编译Ansj之Solr插件
Ansj是一个比较优秀的中文分词组件，具体情况就不在本文介绍了。ansj作者在其官方代码中，提供了对lucene接口的支持。如果用在Solr下，还需要简单的扩展一下。
1、基于maven管理
ansj是基于maven进行开发管理的。我们首先修改一下其pom.xml，具体如下所示：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.ansj</groupId>
<artifactId>MavenAccount-aggregator</artifactId>
<version>0.0.1</version>
<relativePath>../pom.xml</relativePath>
</parent>
<artifactId>ansj_lucene4_plug</artifactId>
<version>2.0.2</version>
<packaging>jar</packaging>
<name>ansj_lucene4_plug</name>
<properties>
<solr.version>4.8.0</solr.version>
</properties>
<dependencies>
<dependency>
<groupId>org.ansj</groupId>
<artifactId>ansj_seg</artifactId>
<version>2.0.5</version>
<classifier>min</classifier>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-core</artifactId>
<version>${solr.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-highlighter</artifactId>
<version>${solr.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-queries</artifactId>
<version>${solr.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-queryparser</artifactId>
<version>${solr.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.solr</groupId>
<artifactId>solr-dataimporthandler</artifactId>
<version>${solr.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.4</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
其中，代码依赖的配置项：<scope>provided</scope> 表示只用于代码编译阶段。依赖关系整理好以后，写一个TokenizerFactory类，用于solr中配置使用，代码如下：
package org.ansj.solr;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.ansj.lucene.util.AnsjTokenizer;
import org.ansj.splitWord.analysis.IndexAnalysis;
import org.ansj.splitWord.analysis.ToAnalysis;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.util.TokenizerFactory;
import org.apache.lucene.util.AttributeSource.AttributeFactory;
public class AnsjTokenizerFactory extends TokenizerFactory{
boolean pstemming;
boolean isQuery;
private String stopwordsDir;
public Set<String> filter;
public AnsjTokenizerFactory(Map<String, String> args) {
super(args);
assureMatchVersion();
isQuery = getBoolean(args, "isQuery", true);
pstemming = getBoolean(args, "pstemming", false);
stopwordsDir = get(args,"words");
addStopwords(stopwordsDir);
}
//add stopwords list to filter
private void addStopwords(String dir) {
if (dir == null){
System.out.println("no stopwords dir");
return;
}
//read stoplist
System.out.println("stopwords: " + dir);
filter = new HashSet<String>();
File file = new File(dir);
InputStreamReader reader;
try {
reader = new InputStreamReader(new FileInputStream(file),"UTF-8");
BufferedReader br = new BufferedReader(reader);
String word = br.readLine();
while (word != null) {
filter.add(word);
word = br.readLine();
}
} catch (FileNotFoundException e) {
System.out.println("No stopword file found");
} catch (IOException e) {
System.out.println("stopword file io exception");
}
}
@Override
public Tokenizer create(AttributeFactory factory, Reader input) {
if(isQuery == true){
//query
return new AnsjTokenizer(new ToAnalysis(new BufferedReader(input)), input, filter, pstemming);
} else {
//index
return new AnsjTokenizer(new IndexAnalysis(new BufferedReader(input)), input, filter, pstemming);
}
}
}
pstemming 参数是ansj需要的参数。
isQuery 是用于判断是查询还是索引，一般搜索index阶段分词比较细，查询的分词比较粗。
2、编译jar包。
代码结构如下：
编写mavn编译命令：mvn install -DskipTests=true# 忽略单元测试编译。
执行编译：
[INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building ansj_lucene4_plug 2.0.2 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ ansj_lucene4_plug --- [INFO] Deleting R:\ansj-seg\ansj_seg\plug\ansj_lucene4_plug\target [INFO] [INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ ansj_lucene4_plug --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory R:\ansj-seg\ansj_seg\plug\ansj_lucene4_plug\src\main\resources [INFO] [INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ ansj_lucene4_plug --- [INFO] Compiling 5 source files to R:\ansj-seg\ansj_seg\plug\ansj_lucene4_plug\target\classes [INFO] [INFO] --- maven-resources-plugin:2.4.3:testResources (default-testResources) @ ansj_lucene4_plug --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory R:\ansj-seg\ansj_seg\plug\ansj_lucene4_plug\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:2.3.2:testCompile (default-testCompile) @ ansj_lucene4_plug --- [INFO] Compiling 3 source files to R:\ansj-seg\ansj_seg\plug\ansj_lucene4_plug\target\test-classes [INFO] [INFO] --- maven-surefire-plugin:2.7.1:test (default-test) @ ansj_lucene4_plug --- [INFO] Tests are skipped. [INFO] [INFO] --- maven-jar-plugin:2.3.1:jar (default-jar) @ ansj_lucene4_plug --- [INFO] Building jar: R:\ansj-seg\ansj_seg\plug\ansj_lucene4_plug\target\ansj_lucene4_plug-2.0.2.jar [INFO] [INFO] --- maven-install-plugin:2.3.1:install (default-install) @ ansj_lucene4_plug --- [INFO] Installing R:\ansj-seg\ansj_seg\plug\ansj_lucene4_plug\target\ansj_lucene4_plug-2.0.2.jar to C:\Users\GCZX-016\.m2\repository\org\ansj\ansj_lucene4_plug\2.0.2\ansj_lucene4_plug-2.0.2.jar [INFO] Installing R:\ansj-seg\ansj_seg\plug\ansj_lucene4_plug\pom.xml to C:\Users\GCZX-016\.m2\repository\org\ansj\ansj_lucene4_plug\2.0.2\ansj_lucene4_plug-2.0.2.pom [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 8.149s [INFO] Finished at: Tue May 05 15:29:19 CST 2015 [INFO] Final Memory: 27M/245M [INFO] ------------------------------------------------------------------------
