StandardAnalyzer に基づく読み取りおよび書き込みインデックスの例の詳細な説明

前言

      使用lucene创建索引时如果指定了解析器，则需要读写都使用这个解析器，目前我发现也就是在处理中文这块比较麻烦，像你在使用solr时如果配置了ik分词，则需要把index清空重新创建才能继续搜索。

      本篇引用lucene-6.4.0和4.x的几个关键类会有不同的地方。

 

创建索引

 1  public void index(){ 2  3         Directory dir=null; 4         Analyzer analyzer=null; 5         IndexWriterConfig config=null; 6         IndexWriter indexWriter=null; 7         try{ 8             /** 9              * SimpleFSDirectory 不能很好支持多线程操作10              * **/11             dir =new SimpleFSDirectory(Paths.get(INDEX_URL));12 13             analyzer=new StandardAnalyzer();14             config =new IndexWriterConfig(analyzer);15             /**16              * IndexWriter(Directory d,IndexWriterConfig config)17              * **/18             indexWriter =new IndexWriter(dir,config);19 20             indexWriter.deleteAll();21             List<UploadBook> books =bookDao.listAllBooks();22             Document document=null;23 24             SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");25 26             for(UploadBook book:books){27                 document=new Document();28                 document.add(new Field("id",book.getId().toString(), TextField.TYPE_STORED));29                 document.add(new Field("ip",book.getIp(), TextField.TYPE_STORED));30                 document.add(new Field("title",book.getOriginFileName(), TextField.TYPE_STORED));31 32                 document.add(new Field("content", PdfReader.read(INDEX_PDF+book.getNewFileName()),TextField.TYPE_STORED));33                 document.add(new Field("createtime",formatter.format(book.getCreateTime()), TextField.TYPE_STORED));34 35                 indexWriter.addDocument(document);36             }37 38             indexWriter.commit();39 40             System.out.println("======索引创建完成，公创建"+books.size()+"条索引========");41         }catch (IOException ex){42             ex.printStackTrace();43         }44         catch(Exception ex){45             ex.printStackTrace();46         }finally {47             if(indexWriter !=null){48                 try{49                     indexWriter.close();50                 }catch (IOException ex){51                     System.out.println("======indexWriter close exception========");52                 }53             }54         }55 56     }

 

读取索引

 1  public static List<Book> search2(String kw){ 2         Directory dir=null; 3         Analyzer analyzer=null; 4         List<Book> list = new ArrayList<Book>(); 5         try{ 6             dir= FSDirectory.open(Paths.get("e:\\soso\\index")); 7             analyzer=new StandardAnalyzer(); 8  9             DirectoryReader reader =DirectoryReader.open(dir);10             IndexSearcher searcher=new IndexSearcher(reader);11 12             QueryParser parser=new QueryParser("content",analyzer);13             Query query =parser.parse(kw);14 15             ScoreDoc[] docs=searcher.search(query,100).scoreDocs;16 17             for (int i = 0; i < docs.length; i++) {18                 Document firstHit = searcher.doc(docs[i].doc);19 20                 Book book=new Book();21                 book.setId(Integer.parseInt(firstHit.getField("id").stringValue()));22                 book.setIp(firstHit.getField("ip").stringValue());23 24                 String title=firstHit.getField("title").stringValue();25                 title=title.substring(0,title.lastIndexOf("."));26                 book.setTitle(title);27 28                 String content=firstHit.getField("content").stringValue();29                 if(content.length()>=500){30                     content=content.substring(0,500)+"......";31                 }32                 book.setContent(content);33 34                 SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-mm");35                 Date date =format.parse(firstHit.getField("createtime").stringValue());36                 book.setCreateTime(format.format(date));37 38                 list.add(book);39 40             }41 42         }catch(Exception ex){43 44         }finally {45             try{46                 dir.close();47 48             }catch(IOException ex){49                 ex.printStackTrace();50             }51         }52 53         return list;54     }

 

以上がStandardAnalyzer に基づく読み取りおよび書き込みインデックスの例の詳細な説明の詳細内容です。詳細については、PHP 中国語 Web サイトの他の関連記事を参照してください。