[lucene系列笔记2]在eclipse里初步使用lucene的索引和查询功能

import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.io.*;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
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;

/**
 * @author song
 * @description: 
 * 依赖jar：Lucene-core，lucene-analyzers-common，lucene-queryparser
 * 作用：简单的索引建立
 */
public class IndexFiles {
    public static Version luceneVersion = Version.LATEST;
    /**
     * 建立索引
     */
    public static void createIndex(){
        IndexWriter writer = null;
        try{
            //1、创建Directory
            //Directory directory = new RAMDirectory();//创建内存directory
            Directory directory = FSDirectory.open(Paths.get("D:/lucenetest/index"));//在硬盘上生成Directory00
            //2、创建IndexWriter
            IndexWriterConfig iwCOnfig= new IndexWriterConfig( new StandardAnalyzer());
            writer = new IndexWriter(directory, iwConfig);
            //3、创建document对象
            Document document = null;
            //4、为document添加field对象
            File f = new File("D:/lucenetest/files");//索引源文件位置
            for (File file:f.listFiles()){
                    document = new Document();
                    document.add(new StringField("path", f.getName(),Field.Store.YES));
                    System.out.println(file.getName());
                    document.add(new StringField("name", file.getName(),Field.Store.YES));
                    InputStream stream = Files.newInputStream(Paths.get(file.toString()));
                    document.add(new TextField("content", new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))));//textField内容会进行分词
                    //document.add(new TextField("content", new FileReader(file)));  如果不用utf-8编码的话直接用这个就可以了
                    writer.addDocument(document);
            }
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            //6、使用完成后需要将writer进行关闭
            try {
                writer.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    public static void main(String[] args) throws IOException
    {
        createIndex();
    }
}

import java.nio.file.Paths;
import java.io.*;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
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.apache.lucene.util.Version;

/**
 * @author song
 * @description: 
 * 依赖jar：Lucene-core，lucene-analyzers-common，lucene-queryparser
 * 作用：使用索引搜索文件
 */
public class SearchFiles {
    public static Version luceneVersion = Version.LATEST;
    /**
     * 查询内容
     */
    public static String indexSearch(String keywords){
        String res = "";
        DirectoryReader reader = null;
        try{
//            1、创建Directory
             Directory directory = FSDirectory.open(Paths.get("D:/lucenetest/index"));//在硬盘上生成Directory
//            2、创建IndexReader
             reader = DirectoryReader.open(directory);
//            3、根据IndexWriter创建IndexSearcher
             IndexSearcher searcher =  new IndexSearcher(reader);
//            4、创建搜索的query
//            创建parse用来确定搜索的内容，第二个参数表示搜索的域
             QueryParser parser = new QueryParser("content",new StandardAnalyzer());//content表示搜索的域或者说字段
             Query query = parser.parse(keywords);//被搜索的内容
//            5、根据Searcher返回TopDocs
             TopDocs tds = searcher.search(query, 20);//查询20条记录
//            6、根据TopDocs获取ScoreDoc
             ScoreDoc[] sds = tds.scoreDocs;
//            7、根据Searcher和ScoreDoc获取搜索到的document对象
             int cou=0;
             for(ScoreDoc sd:sds){
                 cou++;
                 Document d = searcher.doc(sd.doc);
//                    8、根据document对象获取查询的字段值
                 /**  查询结果中content为空，是因为索引中没有存储content的内容，需要根据索引path和name从原文件中获取content**/
                 res+=cou+". "+d.get("path")+" "+d.get("name")+" "+d.get("content")+"\n";
             }

            
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            //9、关闭reader
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return res;
    }
    public static void main(String[] args) throws IOException
    {
        System.out.println(indexSearch("你好")); //搜索的内容可以修改
    }
}