Lucene 学习(一):简单demo
lucene java 全文检索    2017-07-19 20:51:52    4   
lightingfire   lucene java 全文检索
Lucene是apache软件基金会4 jakarta项目组的一个子项目,是一个开放源代码的全文检索引擎工具包,但它不是一个完整的全文检索引擎,而是一个全文检索引擎的架构,提供了完整的查询引擎和索引引擎,部分文本分析引擎(英文与德文两种西方语言)。Lucene的目的是为软件开发人员提供一个简单易用的工具包,以方便的在目标系统中实现全文检索的功能,或者是以此为基础建立起完整的全文检索引擎。Lucene是一套用于全文检索和搜寻的开源程式库,由Apache软件基金会支持和提供。Lucene提供了一个简单却强大的应用程式接口,能够做全文索引和搜寻。在Java开发环境里Lucene是一个成熟的免费开源工具。就其本身而言,Lucene是当前以及最近几年最受欢迎的免费Java信息检索程序库。人们经常提到信息检索程序库,虽然与搜索引擎有关,但不应该将信息检索程序库与搜索引擎相混淆。(摘自:http://baike.baidu.com/link?url=YfcwwNXbNFaYkMNZqNhk9LIyHdrSuIMsMLlO_NNm3ioxHADGUid2JnF1R9znysICj6w83zJmlpZPBJnv1mHYFK


下面是全文检索引擎的初步应用,但是很遗憾,原生的lucene不支持中文分词,所以需要插件支持,在后面会继续讲到。


代码摘自:http://iluoxuan.iteye.com/blog/1708695


POM.xml文件:

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>cn.firewarm</groupId>
    <artifactId>testLucene</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>testLucene Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <repositories>
        <repository>
            <id>mine</id>
            <name>public Releases</name>
            <layout>default</layout>
            <url>http://nexus.liuyingguang.cn:8081/nexus/content/groups/public/</url>
        </repository>
    </repositories>
    <dependencies>
        <dependency>
            <groupId>org.apache.lucene</groupId>
            <artifactId>lucene-core</artifactId>
            <version>4.10.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.lucene</groupId>
            <artifactId>lucene-analyzers-common</artifactId>
            <version>4.10.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.lucene</groupId>
            <artifactId>lucene-queryparser</artifactId>
            <version>4.10.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-vfs2</artifactId>
            <version>2.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>testLucene</finalName>
    </build>
</project>

创建索引的代码如下:

package com.search.lucene;

import java.io.File;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import org.junit.Before;
import org.junit.Test;

public class IndexFile {

    protected String[] ids={"1", "2"};

    protected String[] content={"Amsterdam has lost of add  cancals", "i love  add this girl"};

    protected String[] city={"Amsterdam", "Venice"};

    private Directory dir;

    /**
     * 初始添加文档
     * @throws Exception
     */
    @Test
    public void init() throws Exception {
        String pathFile="D://lucene/index";
        dir=FSDirectory.open(new File(pathFile));
        IndexWriter writer=getWriter();
        for(int i=0; i < ids.length; i++) {
            Document doc=new Document();
            doc.add(new StringField("id", ids[i], Store.YES));
            doc.add(new TextField("content", content[i], Store.YES));
            doc.add(new StringField("city", city[i], Store.YES));
            writer.addDocument(doc);
        }
        System.out.println("init ok?");
        writer.close();
    }

    /**
     * 获得IndexWriter对象
     * @return
     * @throws Exception
     */
    public IndexWriter getWriter() throws Exception {
        Analyzer analyzer=new StandardAnalyzer(Version.LUCENE_40);
        IndexWriterConfig iwc=new IndexWriterConfig(Version.LUCENE_40, analyzer);
        return new IndexWriter(dir, iwc);
    }

}


查询代码如下:

package com.search.lucene;

import java.io.File;

import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.junit.Test;

public class IndexSearch {

    /**
     * 查询
     * @throws Exception
     */
    @Test
    public void search() throws Exception {
        String filePath="D://lucene/index";
        Directory dir=FSDirectory.open(new File(filePath));
        IndexReader reader=DirectoryReader.open(dir);
        IndexSearcher searcher=new IndexSearcher(reader);
        Term term=new Term("content", "add");
        TermQuery query=new TermQuery(term);
        TopDocs topdocs=searcher.search(query, 5);
        ScoreDoc[] scoreDocs=topdocs.scoreDocs;
        System.out.println("查询结果总数---" + topdocs.totalHits+"最大的评分--"+topdocs.getMaxScore());
        for(int i=0; i < scoreDocs.length; i++) {
            int doc = scoreDocs[i].doc;
            Document document = searcher.doc(doc);
            System.out.println("content===="+document.get("content"));
            System.out.println("id--" + scoreDocs[i].doc + "---scors--" + scoreDocs[i].score+"---index--"+scoreDocs[i].shardIndex);
        }
        reader.close();
    }
}

 

by 刘迎光@萤火虫工作室 
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