Home Web Front-end HTML Tutorial Java解析和遍历html文档利器_html/css_WEB-ITnose

Java解析和遍历html文档利器_html/css_WEB-ITnose

Jun 24, 2016 am 11:20 AM

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>
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隐式标签  <td>Table data</td>包装成<table><tr><td>
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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)
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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();
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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();
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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/");
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简单的从String加载HTML

Document doc = Jsoup.parse(String html);
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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
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常用的方法:见官网API文档传送Jsoup

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