首页 > 代码库 > lucene查询索引之解析查询——(八)

lucene查询索引之解析查询——(八)

0.语法介绍:

技术分享

 

技术分享

技术分享

 

 

1.公共部分代码同七中一样

 

// IndexReader IndexSearcher    public IndexSearcher getIndexSearcher() throws Exception {        // 第一步:创建一个Directory对象,也就是索引库存放的位置。        Directory directory = FSDirectory.open(new File("E:\\lucene&solr\\index"));// 磁盘        // 第二步:创建一个indexReader对象,需要指定Directory对象。        IndexReader indexReader = DirectoryReader.open(directory);        // 第三步:创建一个indexsearcher对象,需要指定IndexReader对象        return new IndexSearcher(indexReader);    }    // 执行查询的结果    public void printResult(IndexSearcher indexSearcher, Query query) throws Exception {        // 第五步:执行查询。        TopDocs topDocs = indexSearcher.search(query, 10);        // 第六步:返回查询结果。遍历查询结果并输出。        ScoreDoc[] scoreDocs = topDocs.scoreDocs;        for (ScoreDoc scoreDoc : scoreDocs) {            int doc = scoreDoc.doc;            Document document = indexSearcher.doc(doc);            // 文件名称            String fileName = document.get("fileName");            System.out.println(fileName);            // 文件内容            String fileContent = document.get("fileContent");            System.out.println(fileContent);            // 文件大小            String fileSize = document.get("fileSize");            System.out.println(fileSize);            // 文件路径            String filePath = document.get("filePath");            System.out.println(filePath);            System.out.println("------------");        }    }

 

2.查询所有:(分析器会对查询条件进行分词)

   语法:   *:*

// 条件解释的对象查询    @Test    public void testQueryParser() throws Exception {        IndexSearcher indexSearcher = getIndexSearcher();        // 参数1: 默认查询的域        // 参数2:采用的分析器        QueryParser queryParser = new QueryParser("fileName", new IKAnalyzer());        // *:* 域:值        Query query = queryParser.parse("* : *");        printResult(indexSearcher, query);        // 关闭资源        indexSearcher.getIndexReader().close();    }

 

 

3.使用默认查询的域

  查询名字带有computer索引的文档

@Test    public void testQueryParser() throws Exception {        IndexSearcher indexSearcher = getIndexSearcher();        // 参数1: 默认查询的域        // 参数2:采用的分析器        QueryParser queryParser = new QueryParser("fileName", new IKAnalyzer());        // *:* 域:值        Query query = queryParser.parse("computer");        printResult(indexSearcher, query);        // 关闭资源        indexSearcher.getIndexReader().close();    }

 

结果:

加载扩展词典:ext.dic加载扩展停止词典:stopword.diccomputer.txt??Computers are changing our life. You can do a lot of things with a computer. Such as, you can use a computer to write articles, watch video CDs, play games and do office work. But the most important use of a computer is to join the Internet.We don??t need to leave home to borrow books from a library or to do shopping in a supermarke336E:\lucene&solr\searchfiles\computer.txt------------

 

 

4.范围查询

  不支持范围查询

5.组合查询(组合查询只用修改语法,+表示必须,-表示必须没有,啥也没有表示可有可无)

  查询fileName必须带有Java,且必须不带struts的文档。

  语法  +fileName:java -fileName:struts

// 条件解释的对象查询    @Test    public void testQueryParser() throws Exception {        IndexSearcher indexSearcher = getIndexSearcher();        // 参数1: 默认查询的域        // 参数2:采用的分析器        QueryParser queryParser = new QueryParser("fileName", new IKAnalyzer());        // *:* 域:值        Query query = queryParser.parse("+fileName:java -fileName:struts");        printResult(indexSearcher, query);        // 关闭资源        indexSearcher.getIndexReader().close();    }

 

结果:

加载扩展词典:ext.dic加载扩展停止词典:stopword.dicjava 基础.txt think smiling is as important as sunshine. Smiling is like sunshine because it can make people happy and have a good day. If you aren??t happy, you can smile, and then you will feel happy. Someone may say, ??But I don??t feel happy.?? Then I would say, ??Please smile as you do when you are happy or play wit309E:\lucene&solr\searchfiles\java 基础.txt------------java高级.txt????java?????????????????????32E:\lucene&solr\searchfiles\java高级.txt------------

 

 

6.复杂查询

  查询 fileName 带有javaweb 或者 computer的,或者是fileContent带有javaweb 或者 computer的

  IKAnalyzer分析器先对java is apach进行分词,然后对javaweb is computer进行分词,然后根据条件进行查询带有分析器分词后的词的文档。
// 条件解释的对象查询    @Test    public void testQueryParser() throws Exception {        IndexSearcher indexSearcher = getIndexSearcher();        // 参数1: 默认查询的域        // 参数2:采用的分析器        QueryParser queryParser = new QueryParser("fileName", new IKAnalyzer());        // *:* 域:值        Query query = queryParser.parse("fileName:javaweb is computer OR fileContent:javaweb is computer ");        printResult(indexSearcher, query);        // 关闭资源        indexSearcher.getIndexReader().close();    }

 

 


结果:

加载扩展词典:ext.dic加载扩展停止词典:stopword.diccomputer.txt??Computers are changing our life. You can do a lot of things with a computer. Such as, you can use a computer to write articles, watch video CDs, play games and do office work. But the most important use of a computer is to join the Internet.We don??t need to leave home to borrow books from a library or to do shopping in a supermarke336E:\lucene&solr\searchfiles\computer.txt------------1javaweb .txtthis is javaweb dsbadfsabjkfsdf njdfndsj njaj spring 53E:\lucene&solr\searchfiles\1javaweb .txt------------

 

 

 --------------------条件解析的对象查询 多个默念域-----------------------

7.解析器用 MultiFieldQueryParser

  查询 fileName 带有javaweb 或者 computer的,或者是fileContent带有javaweb 或者 computer的(与6的作用等价)

  作用不大,在查询条件中一用上查询域默认查询域就废了。

// 条件解析的对象查询 多个默念域    @Test    public void testMultiFieldQueryParser() throws Exception {        IndexSearcher indexSearcher = getIndexSearcher();        String[] fields = { "fileName", "fileContent" };        // 参数1: 默认查询的域        // 参数2:采用的分析器        MultiFieldQueryParser queryParser = new MultiFieldQueryParser(fields, new IKAnalyzer());        // *:* 域:值        Query query = queryParser.parse("javaweb is computer");        printResult(indexSearcher, query);        // 关闭资源        indexSearcher.getIndexReader().close();    }

 

 

 

 

总结:

  这个可以将查询条件设置为句子,IKAnalyzer分析器会对句子进行分词处理,然后进行查询索引。

  

 // 参数1: 默认查询的域        // 参数2:采用的分析器        QueryParser queryParser = new QueryParser("fileName", new IKAnalyzer());        // *:* 域:值        Query query = queryParser.parse("fileName:java is apache OR fileContent:Computers are changing our life ");

 

lucene查询索引之解析查询——(八)