Lucene 6.0.0从索引中删除文档

Question

public void delete(String fname, String index_path)
   {
        try {
            Analyzer analyzer = new StandardAnalyzer();
            QueryParser parser = new QueryParser(LuceneConstants.FILE_NAME, analyzer);
            Directory indexDirectory = FSDirectory.open(Paths.get(index_path));
            IndexWriterConfig iwg = new IndexWriterConfig(analyzer);
            iwg.setMaxBufferedDeleteTerms(1);
            iwg.setOpenMode(IndexWriterConfig.OpenMode.APPEND);
            IndexWriter writer = new IndexWriter(indexDirectory,iwg);
            writer.deleteDocuments(new Term(LuceneConstants.FILE_NAME,fname));
            writer.forceMergeDeletes();
            writer.commit();
            writer.flush();
            System.out.println(writer.hasDeletions());
            writer.close();
            System.out.println("Deleted File :"+fname);
        } catch (IOException ex) {
            Logger.getLogger(IndexHandler.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ParseException ex) {
            Logger.getLogger(IndexHandler.class.getName()).log(Level.SEVERE, null, ex);
        }
   }

Answer 1

您应该小心使用分析过的查询进行删除。请记住，deletedocuments将在运行查询时删除所有搜索结果，而不是只删除最佳或第一个结果。

假设您试图删除路径为“/rootdirectory/testfile.txt”的文件

分析后的查询如下所示:filename:rootdirectory filename:testfile.txt