使用Lucene的java api 写入和读取索引库

import org.apache.commons.io.FileUtils;import org.apache.lucene.analysis.standard.StandardAnalyzer;import org.apache.lucene.document.Document;import org.apache.lucene.document.Field;import org.apache.lucene.document.NumericDocValuesField;import org.apache.lucene.document.TextField;import org.apache.lucene.index.DirectoryReader;import org.apache.lucene.index.IndexReader;import org.apache.lucene.index.IndexWriter;import org.apache.lucene.index.IndexWriterConfig;import org.apache.lucene.queryparser.classic.ParseException;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.store.Directory;import org.apache.lucene.store.FSDirectory;import org.junit.Test;

import java.io.File;import java.io.IOException;import java.nio.file.Path;import java.nio.file.Paths;

public class Day01 {    public String dataDir="E:\\data";    //2.search检索    @Test    public void search() throws IOException, ParseException {      //01.        Path path=Paths.get("./luceneindex/");        Directory directory=FSDirectory.open(path);        IndexReader indexReader=DirectoryReader.open(directory);        //索引查询工具        IndexSearcher indexSearcher=new IndexSearcher(indexReader);        String word="战斗";        QueryParser queryParser=new QueryParser("filename",new StandardAnalyzer());        Query query=queryParser.parse(word);        TopDocs topDocs = indexSearcher.search(query, 10);

long count = topDocs.totalHits;        System.out.println("总记录数："+count);

ScoreDoc[] scoreDocs = topDocs.scoreDocs;        for (ScoreDoc item:scoreDocs) {            int docid = item.doc; //文档编号            Document document = indexReader.document(docid);            String filename = document.get("filename");            System.out.println(filename);        }    }    @Test    //1.创建索引    public void createIndex() throws IOException {      //01.准备一个写入索引的目录       Path path = Paths.get("./luceneindex/");       //02.将路径与Directory进行绑定        Directory directory=FSDirectory.open(path);        //03.这行code在底层默认已经关联绑定了一个StandardAnalyzer 标准分词器        IndexWriterConfig config=new IndexWriterConfig();        //04.给config设置一个模式  Create:每次都抹掉原来的索引文件，重新构建新的索引文件        config.setOpenMode(IndexWriterConfig.OpenMode.CREATE);        //05.索引写入器需要两个入参，一个是目录，另一个是配置        IndexWriter writer=new IndexWriter(directory,config);        //06.准备加入索引库的内容        File file = new File(dataDir);        //07.某个目录下的文件集合        File[] files = file.listFiles();        for (File item:files) {            //08.将内容幻化成----->Document            Document document=new Document();            String filename=item.getName(); //file--->String            System.out.println(filename);            System.out.println("===============================");            String filecontent=FileUtils.readFileToString(item);            Long modifydate=item.lastModified();            //09.真正的给Document的field赋值            document.add(new TextField("filename",filename,Field.Store.YES));            document.add(new TextField("filecontent",filecontent,Field.Store.YES));            document.add(new NumericDocValuesField("modifydate",modifydate));            //10.将单个Document(一条记录)  保存到  索引库中            writer.addDocument(document);        }        //11.关闭索引库        writer.close();        System.out.println("add indexes ok!");    }}

原文地址：https://www.cnblogs.com/bdqnjs/p/9425455.html