一.创建索引

1 @Test 2     public void indexCreate() throws IOException { 3         //创建分词器 4         Analyzer analyzer = new StandardAnalyzer(); 5         IndexWriterConfig config = new IndexWriterConfig(analyzer); 6          7         //指定索引存放目录以及配置参数 8         Directory directory =FSDirectory.open(Paths.get("F:/luceneIndex")); 9         IndexWriter writer = new IndexWriter(directory,config);10             11         //采集数据12         List
     
       bookList = bookDao.findAll();13         /*for (Book book : bookList) {14             System.out.println(book.getName());15         }*/16         //将采集的数据封装到Document中17         Document doc = null;18         for (Book book : bookList) {19             doc  = new Document();20              // store:如果是yes，则说明存储到文档域中21             //id:不分词,索引,存储22             Field id = new StringField("id",book.getId().toString(),Store.YES);23             24             //name:分词,索引,存储25             Field name = new TextField("name",book.getName(),Store.YES);26             //price:不分词,索引,存储,27             Field price = new FloatPoint("price",book.getPrice());28             29             //pic:不分词,不索引,存储,存储要添加一个同名的StoredField30             Field pic   = new StoredField("pic",book.getPic());31             //desciption:分词,索引,不存储32             Field description = new TextField("description",book.getDescription(),Store.NO);    33             doc.add(id);34             doc.add(name);35             doc.add(price);36             doc.add(new StoredField("price",book.getPrice()));//存储37             doc.add(new NumericDocValuesField("price",book.getPrice().longValue()));//排序38             doc.add(pic);39             doc.add(description);40             41             //生成索引42             writer.addDocument(doc);43         }44         45         //关闭46         writer.close();47     }
     

注意:创建索引时,对应price采用了FloatPoint,如果要对此字段进行存储,要添加同名的StoredField,如果要对此字段进行排序,要添加同名的NumericDocValuesField,

否则会报unexpected docvalues type异常

二.排序

1 //查询 2     @Test 3     public void indexSearch() throws IOException, ParseException { 4         String[] fields = {"name","description"}; 5         MultiFieldQueryParser parser = new MultiFieldQueryParser(fields,new StandardAnalyzer()); 6         Query query = parser.parse("lucene"); 7         query = parser.parse("java"); 8         doSearch(query); 9     }10     11     private void doSearch (Query query) {12         Directory directory;13         try {14             directory = FSDirectory.open(Paths.get("F:/luceneIndex"));15         16         IndexReader reader = DirectoryReader.open(directory);17         //创建IndexSearcher18         IndexSearcher searcher = new IndexSearcher(reader);19         //true表示降序20         //SortField.Type.SCORE  根据相关度进行排序(默认)21         //SortField.Type.DOC    根据文档编号或者说是索引顺序22         //SortField.Type.FLOAT(Long等),根据fieldName的数值类型进行排序23         SortField sortField = new SortField("price",SortField.Type.FLOAT,true);24         Sort sort = new Sort(sortField);25         TopDocs topDocs = searcher.search(query,10,sort);26         long count = topDocs.totalHits;27         System.out.println("匹配的总条数是----" + count);28         29         //根据相关度排序后的结果30         ScoreDoc[] docs = topDocs.scoreDocs;31         for (ScoreDoc scoreDoc : docs) {32             int docId = scoreDoc.doc;33             Document document = searcher.doc(docId);34             System.out.println("id----"+document.get("id"));35             System.out.println("name----"+document.get("name"));36             System.out.println("price----"+document.get("price"));37             /*System.out.println("pic----"+document.get("pic"));38             System.out.println("description----"+document.get("description"));*/39             System.out.println("======================");40         }41         reader.close();42         } catch (IOException e) {43             // TODO Auto-generated catch block44             e.printStackTrace();45         }46         47     }

此外还有

//Sort.RELEVANCE 根据相关度排序

//Sort.INDEXORDER 根据索引顺序排序

TopDocs topDocs = searcher.search(query,10,Sort.INDEXORDER);