原文出处:http://blog.chenlb.com/2008/11/htmlcleaner-use-demo.html
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>
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。