lucene3.0学习笔记2-(再学Lucene的简单例子)

langhua9527

又在看Lucene,这回Lucene变成3.0了，太快了，Lucene in action 第二版也出来了
所以决定看一看

做了两个简单的例子
创建索引
package com.langhua;import java.io.File;import java.io.FileReader;import java.io.IOException;import java.util.Date;import org.apache.lucene.analysis.standard.StandardAnalyzer;import org.apache.lucene.document.DateTools;import org.apache.lucene.document.Document;import org.apache.lucene.document.Field;import org.apache.lucene.index.IndexWriter;import org.apache.lucene.store.Directory;import org.apache.lucene.store.SimpleFSDirectory;import org.apache.lucene.util.Version;/** * 创建索引 Lucene 3.0+ * @author Administrator * */public class Indexer {/** * @param args * @throws IOException  */public static void main(String[] args) throws IOException {//保存索引文件的地方String indexDir = "F:\\indexDir";//将要搜索TXT文件的地方String dateDir = "F:\\dateDir";IndexWriter indexWriter = null;//创建Directory对象Directory dir = new SimpleFSDirectory(new File(indexDir));//创建IndexWriter对象,第一个参数是Directory,第二个是分词器,第三个表示是否是创建,如果为false为在此基础上面修改,第四表示表示分词的最大值，比如说new MaxFieldLength(2)，就表示两个字一分，一般用IndexWriter.MaxFieldLength.LIMITED indexWriter = new IndexWriter(dir,new StandardAnalyzer(Version.LUCENE_30),true,IndexWriter.MaxFieldLength.UNLIMITED);File[] files = new File(dateDir).listFiles();for (int i = 0; i < files.length; i++) {Document doc = new Document();//创建Field对象，并放入doc对象中doc.add(new Field("contents", new FileReader(files))); doc.add(new Field("filename", files.getName(), Field.Store.YES, Field.Index.NOT_ANALYZED));doc.add(new Field("indexDate",DateTools.dateToString(new Date(), DateTools.Resolution.DAY),Field.Store.YES,Field.Index.NOT_ANALYZED));//写入IndexWriterindexWriter.addDocument(doc);}//查看IndexWriter里面有多少个索引System.out.println("numDocs"+indexWriter.numDocs());indexWriter.close();}}

搜索索引 Lucene 3.0+

package com.langhua;import java.io.File;import java.io.IOException;import org.apache.lucene.analysis.standard.StandardAnalyzer;import org.apache.lucene.document.Document;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.SimpleFSDirectory;import org.apache.lucene.util.Version;/** * 搜索索引 Lucene 3.0+ * @author Administrator * */public class Searcher {public static void main(String[] args) throws IOException, ParseException {//保存索引文件的地方String indexDir = "F:\\indexDir";Directory dir = new SimpleFSDirectory(new File(indexDir));//创建 IndexSearcher对象，相比IndexWriter对象，这个参数就要提供一个索引的目录就行了IndexSearcher indexSearch = new IndexSearcher(dir);//创建QueryParser对象,第一个参数表示Lucene的版本,第二个表示搜索Field的字段,第三个表示搜索使用分词器QueryParser queryParser = new QueryParser(Version.LUCENE_30,"contents", new StandardAnalyzer(Version.LUCENE_30));//生成Query对象Query query = queryParser.parse("langhua9527");//搜索结果 TopDocs里面有scoreDocs[]数组，里面保存着索引值TopDocs hits = indexSearch.search(query, 10);//hits.totalHits表示一共搜到多少个System.out.println("找到了"+hits.totalHits+"个");//循环hits.scoreDocs数据，并使用indexSearch.doc方法把Document还原，再拿出对应的字段的值for (int i = 0; i < hits.scoreDocs.length; i++) {ScoreDoc sdoc = hits.scoreDocs;Document doc = indexSearch.doc(sdoc.doc);System.out.println(doc.get("filename"));}indexSearch.close();}}