/*** 构造IndexSearcher对象** @return* @throws Exception*/private IndexSearcher getIndexSearcher() throws Exception {/*创建一个Directory对象，指定索引库的位置*/Directory directory = FSDirectory.open(new File("E:\\zhanghaoBF\\luceneSolr\\indexLibrary").toPath());//磁盘（硬盘）上的路径/*创建一个IndexReader（索引读取）对象*/IndexReader indexReader = DirectoryReader.open(directory);//打开索引库(此对象为流对象)/*创建一个IndexSearcher(索引搜索)对象*/IndexSearcher indexSearcher = new IndexSearcher(indexReader);return indexSearcher;//索引对象
    }/*** 执行查询并打印结果** @param query* @param indexSearcher* @throws Exception*/private void printResult(Query query, IndexSearcher indexSearcher) throws Exception {/*执行查询*/TopDocs topDocs = indexSearcher.search(query, 10);//根据query搜索，返回评分最高的10条/*返回查询结果，遍历查询结果并输出*/ScoreDoc[] scoreDocs = topDocs.scoreDocs;//PS：注意这里返回的是文档id的数组for (ScoreDoc scoreDoc : scoreDocs) {int docId = scoreDoc.doc;//文档IDDocument document = indexSearcher.doc(docId);//对应的文档
String fileName = document.get("fileName");//文件名称
            System.out.println(fileName);String fileSize = document.get("fileSize");//文件大小
            System.out.println(fileSize);String filePath = document.get("filePath");//文件路径
            System.out.println(filePath);System.out.println("----------华丽的分割线----------");}}

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    /*** 查询索引目录下的所有文档** @throws Exception*/@Testpublic void testMatchAllDocsQuery() throws Exception {//获取IndexSearcher（索引搜索）对象IndexSearcher indexSearcher = getIndexSearcher();//新建查询子类对象Query query = new MatchAllDocsQuery();//执行查询并打印结果
        printResult(query, indexSearcher);}

    /*** 对指定的域和关键词进行精准查询** @throws Exception*/@Testpublic void testTermQuery() throws Exception {//获取IndexSearcher（索引搜索）对象IndexSearcher indexSearcher = getIndexSearcher();//构造查询条件Term condition = new Term("fileContent", "lucene");//新建查询子类对象Query query = new TermQuery(condition);//执行查询并打印结果
        printResult(query, indexSearcher);}

    /*** 根据数值范围查询** @throws Exception*/@Testpublic void testNumericRangQuery() throws Exception {//获取IndexSearcher（索引搜索）对象IndexSearcher indexSearcher = getIndexSearcher();//新建查询子类对象(老版本用的是NumericRangQuery)Query query = LongPoint.newRangeQuery("fileSize", 1L, 200L);//查询长度在1-200之间的索引文档id数组//执行查询并打印结果
        printResult(query, indexSearcher);}

 /*** 组合查询（多条件查询）** BooleanClause.Occur.MUST（必须满足此条件）【相当于sql中的and】* BooleanClause.Occur.SHOULD（可以满足也可以不满足）【相当于sql中的or】* BooleanClause.Occur.MUST_NOT（必须不满足此条件）【相当于sql中的not】** @throws Exception*/@Testpublic void testBooleanQuery() throws Exception {//获取IndexSearcher（索引搜索）对象IndexSearcher indexSearcher = getIndexSearcher();//构造查询条件Query query1 = new TermQuery(new Term("fileName", "lucene"));Query query2 = new TermQuery(new Term("fileContent", "lucene"));//新建查询子类对象(老版本不用指定builder，可以直接new出BooleanQuery对象后直接添加query条件)BooleanQuery.Builder builder = new BooleanQuery.Builder();builder.add(query1, BooleanClause.Occur.MUST);builder.add(query2, BooleanClause.Occur.MUST);BooleanQuery booleanQuery = builder.build();//执行查询并打印结果
        printResult(booleanQuery, indexSearcher);}