HTMLCleaner 的使用心得.

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做项目的时候，有时数据源从html来。那就要对html分析提取数据。好在java社区里有好有相关库来解析html，经使用比较：个人觉得 htmlcleaner 比 htmlparser 好用。htmlcleaner 的 xpath特好用。也可能我对htmlparser不熟悉。

htmlcleaner 下载地址：htmlcleaner2_1.jar 源码下载：htmlcleaner2_1-all.zip

写一个测试用的html文件：html-clean-demo.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" dir="ltr"> <head> <meta http-equiv="Content-Type" content="text/html; charset=GBK"/> <meta http-equiv="Content-Language" content="zh-CN"/> <title>html clean demo</title> </head> <body> <div class="d_1"> <ul> <li>bar</li> <li>foo</li> <li>gzz</li> </ul> </div> <div> <ul> <li><a name="my_href" href="1.html" mce_href="1.html">text-1</a></li> <li><a name="my_href" href="2.html" mce_href="2.html">text-2</a></li> <li><a name="my_href" href="3.html" mce_href="3.html">text-3</a></li> <li><a name="my_href" href="4.html" mce_href="4.html">text-4</a></li> </ul> </div> </body> </html>

模拟需求：取出title，name="my_href" 的链接，div的class="d_1"下的所有li内容。下面用htmlcleaner写代码，HtmlCleanerDemo.java

package com.chenlb; import java.io.File; import org.htmlcleaner.HtmlCleaner; import org.htmlcleaner.TagNode; /** * htmlcleaner 使用示例. * * @author chenlb 2008-11-26 下午02:12:02 */ public class HtmlCleanerDemo { public static void main(String[] args) throws Exception { HtmlCleaner cleaner = new HtmlCleaner(); TagNode node = cleaner.clean(new File( "html/html-clean-demo.html" ), "GBK" ); //按tag取. Object[] ns = node.getElementsByName("title" , true ); //标题 if (ns.length > 0 ) { System.out.println("title=" +((TagNode)ns[ 0 ]).getText()); } System.out.println("ul/li:" ); //按xpath取 ns = node.evaluateXPath("//div[@class='d_1']//li" ); for (Object on : ns) { TagNode n = (TagNode) on; System.out.println("/ttext=" +n.getText()); } System.out.println("a:" ); //按属性值取 ns = node.getElementsByAttValue("name" , "my_href" , true , true ); for (Object on : ns) { TagNode n = (TagNode) on; System.out.println("/thref=" +n.getAttributeByName( "href" )+ ", text=" +n.getText()); } } }

cleaner.clean()中的参数，可以是文件，可以是url，可以是字符串内容。个人认为：比较常用的应该是evaluateXPath、 getElementsByAttValue、getElementsByName方法了。另外说明下，htmlcleaner 对不规范的html兼容性比较好。