lucene的第九篇——索引的增删改

索引的增删改查，因为查询有几种情况，不想代码太长，就将查分离出来了，下一篇写查

//创建索引
@Test
public void creatIndex() throws IOException{

    Directory directory = FSDirectory.open(new File("G:\\a\\v"));
    Analyzer ikAnalyzer = new  IKAnalyzer();
    IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_4_10_3, ikAnalyzer);
    //获得indexwriter

    IndexWriter indexWriter = new IndexWriter(directory, indexWriterConfig);
    //获得资源文件集合
    File f = new File("G:\\a\\新建文件夹");
    File[] listFiles = f.listFiles();

    for (File file : listFiles) {


        //创建文档对象
        Document document = new  Document();
        //获得每个文件的属性：
        String file_name = file.getName();
        long file_size = FileUtils.sizeOf(file);
        String file_path = file.getPath();
        String file_content = FileUtils.readFileToString(file);


        //创建四个域，分别存放着四个信息
        TextField filename = new TextField("file_name", file_name,Store.YES);
        TextField filesize = new TextField("file_size", String.valueOf(file_size),Store.YES);
        TextField filepath = new TextField("file_path", file_path,Store.YES);
        TextField filecontent = new TextField("file_content", file_content,Store.YES);

        document.add(filename);
        document.add(filesize);
        document.add(filepath);
        document.add(filecontent);

        indexWriter.addDocument(document);

    }
    indexWriter.close();
}

// 查询索引
    @Test
    public void testSearchIndex() throws Exception {
        // 第一步：查询准备工作
        // 创建Directory对象
        Directory dir = FSDirectory.open(new File("G:\\a\\v"));
        // 创建IndexReader对象
        IndexReader reader = DirectoryReader.open(dir);
        // 创建IndexSearcher对象
        IndexSearcher searcher = new IndexSearcher(reader);
        // 第二步：创建查询条件对象
        TermQuery query = new TermQuery(new Term("file_name", "全文"));
        // 第三步：执行查询（参数1：查询条件对象，参数2：查询结果返回的最大值）
        TopDocs topDocs = searcher.search(query, 10); 
        // 第四步：处理查询结果
        // 输出结果数量
        System.out.println("查询的结果数量：" + topDocs.totalHits);
        // 取得结果集
        ScoreDoc[] scoreDocs = topDocs.scoreDocs;
        // 遍历结果集
        for (ScoreDoc scoreDoc : scoreDocs) {
            // 根据文档对象ID取得文档对象
            Document doc = searcher.doc(scoreDoc.doc);
            // 打印搜索结果内容
            // 文件名称
            System.out.println("文件名称：" + doc.get("file_name"));
            // 文件路径
            System.out.println("文件路径：" + doc.get("file_path"));
            // 文件大小
            System.out.println("文件大小：" + doc.get("file_size"));
        }
        // 关闭IndexReader对象
        reader.close();
    }


//删除索引——全部删除
@Test
public void deleteAll() throws IOException{


    //获得索引存放位置的
    Directory directory = FSDirectory.open(new File("G:\\a\\v"));

    //获得分词器
    Analyzer analyzer=new IKAnalyzer();
    //获得indexwriterconfig 对象
    IndexWriterConfig indexWriterConfig = new  IndexWriterConfig(Version.LUCENE_4_10_3, analyzer);

    //获得indexwriter对象
    IndexWriter indexWriter = new  IndexWriter(directory, indexWriterConfig);
    //====================
    indexWriter.deleteAll();
    //=====================
    indexWriter.close();


}


//删除索引——按条件删除
@Test
public void delete() throws IOException{
    //获得directory对象
    Directory directory = FSDirectory.open(new File("G:\\a\\v"));
    //获得分词器
    Analyzer analyzer =new IKAnalyzer();
    //获得indexwriterconfig 对象
    IndexWriterConfig indexWriterConfig = new  IndexWriterConfig(Version.LUCENE_4_10_3,analyzer);
    //获得indexwriter 对象
    IndexWriter indexWriter = new  IndexWriter(directory, indexWriterConfig);
    //===========================================

    Term t = new Term("fileName","全文");
    TermQuery query = new  TermQuery(t);

    indexWriter.deleteDocuments(query);
    //=============================================
    indexWriter.close();

}

//更新索引
@Test
public void update() throws IOException{
    //获得directory对象
    Directory open = FSDirectory.open(new File("G:\\a\\v"));
    //获得分词器
    Analyzer analyzer=new IKAnalyzer();
    //获得indexwriterconfig 对象
    IndexWriterConfig indexWriterConfig = new  IndexWriterConfig(Version.LUCENE_4_10_3, analyzer);
    //获得indexwriter对象

    IndexWriter indexWriter = new IndexWriter(open,indexWriterConfig);
    //更新索引
    //=================================================
    Document doc = new Document();
    doc.add(new TextField("filen", "测试文件名",Store.YES));
    doc.add(new TextField("fileC", "测试文件内容",Store.YES));
    indexWriter.updateDocument(new Term("file_name","全文"), doc, new IKAnalyzer());
    //===============================================
    indexWriter.close();


}

返回lucene/slor文章的目录：http://blog.csdn.net/m15517986455/article/details/78986856