lucene 学习一

 

索引工具的三部分

　　1.索引部分

　　2.分词部分

　　3.搜索部分

 

查看索引的工具：luke   java -jar fileName.jar

 

目标：为文件夹的所有的文档生成索引并搜索它

package com.lucene;import java.io.File;
import java.io.FileReader;
import java.io.IOException;import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.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.store.LockObtainFailedException;
import org.apache.lucene.util.Version;// lucene 使用的版本为 3.5
public class HelloLucene {public static void main(String[] args) {HelloLucene hl = new HelloLucene();hl.index();hl.search();}/*** 建立文档索引*/public void index() {IndexWriter writer = null;try {//1.创建Director(确定索引建立的位置)
//            Directory directory = new RAMDirectory(); //在内存中建立Directory directory = FSDirectory.open(new File("d:/index_01"));//2.通过 IndexWriter 写索引IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_35, new StandardAnalyzer(Version.LUCENE_35));writer = new IndexWriter(directory, iwc);//3.创建 Document 对象Document doc = null;File f = new File("G:/lucene/");for(File file : f.listFiles()){//4.为文档 添加Field （文档的每个属性比如名称可以称之为文档的一个Field）doc = new  Document();doc.add(new Field("content", new FileReader(file)));doc.add(new Field("filename", file.getName(), Field.Store.YES, Field.Index.ANALYZED_NO_NORMS));doc.add(new Field("path", file.getAbsolutePath(), Field.Store.YES, Field.Index.ANALYZED_NO_NORMS));//5.通过IndexWrite添加文档到索引中
                writer.addDocument(doc);// 在索引库没有建立并且没有索引文件的时候首先要commit一下让他建立一个 索引库的版本信息  
                writer.commit();}} catch (CorruptIndexException e) {e.printStackTrace();} catch (LockObtainFailedException e) {e.printStackTrace();} catch (IOException e) {try {if(writer != null) writer.close();} catch (CorruptIndexException e1) {e1.printStackTrace();} catch (IOException e1) {e1.printStackTrace();}e.printStackTrace();}}/*** 搜索*/public void search(){try {//1.创建DirectoryDirectory directory = FSDirectory.open(new File("d:/index_01"));//2.创建IndexReaderIndexReader reader = IndexReader.open(directory);//3.根据IndexReader创建IndexSearcherIndexSearcher searcher = new IndexSearcher(reader);//4.创建搜索的的QueryQueryParser parser = new QueryParser(Version.LUCENE_35, "content", new StandardAnalyzer(Version.LUCENE_35));//要搜索的内容Query query = parser.parse("document");//5.根据searcher搜索并返回TopDocsTopDocs tds = searcher.search(query, 100);//6.根据TopDocs获取scoreDocs对象ScoreDoc[] sds = tds.scoreDocs;for(ScoreDoc sd:sds){//7.根据Search和ScoreDoc对象获取具体的Document对象Document  d = searcher.doc(sd.doc);//8.根据document对象获取需要的值                System.out.println(d.get("filename")+"|"+d.get("path"));}System.out.println(sds.length);    } catch (IOException e) {// TODO Auto-generated catch block
            e.printStackTrace();} catch (ParseException e) {// TODO Auto-generated catch block
            e.printStackTrace();}//2.
    }}