/*** Lucene入门* 操作索引*/
public class ManageIndex {public IndexWriter getIndexWriter() throws Exception {//设置索引库的位置Directory directory = FSDirectory.open(new File("E:\\zhanghaoBF\\luceneSolr\\indexLibrary").toPath());Analyzer analyzer = new StandardAnalyzer();//创建分词器对象（官方推荐标准分词器）IndexWriterConfig indexWriterConfig = new IndexWriterConfig(analyzer);//设置使用的分词器return new IndexWriter(directory, indexWriterConfig);//索引对象
    }/*** 全删除（PS:索引里面的文档也会删掉）** @throws Exception*/@Testpublic void deleteAllIndex() throws Exception {IndexWriter indexWriter = getIndexWriter();//获取索引的流对象indexWriter.deleteAll();//删除全部索引indexWriter.close();//关流
    }/*** 按条件删除（PS:索引里面的文档也会删掉）** @throws Exception*/@Testpublic void deleteIndex() throws Exception {IndexWriter indexWriter = getIndexWriter();//获取索引的流对象Query query = new TermQuery(new Term("fileContent", "lucene"));//PS:TermQuery为精准匹配indexWriter.deleteDocuments(query);//按条件删除索引indexWriter.close();//关流
    }/*** 修改（PS:先删除后新增，与数据库里面的修改不一样，注意区分）** @throws Exception*/@Testpublic void updateIndex() throws Exception {//获取索引的流对象IndexWriter indexWriter = getIndexWriter();//构建一个文档对象Document doc = new Document();doc.add(new TextField("fileName", "新的文件名称", Field.Store.YES));doc.add(new TextField("fileContent", "新的文件内容", Field.Store.YES));//调用更新操作，先把符合条件的索引删掉（包括term和存在索引库的文档），然后把刚才新增的文档对象加入到索引库中indexWriter.updateDocument(new Term("fileName", "是"), doc);//按条件删除索引，再加入新的索引//PS:删掉的文档还是会占用对应的文档ID，新增的文档排在最后（和数据库ID自增时的删除再添加一个道理）//关流
        indexWriter.close();}
}