在全文搜索工具中由三部分组成，索引部分，分词部分，搜索部分。

下面案例简单介绍：

首先创建索引，然后通过索引进行查找：

package org.itat.test;
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.store.RAMDirectory;
import org.apache.lucene.util.Version;
public class HelloLucene {/*** 创建索引*/public void index() {Directory directory = null;IndexWriterConfig iwc = null;IndexWriter iw = null;try {// 1!创建DIRECTORY// Directory directory=new RAMDirectory();directory = FSDirectory.open(new File("E:/lucenetext"));// 2!创建INDEXWRITERiwc = new IndexWriterConfig(Version.LUCENE_35,new StandardAnalyzer(Version.LUCENE_35));iw = new IndexWriter(directory, iwc);// 3!!创建document对象Document doc = null;// 4!为document添加fieldFile f = new File("E:/Workspaces/STS/Lucene/testfile");for (File file : f.listFiles()) {doc = new Document();Field content = new Field("content", new FileReader(file));Field filename = new Field("filename", file.getName(),Field.Store.YES, Field.Index.NOT_ANALYZED);Field path = new Field("path", file.getAbsolutePath(),Field.Store.YES, Field.Index.NOT_ANALYZED);doc.add(content);doc.add(filename);doc.add(path);// 5!把文档doc添加到索引中iw.addDocument(doc);}} catch (CorruptIndexException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (LockObtainFailedException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {try {iw.close();} catch (CorruptIndexException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
/**
*搜索
*/public void search(){try {//1 在哪搜：创建索引目录Directory dir=FSDirectory.open(new File("E:/lucenetext"));//2 搜谁：读索引IndexReader ir=IndexReader.open(dir);//3 开搜准备：根据indexreader创建indexsearchIndexSearcher isearch=new IndexSearcher(ir);//4 怎么搜：创建搜索query，根据文件域搜索，限定显示条目QueryParser parser=new QueryParser(Version.LUCENE_35, "content",new StandardAnalyzer(Version.LUCENE_35));//表示搜索域中为java的文档Query query=parser.parse("i");//5 根据搜索返回topdocsTopDocs top=isearch.search(query, 10);//6 根据topdocs获取scoredoc对象ScoreDoc[] sdoc=top.scoreDocs;System.out.println("文件条目"+sdoc.length);for(ScoreDoc sd:sdoc){//7 获得文档documentDocument doc=isearch.doc(sd.doc);//8 显示结果System.out.println("文件:");System.out.println("文件名："+doc.get("filename"));System.out.println("路径名："+doc.get("path"));}ir.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}

然后使用junit进行测试：

package testfile;
import org.itat.test.HelloLucene;
import org.junit.Test;
public class test {@Testpublic void testindex(){HelloLucene h=new HelloLucene();h.index();}@Testpublic void testsearch(){HelloLucene h=new HelloLucene();h.search();}
}

错误调试：

错误一：我把索引目录放在了测试文件夹下，第二次创建索引的时候一直显示文件拒绝访问，后发现了这个问题，索引不允许再建索引，索引报异常，换索引文件夹就好了！