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private IndexWriter writer;
private IndexReader reader;

private static final String INDEX_DIR = "E:/LuceneIndex";



public IndexWriter getIndexWriter(String indexDir) throws Exception {
    if (writer == null) {
        Analyzer analyzer = getAnalyzer();
        IndexWriterConfig writerConfig = new IndexWriterConfig(analyzer);
        
        
        Directory directory = FSDirectory.open(Paths.get(indexDir));
        writer = new IndexWriter(directory, writerConfig);
    }
    return writer;
}




public IndexReader getIndexReader(String indexDir) throws IOException {
    if (reader == null) {
        Directory directory = FSDirectory.open(Paths.get(indexDir));
        reader = DirectoryReader.open(directory);
        
        System.out.println("当前存储的文档数:" + reader.numDocs());
        System.out.println("当前存储的文档数，包含回收站的文档:" + reader.maxDoc());
        System.out.println("回收站的文档数:" + reader.numDeletedDocs());
    }
    return reader;
}




public void close() throws Exception {
    writer.close();
    reader.close();
}
 



private Analyzer getAnalyzer(){
    return new StandardAnalyzer();
}

@Test
public void testWriter() throws Exception {
    IndexWriter writer = getIndexWriter(INDEX_DIR);
    Document document = new Document();
    
    document.add(new TextField("name", "hello world", Field.Store.YES));
    document.add(new TextField("describes", "测试luence", Field.Store.YES));
     
    writer.addDocument(document);
    writer.close();
}

@Test
public void testReader() throws Exception {
    IndexReader reader = getIndexReader(INDEX_DIR);
    IndexSearcher searcher = new IndexSearcher(reader);
    
    QueryParser parser = new QueryParser("describes", getAnalyzer());
    
    Query query = parser.parse("试");
    
    TopDocs hits = searcher.search(query, 10);
    for (ScoreDoc sd : hits.scoreDocs) {
        Document doc = searcher.doc(sd.doc);
        System.out.println(doc.get("name") + "[describes]=" + doc.get("describes"));
    }
    reader.close();
}