Lucene高级搜素（Query、QueryParser和分页搜索）

xiaoxiao2021-04-17 30

常用Query查询 1. TermQuery // 指定词元检索第一个参数：field 第二个参数： term 词元 Query query = new TermQuery(new Term("content","百" )); 2. TermRangeQuery // 范围检索（待测试） Query query = new TermRangeQuery("name", new BytesRef("zh"),new BytesRef("an"), true, true); 3. NumericRangeQuery // 按数字范围检索第一个参数：field 第二个参数：start 第三个参数：end 第四个参数：是否包含start值第五个参数：是否包含end值 Query query = NumericRangeQuery.newIntRange("id", 2, 3, true,false); 4. PrefixQuery // 按指定前缀检索 Query query = new PrefixQuery(new Term("name","lis")); 5. WildcardQuery // 通配符检索 ? 表示占1个字符 * 匹配0-n个字符 Query query = new WildcardQuery(new Term("content","育*")); 6. FuzzyQuery // 模糊检索搜索的关键字即使有错，在一定范围内也可以查到 Query query = new FuzzyQuery(new Term("content","baiahi")); //baizhi 7. BooleanQuery // 布尔检索 BooleanQuery query = new BooleanQuery(); TermQuery query1 = new TermQuery(new Term("content","百")); TermQuery query2 = new TermQuery(new Term("name","zhangsan")); // Occur.xxx 可选值：MUST--->必须存在 MUST_NOT--->必须不存在 SHOULD--->可有可无 query.add(query1,Occur.MUST_NOT); //第二个参数：查询的结果中不要包含 "百" 文档 query.add(query2,Occur.MUST); 8. PhraseQuery // 短语检索一般适用于英文短句检索 PhraseQuery query = new PhraseQuery(); // slop是指两个项的位置之间允许的最大间隔距离 query.setSlop(1); query.add(new Term("content","i")); query.add(new Term("content","baizhi")); // 检索 i [**] baizhi 的所有文档

基于QueryParser的高级搜索(可以替换Query查询) /** * * @author gaozhy * @description queryParser 检索 * @2017年4月13日上午10:48:03 */ @Test public void indexSearchByQueryParser(){ try { FSDirectory directory = FSDirectory.open(Paths.get("F:\\lucene\\index\\example03")); IndexReader indexReader = DirectoryReader.open(directory); DirectoryReader directoryReader = DirectoryReader.openIfChanged((DirectoryReader) indexReader); if(directoryReader != null) indexReader = directoryReader; // 创建检索器 IndexSearcher searcher = new IndexSearcher(indexReader); // 创建查询解析器第一个参数：指定默认检索域第二个参数：分词器 QueryParser queryParser = new QueryParser("content", new StandardAnalyzer()); Query query = null; // 使用 parse(表达式) 可以完全替换Query查询 // 分词检索 query = queryParser.parse("百知"); // 范围检索不支持数值范围检索 // test ---> 表示检索域 [a TO e] ---> test域中a到e的文档(包括a和e) query = queryParser.parse("test:[a TO e]"); // test ---> 表示检索域 {a TO e} ---> test域中a到e的文档(不包括a和z) query = queryParser.parse("age:{10 TO 20}"); // 通配符检索 query = queryParser.parse("百*"); query = queryParser.parse("lo?e"); query = queryParser.parse("baiz?i"); // 模糊检索 ~ 表示模糊检索 query = queryParser.parse("baizha~"); query = queryParser.parse("lovi~"); // 多条件检索 //检索name中有zhangsan 或者 content中有lucene的文档 query = queryParser.parse("name:zhangsan OR lucene"); //检索name中有zhangsan 并且 content中有lucene的文档 query = queryParser.parse("name:zhangsan AND baizhi"); //检索name中有zhangsan 并且 content中没有lucene的文档 query = queryParser.parse("name:zhangsan NOT lucene"); // 短语检索 query = queryParser.parse("content:\"love lucene\""); // 临近检索：词组中的多个词之间的距离之和不超过1，则满足查询。 query = queryParser.parse("content:\"i lucene\"~1"); // 加权检索 query = queryParser.parse("百知^0.1"); // 布尔检索 query = queryParser.parse("+love -name:zhangsan"); query = queryParser.parse("love -baizhi"); TopDocs topDocs = searcher.search(query, 10); System.out.println("查询结果："+topDocs.totalHits+"条"); System.out.println("最大文档数："+indexReader.maxDoc()); System.out.println("最大索引文档数："+indexReader.numDocs()); for(ScoreDoc sd : topDocs.scoreDocs){ System.out.print(searcher.doc(sd.doc).get("id")+" | ");; System.out.print(searcher.doc(sd.doc).get("name")+" | ");; System.out.print(searcher.doc(sd.doc).get("content")+" | ");; System.out.print(DateTools.stringToDate(searcher.doc(sd.doc).get("date"))); System.out.println(); } indexReader.close(); directory.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }

/** * * @author gaozhy * @description 创建索引文件 * @2017年4月12日下午4:18:32 */ @Test public void indexCreate(){ try { FSDirectory directory = FSDirectory.open(Paths.get("F:\\lucene\\index\\example03")); StandardAnalyzer analyzer = new StandardAnalyzer(); IndexWriter indexWriter = new IndexWriter(directory, new IndexWriterConfig(analyzer)); Document doc1 = new Document(); doc1.add(new IntField("id",1,Field.Store.YES)); doc1.add(new StringField("name", "zhangsan", Field.Store.YES)); doc1.add(new StringField("age", "15", Field.Store.YES)); doc1.add(new StringField("test", "a", Field.Store.YES)); doc1.add(new TextField("content", "百知教育 I love baizhi", Field.Store.YES)); doc1.add(new Field("date", DateTools.dateToString(new Date(), Resolution.SECOND), StringField.TYPE_STORED)); Document doc2 = new Document(); doc2.add(new IntField("id",2,Field.Store.YES)); doc2.add(new StringField("test", "e", Field.Store.YES)); doc2.add(new StringField("age", "18", Field.Store.YES)); doc2.add(new StringField("name", "lisi", Field.Store.YES)); doc2.add(new TextField("content", "lucene实战开发 I love Lucene", Field.Store.YES)); doc2.add(new Field("date", DateTools.dateToString(new Date(), Resolution.SECOND), StringField.TYPE_STORED));indexWriter.addDocument(doc1); indexWriter.addDocument(doc2); indexWriter.close(); directory.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }

分页检索 /** * * @author gaozhy * @description 添加测试数据 * @2017年4月14日上午9:35:09 */ @Test public void addTestData(){ try { FSDirectory directory = FSDirectory.open(Paths.get("F:\\lucene\\index\\example04")); IndexWriter indexWriter = new IndexWriter(directory,new IndexWriterConfig(new StandardAnalyzer())); Document doc = null; for (int i = 1; i <= 100; i++) { doc = new Document(); doc.add(new IntField("id", i, Store.YES)); doc.add(new StringField("name", "张三"+i,Store.YES)); doc.add(new TextField("content", new StringReader("java"))); indexWriter.addDocument(doc); } indexWriter.close(); directory.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }

/** * * @author gaozhy * @description 分页检索 * @2017年4月14日上午9:27:01 */ @Test public void indexSearchByPage() { try { FSDirectory directory = FSDirectory.open(Paths.get("F:\\lucene\\index\\example04")); IndexReader indexReader = DirectoryReader.open(directory); DirectoryReader directoryReader = DirectoryReader.openIfChanged((DirectoryReader) indexReader); if(directoryReader != null){ indexReader.close(); indexReader = directoryReader; } IndexSearcher searcher = new IndexSearcher(indexReader); QueryParser parser = new QueryParser("content", new StandardAnalyzer()); Query query = parser.parse("name:张三*"); //查所有 //TopDocs topDocs = searcher.search(query, 100); int nowPage = 8; int pageSize = 10; // 获取起始条数第三页 start=20 int start = (nowPage-1)*pageSize; // 查询当前页的前一条记录根据query查20个文档 TopDocs td1 = searcher.search(query, start); // 第一页 scoreDoc = null ScoreDoc scoreDoc = null; // 不是第一页 socreDoc = 第19个文档 if (start > 1){ scoreDoc = td1.scoreDocs[start-1]; } //第一个参数：上一页查询到最后一条记录第二个参数：查询条件第二个参数：查询条数 TopDocs topDocs = searcher.searchAfter(scoreDoc, query, pageSize); System.out.println("总条数:"+topDocs.totalHits); for (ScoreDoc sd : topDocs.scoreDocs) { Document doc = searcher.doc(sd.doc); System.out.print(doc.get("id")+" | "); System.out.print(doc.get("name")+" | "); System.out.print(doc.get("content")); System.out.println(); } indexReader.close(); directory.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }

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