htmlcleaner 使用示例.

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编程的时候，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" > text-1 </ a > </ li >
< li > < a name = "my_href" href = "2.html" > text-2 </ a > </ li >
< li > < a name = "my_href" href = "3.html" > text-3 </ a > </ li >
< li > < a name = "my_href" href = "4.html" > text-4 </ a > </ li >
</ ul >
</ div >
</ body >
</ 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">text-1</a></li>
		<li><a name="my_href" href="2.html">text-2</a></li>
		<li><a name="my_href" href="3.html">text-3</a></li>
		<li><a name="my_href" 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());
}
}
}

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。

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htmlcleaner惯用法 | UML用例图中包含、扩展和泛化三种关系详解

2010-04-13 13:10
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