htmlcleaner 使用示例.
htmlcleaner 使用示例.
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
?? 1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">?
?? 2. <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" dir="ltr">?
?? 3. <head>?
?? 4.???? <meta http-equiv="Content-Type" content="text/html; charset=GBK"/>?
?? 5.???? <meta http-equiv="Content-Language" content="zh-CN"/>?
?? 6.???? <title>html clean demo</title>?
?? 7. </head>?
?? 8. <body>?
?? 9. <div href="1.html">text-1</a></li>?
? 19.???????? <li><a name="my_href" href="2.html">text-2</a></li>?
? 20.???????? <li><a name="my_href" href="3.html">text-3</a></li>?
? 21.???????? <li><a name="my_href" href="4.html">text-4</a></li>?
? 22.???? </ul>?
? 23. </div>?
? 24. </body>?
? 25. </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。
