简单实现lucence搜索

一：pom.xml

    <!-- lucene -->
    <dependency>
        <groupId>org.apache.lucene</groupId>
        <artifactId>lucene-core</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.lucene</groupId>
        <artifactId>lucene-queryparser</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.lucene</groupId>
        <artifactId>lucene-analyzers-common</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.lucene</groupId>
        <artifactId>lucene-analyzers-smartcn</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.lucene</groupId>
        <artifactId>lucene-highlighter</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.9</version>
    </dependency>  

二：创建索引，Indexer.java

package com.lucene;
import java.nio.file.Paths;
import org.apache.lucene.analysis.cn.smart.SmartChineseAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.IntField;
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;
public class Indexer {
    private Integer ids[] = {1,2,3};
    private String citys[] = {"青岛","南京","上海"};
    private String descs[] = {
            "青岛是一个美丽的城市。",
            "南京是一个有文化的城市。南京是一个文化的城市南京，简称宁，是江苏省会，地处中国东部地区，长江下游，濒江近海。全市下辖11个区，" +
            "总面积6597平方公里，2013年建成区面积752.83平方公里，常住人口818.78万，其中城镇人口659.1万人。[1-4] “江南佳丽地，金陵帝王州”，" +
            "南京拥有着6000多年文明史、近2600年建城史和近500年的建都史，是中国四大古都之一，有“六朝古都”、“十朝都会”之称，是中华文明的重要发祥地，" +
            "历史上曾数次庇佑华夏之正朔，长期是中国南方的政治、经济、文化中心，拥有厚重的文化底蕴和丰富的历史遗存。[5-7] 南京是国家重要的科教中心，" +
            "自古以来就是一座崇文重教的城市，有“天下文枢”、“东南第一学”的美誉。截至2013年，南京有高等院校75所，其中211高校8所，仅次于北京上海；" +
            "国家重点实验室25所、国家重点学科169个、两院院士83人，均居中国第三。[8-10] 。",
            "上海是一个繁华的城市。"
    };
    
    private Directory dir;
    
    /**
     * 获取IndexWriter实例
     * @return
     * @throws Exception
     */
    private IndexWriter getWriter()throws Exception{
        //Analyzer analyzer  =  new StandardAnalyzer(); // 标准分词器
        SmartChineseAnalyzer analyzer = new SmartChineseAnalyzer();
        IndexWriterConfig iwc = new IndexWriterConfig(analyzer);
        IndexWriter writer = new IndexWriter(dir, iwc);
        return writer;
    }
    
    /**
     * 生成索引
     * @param indexDir
     * @throws Exception
     */
    private void index(String indexDir)throws Exception{
        dir = FSDirectory.open(Paths.get(indexDir));
        IndexWriter writer = getWriter();
        for(int i = 0;i<ids.length;i++){
            Document doc = new Document();
            doc.add(new IntField("id", ids[i], Field.Store.YES));
            doc.add(new StringField("city",citys[i],Field.Store.YES));
            doc.add(new TextField("desc", descs[i], Field.Store.YES));
            writer.addDocument(doc); // 添加文档
        }
        writer.close();
    }
    public static void main(String[] args) throws Exception {
        new Indexer().index("F:\\data");
    }
}

三：搜索，Lucence01.java

package com.lucene;
import java.io.StringReader;
import java.nio.file.Paths;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.cn.smart.SmartChineseAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.highlight.Fragmenter;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
import org.apache.lucene.search.highlight.SimpleSpanFragmenter;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
public class Lucene01{
    public static void search(String indexDir,String q)throws Exception{
        Directory dir = FSDirectory.open(Paths.get(indexDir));
        IndexReader reader = DirectoryReader.open(dir);
        IndexSearcher is = new IndexSearcher(reader);
        // Analyzer analyzer = new StandardAnalyzer(); // 标准分词器
        SmartChineseAnalyzer analyzer = new SmartChineseAnalyzer();
        QueryParser parser = new QueryParser("desc", analyzer);
        Query query = parser.parse(q);
        long start = System.currentTimeMillis();
        TopDocs hits = is.search(query, 10);
        long end = System.currentTimeMillis();
        System.out.println("匹配 "+q+" ，总共花费"+(end-start)+"毫秒"+"查询到"+hits.totalHits+"个记录");
        
        QueryScorer scorer = new QueryScorer(query);
        Fragmenter fragmenter = new SimpleSpanFragmenter(scorer);
        SimpleHTMLFormatter simpleHTMLFormatter = new SimpleHTMLFormatter("<b><font color = 'red'>","</font></b>");
        Highlighter highlighter = new Highlighter(simpleHTMLFormatter, scorer);
        highlighter.setTextFragmenter(fragmenter);
        for(ScoreDoc scoreDoc:hits.scoreDocs){
            Document doc = is.doc(scoreDoc.doc);
            System.out.println(doc.get("city"));
            System.out.println(doc.get("desc"));
            String desc = doc.get("desc");
            if(desc != null){
                TokenStream tokenStream = analyzer.tokenStream("desc", new StringReader(desc));
                System.out.println(highlighter.getBestFragment(tokenStream, desc));
            }
        }
        reader.close();
    }
    
    public static void main(String[] args) {
        String indexDir = "F:\\data";
        String q = "南京文明是个美丽的城市";
        try {
            search(indexDir,q);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}