HTMLParser入门_02_网络爬虫的雏形_解析文章的主题和作者及关键字等信息
package com.jadyer.httpclient;import java.io.FileInputStream;import java.io.FileOutputStream;import java.util.List;import org.apache.commons.io.IOUtils;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import org.htmlparser.Node;import org.htmlparser.NodeFilter;import org.htmlparser.Parser;import org.htmlparser.tags.Div;import org.htmlparser.tags.LinkTag;import org.htmlparser.tags.MetaTag;import org.htmlparser.util.NodeList;/** * HTMLParser入门_02_网络爬虫的雏形_解析文章的主题和作者及关键字等信息 * @see --------------------------------------------------------------------- * @see 所有jar如下 * @see commons-io-2.3.jar * @see commons-codec-1.6.jar(以下7个jar取自HttpClient官网下载的httpcomponents-client-4.2.1-bin.zip) * @see commons-logging-1.1.1.jar * @see fluent-hc-4.2.1.jar * @see httpclient-4.2.1.jar * @see httpclient-cache-4.2.1.jar * @see httpcore-4.2.1.jar * @see httpmime-4.2.1.jar * @see filterbuilder.jar(以下5个jar取自HTMLParser官网下载的HTMLParser-2.0-SNAPSHOT-bin.zip) * @see htmllexer.jar * @see htmlparser.jar * @see sitecapturer.jar * @see thumbelina.jar * @see --------------------------------------------------------------------- * @see 本文所用的HTMLParser工具类,详见我的下面的这一篇文章 * @see http://blog.csdn.net/jadyer/article/details/8656479 * @see --------------------------------------------------------------------- * @create Mar 10, 2013 5:05:55 PM * @author 玄玉<http://blog.csdn/net/jadyer> */public class SpiderDemo {private static final String articleURI = "http://www.ibm.com/developerworks/cn/java/j-javaroundtable/index.html";private static final String localHTML = "D:/Download/localHTML.html";/** * 下载文章 */private static void downloadArticle() throws Exception {HttpClient httpClient = new DefaultHttpClient();HttpGet httpGet = new HttpGet(articleURI);try {HttpResponse response = httpClient.execute(httpGet);HttpEntity entity = response.getEntity();if(null != entity){String responseContent = EntityUtils.toString(entity, "UTF-8");EntityUtils.consume(entity);//文章内容写到本地(IOUtils干完活儿会自动关闭IO流)IOUtils.write(responseContent, new FileOutputStream(localHTML), "UTF-8");}}finally{httpClient.getConnectionManager().shutdown();}}/** * 解析具有某种特征的标签 */@SuppressWarnings("serial")private static void parseSpecifiedTag() throws Exception{String inputHTML = IOUtils.toString(new FileInputStream(localHTML), "UTF-8");Parser parser = new Parser();parser.setInputHTML(inputHTML);//提取name="title"的<meta>标签,符合条件的应该只有一个<meta>标签,所以这里用单数//这里我们自己写一个Filter,并且用内部类的方式NodeList metaTag = parser.parse(new NodeFilter(){@Overridepublic boolean accept(Node node) {//找到<meta>标签if(node instanceof MetaTag){MetaTag mt = (MetaTag)node;//找到<meta name="title">的标签if(null!=mt.getMetaTagName() && "title".equals(mt.getMetaTagName())){return true;}}return false;}});//提取<meta name="title" content="2010 年春 Java 平台圆桌会议"/>标签中的content属性值System.out.println("name=title,content=" + ((MetaTag)metaTag.elementAt(0)).getMetaContent());}/** * 解析文章的简介,关键字,作者姓名等信息 */private static void parseAbstractAndKeywords() throws Exception{String html = IOUtils.toString(new FileInputStream(localHTML), "UTF-8");List<MetaTag> metaTags = HTMLParseUtil.parseTags(html, MetaTag.class, "name", "Abstract");for(MetaTag mt : metaTags){System.out.println("文章的简介:" + mt.getMetaContent());}MetaTag mt = HTMLParseUtil.parseTag(html, MetaTag.class, "name", "Keywords");System.out.println("文章关键字:" + mt.getMetaContent());List<Div> divTags = HTMLParseUtil.parseTags(html, Div.class, "class", "author");for(Div div : divTags){//div.getStringText()可以得到<div></div>所嵌套的内容LinkTag aTag = HTMLParseUtil.parseTag(div.getStringText(), LinkTag.class, "class", "dwauthor");System.out.println("作者姓名:" + aTag.getStringText());}}}