select("h3.r > a"); //在h3元素之后的a元素
常用的方法:见官网API文档传送Jsoup

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