Lucene初体验——Hello Word实现

1、创建索引

 /**
      * 建立索引
      */
     public void index(){
         IndexWriter writer=null;
         try {
             //1.创建Directory
             //Directory directory=new RAMDirectory();//建立在内存中
             Directory directory=FSDirectory.open(new File("D:/lucene/lucene01"));//创建在硬盘上
             //2.创建IndexWrite
             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;
             //4.为Document添加Field
             File f=new File("D:/lucene/example");
             for (File file:f.listFiles()) {
                 doc=new Document();
                 doc.add(new Field("content",new FileReader(file)));
                 doc.add(new Field("filename",file.getName(),Field.Store.YES,Field.Index.NOT_ANALYZED));
                 doc.add(new Field("path",file.getAbsolutePath(),Field.Store.YES,Field.Index.NOT_ANALYZED));
                 //5.通过Index Writer添加文档到索引中
                 writer.addDocument(doc);
             }

         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }finally{
             if(writer!=null){
                 try {
                     writer.close();
                 } catch (IOException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
             }
         }

     }

2、搜索

 /***
      * 搜索
      */
     public void searcher(){
         try {
             //1.创建Directory
             Directory directory=FSDirectory.open(new File("D:/lucene/lucene01"));//创建在硬盘上
             //2.创建IndexReader
             IndexReader reader=IndexReader.open(directory);
             //3.根据IndexReader创建IndexSearcher
             IndexSearcher searcher=new IndexSearcher(reader);
             //4.创建搜索的Query
             //创建parser来确定要搜索文件的内容，第二个参数表示搜索的域
             QueryParser parser=new QueryParser(Version.LUCENE_35, "content", new StandardAnalyzer(Version.LUCENE_35));
             //创建query，表示搜索域为content中包含Java的文档
             Query query=parser.parse("migrate");
             //5.根据searcher搜索并且返回TopDocs
             //10 搜索条数
             TopDocs tds=searcher.search(query, 10);
             //6.根据TopDocs获取ScoreDoc对象
             ScoreDoc[] sds= tds.scoreDocs;
             for (ScoreDoc sd : sds) {
                 //7.根据searcher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")+"]");
             }

             //9.关闭reader
             reader.close();
         } catch (CorruptIndexException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (ParseException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

3、Junit测试

         @Test
     public void testIndex(){
         HelloLucene hl=new HelloLucene();
         hl.index();
     }

     @Test
     public void testSearch(){
         HelloLucene hl=new HelloLucene();
         hl.searcher();
     }