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();
    }