for (Book book : list) {document = new Document();// store:如果是yes，则说明存储到文档域中// 图书ID// 不分词、索引、存储 StringFieldField id = new StringField("id", book.getId().toString(), Store.YES);// 图书名称// 分词、索引、存储 TextFieldField name = new TextField("name", book.getName(), Store.YES);// 图书价格// 分词、索引、存储 但是是数字类型，所以使用FloatFieldField price = new FloatField("price", book.getPrice(), Store.YES);// 图书图片地址// 不分词、不索引、存储 StoredFieldField pic = new StoredField("pic", book.getPic());// 图书描述// 分词、索引、不存储 TextFieldField description = new TextField("description", book.getDescription(), Store.NO);
// 将field域设置到Document对象中
            document.add(id);·············
}

语法（具体参照创建索引的程序）：IndexWriter.addDocument(document);

   ······   // a)创建分词器，标准分词器（分析文档，对文档中的Field域进行分词）Analyzer analyzer = new StandardAnalyzer();// b)创建IndexWriterConfig对象IndexWriterConfig cfg = new IndexWriterConfig(Version.LUCENE_4_10_3, analyzer);// c)创建索引库目录，指定索引库的地址File indexFile = new File("D:\\DBIndex\\");Directory directory = FSDirectory.open(indexFile);// d)创建IndexWriter对象IndexWriter writer = new IndexWriter(directory, cfg);// e)通过IndexWriter对象将Document写入到索引库中for (Document doc : docList) {writer.addDocument(doc);}// f)关闭writerwriter.close();   ······

@Testpublic void deleteIndex() throws Exception {// 创建分词器，标准分词器Analyzer analyzer = new StandardAnalyzer();// 创建IndexWriterIndexWriterConfig cfg = new IndexWriterConfig(Version.LUCENE_4_10_3, analyzer);Directory directory = FSDirectory.open(new File("D:\\DBIndex\\"));// 创建IndexWriterIndexWriter writer = new IndexWriter(directory, cfg);        // Termswriter.deleteDocuments(new Term("id", "1"));
writer.close();}

@Testpublic void deleteIndex() throws Exception {// 创建分词器，标准分词器Analyzer analyzer = new StandardAnalyzer();// 创建IndexWriterIndexWriterConfig cfg = new IndexWriterConfig(Version.LUCENE_4_10_3, analyzer);Directory directory = FSDirectory.open(new File("D:\\DBIndex\\"));// 创建IndexWriterIndexWriter writer = new IndexWriter(directory, cfg);// Terms// writer.deleteDocuments(new Term("id", "1"));// 删除全部（慎用）
        writer.deleteAll();writer.close();}

@Testpublic void updateIndex() throws Exception {// 创建分词器，标准分词器Analyzer analyzer = new StandardAnalyzer();// 创建IndexWriterIndexWriterConfig cfg = new IndexWriterConfig(Version.LUCENE_4_10_3, analyzer);Directory directory = FSDirectory.open(new File("D:\\DBIndex\\"));// 创建IndexWriterIndexWriter writer = new IndexWriter(directory, cfg);// 第一个参数：指定查询条件// 第二个参数：修改之后的对象// 修改时如果根据查询条件，可以查询出结果，则将以前的删掉，然后覆盖新的Document对象，如果没有查询出结果，则新增一个Document// 修改流程即：先查询，再删除，在添加Document doc = new Document();doc.add(new TextField("name", "lisi", Store.YES));writer.updateDocument(new Term("name", "zhangsan"), doc);writer.close();}