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Lucene中内置常用Query对象

来源:程序员人生   发布时间:2014-12-18 08:50:34 阅读次数:3663次

       以下这几种lucene内置查询对象,不过在实际的项目开发中,这类查询方式利用的不多。1般用QueryParser去获得查询对象。由于QueryParser内部基本实现了所有的内置查询对象。

      这是最多见的QueryParse的写法

/** * 通过QueryParser去获得查询对象 * * @throws ParseException */ @Test public void searchByQueryParse() throws ParseException { // 1创建QueryParser对象,默许域为content,可以改变 QueryParser parser = new QueryParser(Version.LUCENE_35, "content", new StandardAnalyzer(Version.LUCENE_35)); // 改变空格的默许操作符,以下可以改成AND parser.setDefaultOperator(Operator.AND); // 开启第1个字符的通配查询,默许是关闭的,太消耗性能 parser.setAllowLeadingWildcard(true); // 搜索包括content中包括like的 Query query = parser.parse("like"); // 查询content中,basketball 和 basketball 的文档 query = parser.parse("basketball football"); // 改变搜索域 query = parser.parse("name:make"); // 用*或? 通配符匹配 query = parser.parse("name:j*"); // 通配符默许不能放在首位 query = parser.parse("email:*@itat.org"); // 查询 名字中没mike,content中like的。 +和- 必须要放在前面 query = parser.parse("- name:mike + like"); // 匹配1个区间,TO必须大写 query = parser.parse("id:[1 TO 6]"); // 开区间 query = parser.parse("id:{1 TO 3}"); /** * 查询字符串中空格的,加上“” 完全匹配 */ query = parser.parse(""I like football""); // 查询I和football中1个字符距离的 query = parser.parse(""I football"~1"); // 没办法匹配数字范围,必须要自定义 query = parser.parse("attach:[2 TO 10]"); // 模糊匹配 query = parser.parse("name:make~"); su.searchByQueryParse(query, 10); }

 这是对term(最小分词单元)的查询

/** * 备注:这里的精确匹配查询,是匹配索引文件中的词。 * 如果 是搜索英文,忽视大小写 * @param field * @param name * @param num */ public void searchByTerm(String field,String name,int num) { try { IndexSearcher searcher = getSearcher(); Query query = new TermQuery(new Term(field,name)); TopDocs tds = searcher.search(query, num); String[] path = FieldCache.DEFAULT.getStrings(reader, "name"); System.out.println(path.length); for(String p:path){ System.out.println(p); } System.out.println("查询总数:"+tds.totalHits); for(ScoreDoc sd:tds.scoreDocs) { //System.out.println(sd.score);-查询得分信息 Document doc = searcher.doc(sd.doc); System.out.println(doc.get("id")+"---->"+ doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+ doc.get("attach")+","+doc.get("date")); } searcher.close(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }
多值查询(BooleanQuery)可以用来连接多个子查询:

/** * 多值查询 * @param num */ public void searchByBoolean(int num) { try { IndexSearcher searcher = getSearcher(); BooleanQuery query = new BooleanQuery(); /* * BooleanQuery连接多值查询 * Occur.MUST表示必须出现 * Occur.SHOULD表示可以出现 * Occur.MUSE_NOT表示必须不能出现 */ query.add(new TermQuery(new Term("name","zhangsan")), Occur.MUST_NOT); query.add(new TermQuery(new Term("content","game")),Occur.SHOULD); TopDocs tds = searcher.search(query, num); System.out.println("命中数:"+tds.totalHits); for(ScoreDoc sd:tds.scoreDocs) { Document doc = searcher.doc(sd.doc); System.out.println(doc.get("id")+"---->"+ doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+ doc.get("attach")+","+doc.get("date")); } searcher.close(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }

 范围搜索(TermRangeQuery):

/** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub String dir = "D:user"; try { Directory directory = FSDirectory.open(new File(dir)); @SuppressWarnings("deprecation") IndexReader reader = IndexReader.open(directory); IndexSearcher indexSearcher = new IndexSearcher(reader); /** * 范围搜索 */ Term begin = new Term("datetime", "191111"); Term end = new Term("datetime", "198108"); /** * 参数Boolean值说明 false表示不包括 191111 true 表示包括198108 这两个Boolean表示查询结果 * 是不是包括lower,upper两个临界值 */ TermRangeQuery termRangeQuery = new TermRangeQuery("datetime", begin.bytes(), end.bytes(), false, true); TopDocs topDocs = indexSearcher.search(termRangeQuery, 10); ScoreDoc scoreDocs[] = topDocs.scoreDocs; for (int i = 0; i < scoreDocs.length; i++) { Document document = indexSearcher.doc(scoreDocs[i].doc); System.out.println(document.get("id")); System.out.println(document.get("name")); System.out.println(document.get("text")); System.out.println(document.get("datetime")); } directory.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }


数字范围查询:

public void searchByNumricRange(String field,int start,int end,int num) { try { IndexSearcher searcher = getSearcher(); Query query = NumericRangeQuery.newIntRange(field,start, end,true,true); TopDocs tds = searcher.search(query, num); System.out.println("命中数量:"+tds.totalHits); for(ScoreDoc sd:tds.scoreDocs) { Document doc = searcher.doc(sd.doc); System.out.println(doc.get("id")+"---->"+ doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+ doc.get("attach")+","+doc.get("date")); } searcher.close(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }

前缀搜索(PrefixQuery),注意也是对词的前缀搜索:

/** * 前缀搜索 * @param field * @param value * @param num */ public void searchByPrefix(String field,String value,int num) { try { IndexSearcher searcher = getSearcher(); Query query = new PrefixQuery(new Term(field,value)); TopDocs tds = searcher.search(query, num); System.out.println("命中数:"+tds.totalHits); for(ScoreDoc sd:tds.scoreDocs) { Document doc = searcher.doc(sd.doc); System.out.println(doc.get("id")+"---->"+ doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+ doc.get("attach")+","+doc.get("date")); } searcher.close(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }

通配符搜索(WildcardQuery)

/** * 通配符查询 ?和* * @param field * @param value * @param num */ public void searchByWildcard(String field,String value,int num) { try { IndexSearcher searcher = getSearcher(); //在传入的value中可使用通配符?和*,问号表示匹配1个字符,*表示匹配任意多个字符 Query query = new WildcardQuery(new Term(field,value)); TopDocs tds = searcher.search(query, num); System.out.println("1共命中数:"+tds.totalHits); for(ScoreDoc sd:tds.scoreDocs) { Document doc = searcher.doc(sd.doc); System.out.println(doc.get("id")+"---->"+ doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+ doc.get("attach")+","+doc.get("date")); } searcher.close(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }

短语查询(PhraseQuery),根据零碎的短语组合成新的词组进行搜索,1般利用于英文搜索中

public void searchByPhrase(int num) { try { IndexSearcher searcher = getSearcher(); PhraseQuery query = new PhraseQuery(); //设置跳数 query.setSlop(3); query.add(new Term("content","pingpeng")); //第1个Term query.add(new Term("content","i")); //产生距离以后的第1个Term // query.add(new Term("content","football")); TopDocs tds = searcher.search(query, num); System.out.println("命中数:"+tds.totalHits); for(ScoreDoc sd:tds.scoreDocs) { Document doc = searcher.doc(sd.doc); System.out.println(doc.get("id")+"---->"+ doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+ doc.get("attach")+","+doc.get("date")); } searcher.close(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }

模糊匹配(searchByFuzzy),允许有个别毛病的查询 

public void searchByFuzzy(int num) { try { IndexSearcher searcher = getSearcher(); //调剂类似读 FuzzyQuery query = new FuzzyQuery(new Term("name","mase"),0.4f,0); System.out.println(query.getPrefixLength()); System.out.println(query.getMinSimilarity()); TopDocs tds = searcher.search(query, num); for(ScoreDoc sd:tds.scoreDocs) { Document doc = searcher.doc(sd.doc); System.out.println(doc.get("id")+"---->"+ doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+ doc.get("attach")+","+doc.get("date")); } searcher.close(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }


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