索引庫(kù)的添加

• 向索引庫(kù)中添加document對(duì)象透敌， 步驟
  1. 第一步：先創(chuàng)建一個(gè)indexwriter對(duì)象
  2. 第二步：創(chuàng)建一個(gè)document對(duì)象
  3. 第三步：把document對(duì)象寫入索引庫(kù)
  4. 第四步：關(guān)閉indexwriter么库。

/**
     * 刪除索引
     * @throws Exception
     */
    @Test
    public void testDeleteIndex() throws Exception{
        //創(chuàng)建分詞器,StandardAnalyzer標(biāo)準(zhǔn)分詞器,標(biāo)準(zhǔn)分詞器對(duì)英文分詞效果很好,對(duì)中文是單字分詞
        Analyzer analyzer = new IKAnalyzer();
        //指定索引和文檔存儲(chǔ)的目錄
        FSDirectory directory = FSDirectory.open(new File("D:\\BaiduNetdiskDownload\\lucene_day01\\tmp"));

        //創(chuàng)建寫對(duì)象的初始化對(duì)象
        IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_4_10_3,analyzer);
        //創(chuàng)建索引和文檔寫對(duì)象
        IndexWriter indexWriter = new IndexWriter(directory , config);
        //刪除所有
//        indexWriter.deleteAll();

        /**
         * Term詞元,就是一個(gè)詞,
         * 第一個(gè)參數(shù):域名,
         * 第二個(gè)參數(shù):要?jiǎng)h除含有此關(guān)鍵詞的數(shù)據(jù)
         */
        Term term = new Term("fileName" , "apache");
        //根據(jù)名稱進(jìn)行刪除
        indexWriter.deleteDocuments(term);
        //提交
        indexWriter.commit();
        //關(guān)閉
        indexWriter.close();
    }

    /**
     * 更新就是按照傳入的Term進(jìn)行搜索,如果找到結(jié)果那么刪除,將更新的內(nèi)容重新生成一個(gè)Document對(duì)象
     * 如果沒有搜索到結(jié)果,那么將更新的內(nèi)容直接添加一個(gè)新的Document對(duì)象
     * @throws Exception
     */

索引庫(kù)刪除

刪除全部

//刪除全部索引
    @Test
    public void deleteAllIndex() throws Exception {
        IndexWriter indexWriter = getIndexWriter();
        //刪除全部索引
        indexWriter.deleteAll();
        //關(guān)閉indexwriter
        indexWriter.close();
    }

說明：將索引目錄的索引信息全部刪除上炎，直接徹底刪除拴竹，無法恢復(fù)扫俺。
此方法慎用Ｂ酚ァ惨篱！

指定查詢條件刪除

//根據(jù)查詢條件刪除索引
    @Test
    public void deleteIndexByQuery() throws Exception {
        IndexWriter indexWriter = getIndexWriter();
        //創(chuàng)建一個(gè)查詢條件
        Query query = new TermQuery(new Term("filename", "apache"));
        //根據(jù)查詢條件刪除
        indexWriter.deleteDocuments(query);
        //關(guān)閉indexwriter
        indexWriter.close();
    }

索引庫(kù)的修改

原理就是先刪除后添加盏筐。

    @Test
    public void testUpdateIndex() throws Exception{
        //創(chuàng)建分詞器,StandardAnalyzer標(biāo)準(zhǔn)分詞器,標(biāo)準(zhǔn)分詞器對(duì)英文分詞效果很好,對(duì)中文是單字分詞
        Analyzer analyzer = new IKAnalyzer();
        //指定索引和文檔存儲(chǔ)的目錄
        FSDirectory directory = FSDirectory.open(new File("D:\\BaiduNetdiskDownload\\lucene_day01\\tmp"));

        //創(chuàng)建寫對(duì)象的初始化對(duì)象
        IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_4_10_3,analyzer);
        //創(chuàng)建索引和文檔寫對(duì)象
        IndexWriter indexWriter = new IndexWriter(directory , config);

        Term term = new Term("fileName","1.create web page.txt");

        Document doc = new Document();
        doc.add(new TextField("fileName", "xxxxxxx", Field.Store.YES));
        doc.add(new TextField("fileContext", "xxx I like you very much!", Field.Store.YES));
        doc.add(new LongField("fileSize", 100L, Field.Store.YES));


        indexWriter.updateDocument(term , doc);

        //提交
        indexWriter.commit();
        //關(guān)閉
        indexWriter.close();
    }