neo4j自定義中文分詞器

新建maven項目

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://maven.apache.org/POM/4.0.0"
         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>
    <packaging>jar</packaging>
    <groupId>com.gtja</groupId>
    <artifactId>gtja-analyzer</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <neo4j.version>4.0.5</neo4j.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.neo4j</groupId>
            <artifactId>neo4j</artifactId>
            <version>${neo4j.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.ansj</groupId>
            <artifactId>ansj_seg</artifactId>
            <version>5.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.ansj</groupId>
            <artifactId>ansj_lucene7_plug</artifactId>
            <version>5.1.5.2</version>
        </dependency>

    </dependencies>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>11</source>
                    <target>11</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-shade-plugin</artifactId>
                <configuration>
                    <createDependencyReducedPom>false</createDependencyReducedPom>
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <transformers>
                                <transformer
                                        implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

編寫核心類

package org.neo4j.kernel.api.impl.fulltext.analyzer.providers;

import org.ansj.lucene7.AnsjAnalyzer;
import org.apache.lucene.analysis.Analyzer;
import org.neo4j.graphdb.schema.AnalyzerProvider;

public class AnsjAnalyzerProvider extends AnalyzerProvider {

    public AnsjAnalyzerProvider() {
        super("ansj");
    }

    @Override
    public String description() {
        return "中文索引工具";
    }

    public Analyzer createAnalyzer() {
        return new AnsjAnalyzer(AnsjAnalyzer.TYPE.index_ansj);
    }

}

• 自定義分詞器必須繼承AnalyzerProvider 接口.
• 該類必須有默認的構造方法,使用開發工具在糾錯的時候生成的構造方法可能是是protected.這樣會導致插件安裝失敗,需要注意
• 注意使用的分詞器中依賴的lucene和neo4j中依賴的Lucene,要避免版本衝突.

配置加載服務

新建resources/META-INF/services/目錄,創建文件org.neo4j.graphdb.schema.AnalyzerProvider,內容:

org.neo4j.kernel.api.impl.fulltext.analyzer.providers.AnsjAnalyzerProvider

打包到插件目錄

執行 mvn package生成jar文件,複製該文件到neo4j的plugin目錄下面,然後重啓neo4j服務.

執行下面的命令查看插件是否安裝正確:

call db.index.fulltext.listAvailableAnalyzers

如果結果集中出現我們定義的分詞器的名稱,則安裝成功.