日期:2014-05-17 浏览次数:20629 次
package com.jadyer.httpclient; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import org.apache.commons.io.FileUtils; import org.apache.commons.io.FilenameUtils; import org.apache.commons.io.IOUtils; import org.apache.commons.lang.StringUtils; 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.filters.NodeClassFilter; import org.htmlparser.nodes.TagNode; import org.htmlparser.nodes.TextNode; import org.htmlparser.tags.ImageTag; import org.htmlparser.util.NodeList; /** * HTMLParser入门_01_网络爬虫的雏形_解析文章和处理文章中的图片 * @see --------------------------------------------------------------------- * @see 所有jar如下 * @see commons-io-2.3.jar * @see commons-land-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 网络爬虫的雏形 * @see 通过本文的三个方法,就可以初步实现一个网络爬虫 * @see 比如有个后台管理系统,可添加待爬虫的技术文章,输入参数为文章URL,输出参数为文章中的实际内容 * @see 并且它还会下载文章内容中的图片,并修改内容中的图片URL为本地的绝对路径,使得文章图片正常显示 * @see 接下来就是在前台显示文章了,至于怎么显示,随心所欲喽.. * @see 至于如何获取文章标题,作者,关键字,总体描述等信息,可参考我的下面这一篇文章 * @see http://blog.csdn.net/jadyer/article/details/8656477 * @see --------------------------------------------------------------------- * @create Mar 10, 2013 4:05:55 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(); } } /** * 下载文章内容中的图片到本地 */ private static void downloadArticleImage() throws Exception { //加载文章整理 String html = IOUtils.toString(new FileInputStream(localHTML), "UTF-8"); //获取文章内容,这里是通过分析文章<body>中的特征来获取内容的 String article = StringUtils.substringBetween(html, "<!-- MAIN_COLUMN_CONTENT_BEGIN -->", "<!-- CMA"); System.out.println("文章内容:" + article); Parser parser = new Parser(); parser.setInputHTML(article); //提取所有的<img>标签 //这里使用了内置的NodeClassFilter,它会根据节点类型来过滤,这里过滤的是ImageTag节点类型 NodeList imageTags = parser.parse(new NodeClassFilter(ImageTag.class)); for(int i=0; i<imageTags.size(); i++){ ImageTag it = (ImageTag)imageTags.elementAt(i); //it.getImageURL()即<img>中的src属性值 System.out.println("图片链接:" + it.getImageURL()); //合成图片的绝对路径http://www.ibm.com/developerworks/cn/java/j-javaroundtable/ + it.getImageURL() String absoluteURL = articleURI.substring(0, articleURI.lastIndexOf("/")+1) + it.getImageURL(); System.out.println(