lucene5(1)简单示例

NO BIBI亮代码

private IndexWriter writer;
private IndexReader reader;
// lucene索引存放了路径
private static final String INDEX_DIR = "E:/LuceneIndex";
/**
 * 实例化写索引
 */
public IndexWriter getIndexWriter(String indexDir) throws Exception {
    if (writer == null) {
        Analyzer analyzer = getAnalyzer();
        IndexWriterConfig writerConfig = new IndexWriterConfig(analyzer);
        // Directory ramDirectory= new RAMDirectory();//索引写入内存
        // 索引存储磁盘位置
        Directory directory = FSDirectory.open(Paths.get(indexDir));
        writer = new IndexWriter(directory, writerConfig);
    }
    return writer;
}

/**
 * 获取读索引实体，并打印读到的索引信息
 */
public IndexReader getIndexReader(String indexDir) throws IOException {
    if (reader == null) {
        Directory directory = FSDirectory.open(Paths.get(indexDir));
        reader = DirectoryReader.open(directory);
        // 通过reader可以有效的获取到文档的数量
        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;
}

/**
 * 关闭写索引
 */
public void close() throws Exception {
    writer.close();
    reader.close();
}
 
/**
 * 获取分词器
 */
private Analyzer getAnalyzer(){
    return new StandardAnalyzer();
}

@Test
public void testWriter() throws Exception {
    IndexWriter writer = getIndexWriter(INDEX_DIR);
    Document document = new Document();// 实例化一个文档
    // 添加一个文档信息，相当于一个数据库表字段
    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);
    // 指定Document被搜索的属性
    QueryParser parser = new QueryParser("describes", getAnalyzer());
    // 指定索引内容
    Query query = parser.parse("试");
    // 搜索前十个
    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();
}