HtmlCleaner XPath API使用

阅读更多

HtmlCleaner是使用Java编写的HTML解析开源组件。网络上的HTML一般是比较杂乱的，难以进一步处理，需要大量的时间去剔除无效的内容，按照顺序整理tag，attribute等。HtmlCleaner能够将任意的HTML格式化为XML。HtmlCleaner会同浏览器一样默认的创建DOM(Document Object Model)。不论怎样，都需要自定义tag筛选策略和调整方式。

 

HtmlCleaner可以配置相应的参数（http://htmlcleaner.sourceforge.net/parameters.php），可以在在Java代码中定义，如：

 

HtmlCleaner cleaner = 
    new HtmlCleaner( new ConfigFileTagProvider(myConfigFile) );

 

 

也可以在命令行中定义，如：

 

java -jar htmlcleanerXX.jar [src = ] [incharset = ] 
                                [dest = ] [outcharset = ] 
                                [taginfofile = ] [options...]

 

 

可以通过http://htmlcleaner.sourceforge.net/javause.php，查看基本的用法。

 

既然HtmlCleaner在内部将HTML组织成XML，那么使用XPath也是理所当然的。作为例子，抓取“豆瓣电影TOP250”

 

package org.htmlcleaner;

import java.net.URL;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Reymont.Li
 * @DateTime 2015年8月17日 下午6:36:26
 */
public class DoubanTest {
	// http://movie.douban.com/top250
	// http://movie.douban.com/top250?start=200&filter=&type=
	// http://movie.douban.com/top250?start=225&filter=&type=
	public static void main(String[] args) throws Exception {

		HtmlCleaner cleaner = new HtmlCleaner();

		String urlAddr = "http://movie.douban.com/top250";

		List names = new ArrayList();
		List stars = new ArrayList();
		List remarks = new ArrayList();

		for (int i = 0; i <= 10; i++) {
			TagNode root = cleaner.clean(new URL(urlAddr + "?start=" + i * 25));

			Object[] nameArray = root.evaluateXPath("//div[@class='info']//a/span[1]");
			for (Object nameNode : nameArray) {
				String name = nameNode instanceof TagNode ? ((TagNode) nameNode).getText().toString()
						: nameNode.toString();
				names.add(name.trim());
			}
			Object[] starArray = root.evaluateXPath("//div[@class='info']//em");
			for (Object starNode : starArray) {
				String star = starNode instanceof TagNode ? ((TagNode) starNode).getText().toString()
						: starNode.toString();
				stars.add(star.trim());
			}
			Object[] remarkArray = root.evaluateXPath("//div[@class='info']//div[@class='star']/span[2]");
			for (Object remarkNode : remarkArray) {
				String remark = remarkNode instanceof TagNode ? ((TagNode) remarkNode).getText().toString()
						: remarkNode.toString();
				remarks.add(remark.trim());
			}
		}

		for (int i = 0; i < names.size(); i++) {
			System.out.println(
					(i + 1) + "\t name:" + names.get(i) + "\t\t star:" + stars.get(i) + "\t remark:" + remarks.get(i));
		}
	}
}

 

 

参考：

HtmlCleaner Project Home Page

http://htmlcleaner.sourceforge.net/javause.php

htmlcleaner使用及xpath语法初探 - reesun的专栏 - 博客频道 - CSDN.NET

http://blog.csdn.net/reesun/article/details/8021201

Java - XPath解析爬取内容 - 推酷

http://www.tuicool.com/articles/Uzmmue

Java 语言的 XPath API

http://www.ibm.com/developerworks/cn/xml/x-javaxpathapi.html