Java操作Html文档利器---Jsoup
jopen
12年前
一、Jsoup是虾米东西了?这个不解释,给你列个场景你就知道,比喻你现在想通过java代码从www.baidu.com上获取百度icom的url,怎么办了?就必须得对html文档元素进行操作了。对!!Jsoup就是java中用来操作html文档的一个第三方类库。
二、Why Jsoup?用过Jquery的都知道,Jquery简单的语法超强的功能,让人用了就爱不释手,而Jsoup的用法就是使用类Jquery的用法,所以会jQuery的话,稍微看一下文档就会使用Jsoup了。
三、具体应用
上面罗里吧嗦的简单介绍了一下jsoup,现在简单介绍一下在生产环境中的具体应用。小弟最近遇到的一个需求是通过iTunesId到苹果的网站上去获取这个应用的Icon和描述图片。具体的思路是:
1、从Jsoup的官方网站下载jsoup的jar,最新的版本为1.6.3,并且这个包是无依赖包,不需要和其他的jar包配合使用
2、加载文档
3、查找icon元素获取的地址
4、获取描述图片的元素并取得地址
业务并不复杂,贴一下代码,注释还算清楚。
package com.akwolf.quartz; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.apache.log4j.Logger; import org.jdom.CDATA; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import org.jsoup.select.Elements; import org.quartz.Job; import org.quartz.JobExecutionContext; import org.quartz.JobExecutionException; public class AppleJob implements Job { private static Logger logger = Logger.getLogger(AppleJob.class); public static void main(String[] args) { AppleJob aj = new AppleJob(); try { String itunesId = "444934666"; try { Document doc = aj.getHtmlDoc(itunesId); logger.debug("itunesId : " + itunesId + " , doc : "); // 如果不是一个有效的链接 if (doc == null || !aj.isCorrectItunesId(doc)) { throw new IOException(); } String params = aj.getProParameter(aj.getIconUrl(doc), aj.getDescImgUrl(doc)); logger.debug("params : " + params); } catch (IOException e) { logger.warn("Can't connect to : " + itunesId); } } catch (Exception e) { e.printStackTrace(); logger.warn("Has some Exception!!!"); } } @Override public void execute(JobExecutionContext jec) throws JobExecutionException { try { String itunesId = "444934666"; try { Document doc = this.getHtmlDoc(itunesId); logger.debug("itunesId : " + itunesId + " , doc : "); // 如果不是一个有效的链接 if (doc == null || !isCorrectItunesId(doc)) { throw new IOException(); } String params = this.getProParameter(this.getIconUrl(doc), this.getDescImgUrl(doc)); logger.debug("params : " + params); } catch (IOException e) { logger.warn("Can't connect to : " + itunesId); } } catch (Exception e) { e.printStackTrace(); logger.warn("Has some Exception!!!"); JobExecutionException jee = new JobExecutionException(e); jee.refireImmediately(); } } /** * * 判断是否是一个有效的连接 * * @param doc * @return */ private boolean isCorrectItunesId(Document doc) { Elements footer = doc.select("p.footer"); if (footer == null || footer.size() == 0) { return true; } return (!"http://www.apple.com.cn/itunes/download/".equals(footer .first().select("a").first().absUrl("href"))); } /** * @param iconUrl * @param descImgUrl * @return * @throws IOException * * * 拼装出存储过程的参数 */ private String getProParameter(String iconUrl, List<String> descImgUrl) throws IOException { StringBuffer buffer = new StringBuffer(); org.jdom.Element root = new org.jdom.Element("params"); org.jdom.Document doc = new org.jdom.Document(root); org.jdom.Element icon = new org.jdom.Element("IconUrl"); org.jdom.Element desc = new org.jdom.Element("DescUrl"); ByteArrayOutputStream out = new ByteArrayOutputStream(); for (int i = 0; i < descImgUrl.size(); i++) { if (i == descImgUrl.size() - 1) { buffer.append(descImgUrl.get(i)); } else { buffer.append(descImgUrl.get(i)).append(","); } } icon.addContent(new CDATA(iconUrl)); desc.addContent(new CDATA(buffer.toString())); root.addContent(icon).addContent(desc); Format format = Format.getRawFormat(); format.setOmitDeclaration(true); XMLOutputter writer = new XMLOutputter(format); writer.output(doc, out); return out.toString(); } /** * @param itunesId * @return * @throws IOException * * 取得html文档 */ private Document getHtmlDoc(String itunesId) throws IOException { Document doc = Jsoup.connect( "http://itunes.apple.com/cn/app/id" + itunesId).get(); return doc; } /** * @param doc * @return * * 解析出app的icon图片 */ private String getIconUrl(Document doc) { Element img = doc.select("#left-stack").first().select("img").first(); String src = img.attr("abs:src"); return src; } /** * @param doc * @return * * 解析出描述图片的url */ private List<String> getDescImgUrl(Document doc) { List<String> list = new ArrayList<String>(); Elements wrapper = doc.select("div.center-stack").first() .select("img.portrait"); for (Element element : wrapper) { list.add(element.attr("abs:src")); } return list; } }结果
26 [main] DEBUG com.akwolf.quartz.AppleJob (2012-09-23 10:50:12,136) - params : <params><IconUrl><![CDATA[http://a3.mzstatic.com/us/r1000/104/Purple/v4/bb/71/3a/bb713a76-5492-9456-5114-63c19582b3c3/mza_297600500225037689.175x175-75.jpg]]></IconUrl><DescUrl><![CDATA[http://a5.mzstatic.com/us/r1000/080/Purple/v4/05/d6/d9/05d6d9d0-686f-63ad-7713-34b5b5aaea7f/mza_2616996279428462004.320x480-75.jpg,http://a2.mzstatic.com/us/r1000/067/Purple/v4/4d/9e/97/4d9e97ea-8367-764d-fceb-e607f55bf847/mza_7946357603060756898.320x480-75.jpg,http://a2.mzstatic.com/us/r1000/071/Purple/v4/21/7a/45/217a4551-d1b1-27e5-3a15-dec47a136069/mza_6366124751766881957.320x480-75.jpg,http://a5.mzstatic.com/us/r1000/065/Purple/v4/7b/5b/ad/7b5badf9-73ba-dd72-4dc9-95a671aa1306/mza_7359786108776115754.320x480-75.jpg,http://a4.mzstatic.com/us/r1000/112/Purple/v4/b7/19/25/b71925c1-a2a7-c69d-fd9c-d3368d0fb1b5/mza_8201700535726140806.320x480-75.jpg]]></DescUrl></params>来自:http://blog.csdn.net/akwolf/article/details/8009226