简易的搜索引擎搭建
我的配置:
Nutch:1.2
Tomcat:7.0.57
1 Nutch设置
修改Nutch配置
1.1 修改conf/nutch-site.xml
1 <?xml version="1.0"?> 2 <?xml-stylesheet type="text/xsl" href="configuration.xsl"?> 3 4 <!-- Put site-specific property overrides in this file. --> 5 6 <configuration> 7 8 <!--property> 9 <name>storage.data.store.class</name> 10 <value>org.apache.gora.hbase.store.HBaseStore</value> 11 <description>Default class for storing data</description> 12 </property> 13 <property> 14 <name>http.agent.name</name> 15 <value>xxx0624-ThinkPad-Edge</value> 16 </property--> 17 18 <property> 19 <name>http.agent.name</name> 20 <value>nutch1.0</value> 21 </property> 22 23 <property> 24 <name>plugin.folders</name> 25 <value>./plugins</value> 26 </property> 27 28 </configuration>
1.2 修改conf/crawl-urlfilter.txt
1 # accept hosts in MY.DOMAIN.NAME 2 +^http://([a-z0-9]*\.)*sohu.com/
找到该处进行修改。我的是以sohu网为例。表示只爬取sohu.com结尾的网页。
1.3 增加文件夹
在nutch目录下mkdir一个新的文件夹 名字为urls,再在里面建立一个空的txt文件 名字为urls.txt。
在urls.txt中写入要爬取的网页地址:如http://www.sohu.com/
1.4 开始爬取
命令:
bin/nutch crawl urls/urls.txt -dir crawled -depth 5 -threads 5 -topN 200
crawled指爬取网页的结果的存储位置,当爬取结束时,会自动生成5个文件夹:crawldb,index,indexes,linkdb,segments
2 tomcat设置
2.1 将nutch编译后的war包放在tomcat的webapps下,再启动tomcat,再在生成的nutch1.2文件夹下修改WEB-INF/classes/nutch-sites.xml
<property>
<name>searcher.dir</name>
<value>/home/xxx0624/nutch-1.2/crawled</value>
</property>
这是设置抓取网页信息的文件位置
2.2 针对中文乱码修改
2.2.1 修改tomcat配置文件conf/server.xml
1 <Connector port="8080" protocol="HTTP/1.1" 2 connectionTimeout="20000" 3 redirectPort="8443" 4 URIEncoding="UTF-8" 5 useBodyEncodingForURI="true"/>
增加其中的URIEncoding和useBodyEncodingForURI
2.2.2 修改nutch-1.2/cache.jsp
找到这一部分
1 Metadata metaData = bean.getParseData(details).getContentMeta(); 2 ParseData ParseData = bean.getParseData(details); 3 String content = null; 4 // String contentType = (String) metaData.get(Metadata.CONTENT_TYPE); 5 String contentType = ParseData.getMeta(Metadata.CONTENT_TYPE); 6 if (contentType.startsWith("text/html")) { 7 // FIXME : it's better to emit the original 'byte' sequence 8 // with 'charset' set to the value of 'CharEncoding', 9 // but I don't know how to emit 'byte sequence' in JSP. 10 // out.getOutputStream().write(bean.getContent(details)) may work, 11 // but I'm not sure. 12 //String encoding = (String) metaData.get("CharEncodingForConversion"); 13 String encoding = ParseData.getMeta("CharEncodingForConversion"); 14 if (encoding != null) { 15 try { 16 content = new String(bean.getContent(details), encoding); 17 } 18 catch (UnsupportedEncodingException e) { 19 // fallback to windows-1252 20 content = new String(bean.getContent(details), "windows-1252"); 21 } 22 } 23 else 24 content = new String(bean.getContent(details),"GBK"); 25 //content = new String(bean.getContent(details));
3 开始实验
重启tomcat
通过浏览器访问:http://localhost:8080/nutch-1.2