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Nutch1.2增加插件例子

ApacheluceneHadoopAntXML 
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今尝试下给nutch1.2增加一个插件，于是到官网找了个例子，链接如下：

http://wiki.apache.org/nutch/WritingPluginExample-0.9

这个例子实现的的是推荐网站，就是写关键字在content里，当别人搜索这个关键字时，你推荐的网站在搜索结果中排前，要实现推荐必须在你的网页上加上

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<meta name="recommended" content="plugins" />
<meta name="recommended" content="plugins" />

这条属性才能被插件识别。

由于它这个例子是用nutch0.9的，而且1.2和0.9有些区别，于是要修改一些代码。步骤如下：

1.插件开放

1.1在src/plugin中新建一个文件夹recommend

1.2.在recommend目录下新建Plugin.xml和Build.xml文件，内容如下：

Plugin.xml

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<?xml version="1.0" encoding="UTF-8"?>
<plugin
id="recommended"
name="Recommended Parser/Filter"
version="0.0.1"
provider-name="nutch.org">

<runtime>
<!-- As defined in build.xml this plugin will end up bundled as recommended.jar -->
<library name="recommended.jar">
<export name="*"/>
</library>
</runtime>

<!-- The RecommendedParser extends the HtmlParseFilter to grab the contents of
any recommended meta tags -->
<extension id="org.apache.nutch.parse.recommended.recommendedfilter"
name="Recommended Parser"
point="org.apache.nutch.parse.HtmlParseFilter">
<implementation id="RecommendedParser"
class="org.apache.nutch.parse.recommended.RecommendedParser"/>
</extension>

<!-- TheRecommendedIndexer extends the IndexingFilter in order to add the contents
of the recommended meta tags (as found by the RecommendedParser) to the lucene
index. -->
<extension id="org.apache.nutch.parse.recommended.recommendedindexer"
name="Recommended identifier filter"
point="org.apache.nutch.indexer.IndexingFilter">
<implementation id="RecommendedIndexer"
class="org.apache.nutch.parse.recommended.RecommendedIndexer"/>
</extension>

<!-- The RecommendedQueryFilter gets called when you perform a search. It runs a
search for the user's query against the recommended fields. In order to get
add this to the list of filters that gets run by default, you have to use
"fields=DEFAULT". -->
<extension id="org.apache.nutch.parse.recommended.recommendedSearcher"
name="Recommended Search Query Filter"
point="org.apache.nutch.searcher.QueryFilter">
<implementation id="RecommendedQueryFilter"
class="org.apache.nutch.parse.recommended.RecommendedQueryFilter">
<parameter name="fields" value="recommended"/>
</implementation>
</extension>

</plugin>
<?xml version="1.0" encoding="UTF-8"?>
<plugin
id="recommended"
name="Recommended Parser/Filter"
version="0.0.1"
provider-name="nutch.org">

<runtime>
<!-- As defined in build.xml this plugin will end up bundled as recommended.jar -->
<library name="recommended.jar">
<export name="*"/>
</library>
</runtime>

<!-- The RecommendedParser extends the HtmlParseFilter to grab the contents of
any recommended meta tags -->
<extension id="org.apache.nutch.parse.recommended.recommendedfilter"
name="Recommended Parser"
point="org.apache.nutch.parse.HtmlParseFilter">
<implementation id="RecommendedParser"
class="org.apache.nutch.parse.recommended.RecommendedParser"/>
</extension>

<!-- TheRecommendedIndexer extends the IndexingFilter in order to add the contents
of the recommended meta tags (as found by the RecommendedParser) to the lucene
index. -->
<extension id="org.apache.nutch.parse.recommended.recommendedindexer"
name="Recommended identifier filter"
point="org.apache.nutch.indexer.IndexingFilter">
<implementation id="RecommendedIndexer"
class="org.apache.nutch.parse.recommended.RecommendedIndexer"/>
</extension>

<!-- The RecommendedQueryFilter gets called when you perform a search. It runs a
search for the user's query against the recommended fields. In order to get
add this to the list of filters that gets run by default, you have to use
"fields=DEFAULT". -->
<extension id="org.apache.nutch.parse.recommended.recommendedSearcher"
name="Recommended Search Query Filter"
point="org.apache.nutch.searcher.QueryFilter">
<implementation id="RecommendedQueryFilter"
class="org.apache.nutch.parse.recommended.RecommendedQueryFilter">
<parameter name="fields" value="recommended"/>
</implementation>
</extension>

</plugin>

Build.xml

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<?xml version="1.0"?>

<project name="recommended" default="jar-core">

<import file="../build-plugin.xml"/>

<!-- Build compilation dependencies -->
<target name="deps-jar">
<ant target="jar" inheritall="false" dir="../lib-xml"/>
</target>

<!-- Add compilation dependencies to classpath -->
<path id="plugin.deps">
<fileset dir="${nutch.root}/build">
<include name="**/lib-xml/*.jar" />
</fileset>
</path>

<!-- Deploy Unit test dependencies -->
<target name="deps-test">
<ant target="deploy" inheritall="false" dir="../lib-xml"/>
<ant target="deploy" inheritall="false" dir="../nutch-extensionpoints"/>
<ant target="deploy" inheritall="false" dir="../protocol-file"/>
</target>


<!-- for junit test -->
<mkdir dir="${build.test}/data"/>
<copy file="data/recommended.html" todir="${build.test}/data"/>
</project>
<?xml version="1.0"?>

<project name="recommended" default="jar-core">

<import file="../build-plugin.xml"/>

<!-- Build compilation dependencies -->
<target name="deps-jar">
<ant target="jar" inheritall="false" dir="../lib-xml"/>
</target>

<!-- Add compilation dependencies to classpath -->
<path id="plugin.deps">
<fileset dir="${nutch.root}/build">
<include name="**/lib-xml/*.jar" />
</fileset>
</path>

<!-- Deploy Unit test dependencies -->
<target name="deps-test">
<ant target="deploy" inheritall="false" dir="../lib-xml"/>
<ant target="deploy" inheritall="false" dir="../nutch-extensionpoints"/>
<ant target="deploy" inheritall="false" dir="../protocol-file"/>
</target>


<!-- for junit test -->
<mkdir dir="${build.test}/data"/>
<copy file="data/recommended.html" todir="${build.test}/data"/>
</project>

1.3.在recommended目录下建立\src\java\org\apache\nutch\parse\recommended目录。

1.4.增加RecommendedIndexer.java,RecommendedParser.java,RecommendedQueryFilter.java三个类，内容如下：

RecommendedIndexer.java

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package org.apache.nutch.parse.recommended;

// JDK import
import java.util.logging.Logger;

// Commons imports
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


// Nutch imports
import org.apache.nutch.util.LogUtil;
import org.apache.nutch.fetcher.FetcherOutput;
import org.apache.nutch.indexer.IndexingFilter;
import org.apache.nutch.indexer.IndexingException;
import org.apache.nutch.indexer.NutchDocument;
import org.apache.nutch.parse.Parse;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.Inlinks;

// Lucene imports
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Document;

public class RecommendedIndexer implements IndexingFilter {

public static final Log LOG = LogFactory.getLog(RecommendedIndexer.class.getName());

private Configuration conf;

public RecommendedIndexer() {
}
@Override
public NutchDocument filter(NutchDocument doc, Parse parse, Text url,
CrawlDatum datum, Inlinks inlinks)
throws IndexingException {

String recommendation = parse.getData().getMeta("recommended");

if (recommendation != null) {
Field recommendedField =
new Field("recommended", recommendation,
Field.Store.YES, Field.Index.NOT_ANALYZED);
recommendedField.setBoost(5.0f);
doc.add("recommended",recommendedField);
LOG.info("Added " + recommendation + " to the recommended Field");
}

return doc;
}

public void setConf(Configuration conf) {
this.conf = conf;
}

public Configuration getConf() {
return this.conf;
}

@Override
public void addIndexBackendOptions(Configuration conf) {
// TODO Auto-generated method stub
}
}
package org.apache.nutch.parse.recommended;

// JDK import
import java.util.logging.Logger;

// Commons imports
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


// Nutch imports
import org.apache.nutch.util.LogUtil;
import org.apache.nutch.fetcher.FetcherOutput;
import org.apache.nutch.indexer.IndexingFilter;
import org.apache.nutch.indexer.IndexingException;
import org.apache.nutch.indexer.NutchDocument;
import org.apache.nutch.parse.Parse;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.Inlinks;

// Lucene imports
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Document;

public class RecommendedIndexer implements IndexingFilter {

public static final Log LOG = LogFactory.getLog(RecommendedIndexer.class.getName());

private Configuration conf;

public RecommendedIndexer() {
}
@Override
public NutchDocument filter(NutchDocument doc, Parse parse, Text url,
CrawlDatum datum, Inlinks inlinks)
throws IndexingException {

String recommendation = parse.getData().getMeta("recommended");

if (recommendation != null) {
Field recommendedField =
new Field("recommended", recommendation,
Field.Store.YES, Field.Index.NOT_ANALYZED);
recommendedField.setBoost(5.0f);
doc.add("recommended",recommendedField);
LOG.info("Added " + recommendation + " to the recommended Field");
}

return doc;
}

public void setConf(Configuration conf) {
this.conf = conf;
}

public Configuration getConf() {
return this.conf;
}

@Override
public void addIndexBackendOptions(Configuration conf) {
// TODO Auto-generated method stub
}
}

RecommendedParser.java

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package org.apache.nutch.parse.recommended;

// JDK imports
import java.util.Enumeration;
import java.util.Properties;
import java.util.logging.Logger;

// Nutch imports
import org.apache.hadoop.conf.Configuration;
import org.apache.nutch.metadata.Metadata;
import org.apache.nutch.parse.HTMLMetaTags;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.parse.HtmlParseFilter;
import org.apache.nutch.parse.ParseResult;
import org.apache.nutch.protocol.Content;

// Commons imports
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

// W3C imports
import org.w3c.dom.DocumentFragment;

public class RecommendedParser implements HtmlParseFilter {

private static final Log LOG = LogFactory.getLog(RecommendedParser.class.getName());

private Configuration conf;

/** The Recommended meta data attribute name */
public static final String META_RECOMMENDED_NAME="recommended";

/**
* Scan the HTML document looking for a recommended meta tag.
*/

@Override
public ParseResult filter(Content content, ParseResult parseResult,
HTMLMetaTags metaTags, DocumentFragment doc) {
// Trying to find the document's recommended term
String recommendation = null;

Properties generalMetaTags = metaTags.getGeneralTags();

for (Enumeration tagNames = generalMetaTags.propertyNames(); tagNames.hasMoreElements(); ) {
if (tagNames.nextElement().equals("recommended")) {
System.out.println(generalMetaTags.getProperty("recommended"));
recommendation = generalMetaTags.getProperty("recommended");
LOG.info("Found a Recommendation for " + recommendation);
}
}

if (recommendation == null) {
LOG.info("No Recommendation");
} else {
LOG.info("Adding Recommendation for " + recommendation);
Parse parse = parseResult.get(content.getUrl());

parse.getData().getContentMeta().set(META_RECOMMENDED_NAME, recommendation);
}

return parseResult;
}

public void setConf(Configuration conf) {
this.conf = conf;
}

public Configuration getConf() {
return this.conf;
}



}
package org.apache.nutch.parse.recommended;

// JDK imports
import java.util.Enumeration;
import java.util.Properties;
import java.util.logging.Logger;

// Nutch imports
import org.apache.hadoop.conf.Configuration;
import org.apache.nutch.metadata.Metadata;
import org.apache.nutch.parse.HTMLMetaTags;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.parse.HtmlParseFilter;
import org.apache.nutch.parse.ParseResult;
import org.apache.nutch.protocol.Content;

// Commons imports
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

// W3C imports
import org.w3c.dom.DocumentFragment;

public class RecommendedParser implements HtmlParseFilter {

private static final Log LOG = LogFactory.getLog(RecommendedParser.class.getName());

private Configuration conf;

/** The Recommended meta data attribute name */
public static final String META_RECOMMENDED_NAME="recommended";

/**
* Scan the HTML document looking for a recommended meta tag.
*/

@Override
public ParseResult filter(Content content, ParseResult parseResult,
HTMLMetaTags metaTags, DocumentFragment doc) {
// Trying to find the document's recommended term
String recommendation = null;

Properties generalMetaTags = metaTags.getGeneralTags();

for (Enumeration tagNames = generalMetaTags.propertyNames(); tagNames.hasMoreElements(); ) {
if (tagNames.nextElement().equals("recommended")) {
System.out.println(generalMetaTags.getProperty("recommended"));
recommendation = generalMetaTags.getProperty("recommended");
LOG.info("Found a Recommendation for " + recommendation);
}
}

if (recommendation == null) {
LOG.info("No Recommendation");
} else {
LOG.info("Adding Recommendation for " + recommendation);
Parse parse = parseResult.get(content.getUrl());

parse.getData().getContentMeta().set(META_RECOMMENDED_NAME, recommendation);
}

return parseResult;
}

public void setConf(Configuration conf) {
this.conf = conf;
}

public Configuration getConf() {
return this.conf;
}

}

RecommendedQueryFilter.java

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package org.apache.nutch.parse.recommended;

import org.apache.nutch.searcher.FieldQueryFilter;

import java.util.logging.Logger;

// Commons imports
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


public class RecommendedQueryFilter extends FieldQueryFilter {
private static final Log LOG = LogFactory.getLog(RecommendedParser.class.getName());

public RecommendedQueryFilter() {
super("recommended", 5f);
LOG.info("Added a recommended query");
}

}
package org.apache.nutch.parse.recommended;

import org.apache.nutch.searcher.FieldQueryFilter;

import java.util.logging.Logger;

// Commons imports
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


public class RecommendedQueryFilter extends FieldQueryFilter {
private static final Log LOG = LogFactory.getLog(RecommendedParser.class.getName());

public RecommendedQueryFilter() {
super("recommended", 5f);
LOG.info("Added a recommended query");
}

}

1.5.在 src/plugin/build.xml 中的<target name="deploy"></target>中增加一行：

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<ant dir="recommended" target="deploy" />
<ant dir="recommended" target="deploy" />

1.6.运行cmd，切换到recommend目录，运行ant命令编译，插件开发完成。

1.7 让nutch识别你的插件

在conf/nutch-site.xml 中增加一下属性

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<property>
<name>plugin.includes</name>
<value>recommended|protocol-http|urlfilter-regex|parse-(text|html|js)|index-basic|query-(basic|site|url)|summary-basic|scoring-opic|urlnormalizer-(pass|regex|basic)</value> <description>Regular expression naming plugin id names to
include. Any plugin not matching this expression is excluded.
In any case you need at least include the nutch-extensionpoints plugin. By
default Nutch includes crawling just HTML and plain text via HTTP,
and basic indexing and search plugins.
</description>
</property>
<property>
<name>plugin.includes</name>
<value>recommended|protocol-http|urlfilter-regex|parse-(text|html|js)|index-basic|query-(basic|site|url)|summary-basic|scoring-opic|urlnormalizer-(pass|regex|basic)</value> <description>Regular expression naming plugin id names to
include. Any plugin not matching this expression is excluded.
In any case you need at least include the nutch-extensionpoints plugin. By
default Nutch includes crawling just HTML and plain text via HTTP,
and basic indexing and search plugins.
</description>
</property>

2.编写插件测试类

2.1 在src/plugin中/recommend目录下新建一个data目录，在data目录下新建一个html文件recommended.html内容如下：

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">

<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>recommended</title>
<meta name="generator" content="TextMate http://macromates.com/ ">
<meta name="author" content="Ricardo J. Méndez">
<meta name="recommended" content="recommended-content"/>
<!-- Date: 2007-02-12 -->
</head>
<body>
Recommended meta tag test.
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">

<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>recommended</title>
<meta name="generator" content="TextMate http://macromates.com/ ">
<meta name="author" content="Ricardo J. Méndez">
<meta name="recommended" content="recommended-content"/>
<!-- Date: 2007-02-12 -->
</head>
<body>
Recommended meta tag test.
</body>
</html>

2.2 在src/plugin中/recommend目录下新建src/test/org/apache/nutch/parse/recommended目录，增加TestRecommendedParser.java类，内容如下：

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package org.apache.nutch.parse.recommended;


import org.apache.nutch.metadata.Metadata;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.parse.ParseResult;
import org.apache.nutch.parse.ParseUtil;
import org.apache.nutch.protocol.Content;
import org.apache.hadoop.conf.Configuration;
import org.apache.nutch.util.NutchConfiguration;

import java.util.Properties;
import java.io.*;
import java.net.URL;

import junit.framework.TestCase;

/*
* Loads test page recommended.html and verifies that the recommended
* meta tag has recommended-content as its value.
*
*/
public class TestRecommendedParser extends TestCase {

private static final File testDir =
new File("H:/project/SearchEngine/Nutch1.2/src/plugin/recommended/data");

public void testPages() throws Exception {
pageTest(new File(testDir, "recommended.html"), "http://foo.com/ ",
"recommended-content");

}


public void pageTest(File file, String url, String recommendation)
throws Exception {

String contentType = "text/html";
InputStream in = new FileInputStream(file);

ByteArrayOutputStream out = new ByteArrayOutputStream((int)file.length());
byte[] buffer = new byte[1024];
int i;
while ((i = in.read(buffer)) != -1) {
out.write(buffer, 0, i);
}
in.close();
byte[] bytes = out.toByteArray();
Configuration conf = NutchConfiguration.create();

Content content =
new Content(url, url, bytes, contentType, new Metadata(), conf);

Parse parse = new ParseUtil(conf).parseByExtensionId("parse-html",content).get(content.getUrl());

Metadata metadata = parse.getData().getContentMeta();

assertEquals(recommendation, metadata.get("recommended"));
assertTrue("somesillycontent" != metadata.get("recommended"));
}

}
package org.apache.nutch.parse.recommended;


import org.apache.nutch.metadata.Metadata;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.parse.ParseResult;
import org.apache.nutch.parse.ParseUtil;
import org.apache.nutch.protocol.Content;
import org.apache.hadoop.conf.Configuration;
import org.apache.nutch.util.NutchConfiguration;

import java.util.Properties;
import java.io.*;
import java.net.URL;

import junit.framework.TestCase;

/*
* Loads test page recommended.html and verifies that the recommended
* meta tag has recommended-content as its value.
*
*/
public class TestRecommendedParser extends TestCase {

private static final File testDir =
new File("H:/project/SearchEngine/Nutch1.2/src/plugin/recommended/data");

public void testPages() throws Exception {
pageTest(new File(testDir, "recommended.html"), "http://foo.com/ ",
"recommended-content");

}


public void pageTest(File file, String url, String recommendation)
throws Exception {

String contentType = "text/html";
InputStream in = new FileInputStream(file);

ByteArrayOutputStream out = new ByteArrayOutputStream((int)file.length());
byte[] buffer = new byte[1024];
int i;
while ((i = in.read(buffer)) != -1) {
out.write(buffer, 0, i);
}
in.close();
byte[] bytes = out.toByteArray();
Configuration conf = NutchConfiguration.create();

Content content =
new Content(url, url, bytes, contentType, new Metadata(), conf);

Parse parse = new ParseUtil(conf).parseByExtensionId("parse-html",content).get(content.getUrl());

Metadata metadata = parse.getData().getContentMeta();

assertEquals(recommendation, metadata.get("recommended"));
assertTrue("somesillycontent" != metadata.get("recommended"));
}

}

2.3 用junit运行TestRecommendedParser.java测试。

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