lucene入门查询索引——（三）

1.用户接口(lucene不提供)

2.创建查询

3.执行查询

4.渲染结果:

5.过程分析

根据关键字查询索引库中的内容：

1）  创建IndexSearcher对象

2）  创建QueryParser对象

3）  创建Query对象来封装关键字

4）  用IndexSearcher对象去索引库中查询符合条件的前100条记录，不足100条记录的以实际为准

5）  获取符合条件的编号

6）  用indexSearcher对象去索引库中查询编号对应的Document对象

7）  将Document对象中的所有属性取出，再封装回JavaBean对象中去，并加入到集合中保存，以备将之用

 IndexSearcher对象搜索方法:

6.代码实现:

 1     // 搜索索引
 2     @Test
 3     public void testSearch() throws Exception {
 4         // 第一步：创建一个Directory对象，也就是索引库存放的位置。
 5         Directory directory = FSDirectory.open(new File("E:\\lucene&solr\\index"));// 磁盘
 6         // 第二步：创建一个indexReader对象，需要指定Directory对象。
 7         IndexReader indexReader = DirectoryReader.open(directory);
 8         // 第三步：创建一个indexsearcher对象，需要指定IndexReader对象
 9         IndexSearcher indexSearcher = new IndexSearcher(indexReader);
10         // 第四步：创建一个TermQuery对象，指定查询的域和查询的关键词。
11         Query query = new TermQuery(new Term("fileName", "java"));
12         // 第五步：执行查询。
13         TopDocs topDocs = indexSearcher.search(query, 10);
14         // 第六步：返回查询结果。遍历查询结果并输出。
15         ScoreDoc[] scoreDocs = topDocs.scoreDocs;
16         for (ScoreDoc scoreDoc : scoreDocs) {
17             int doc = scoreDoc.doc;
18             Document document = indexSearcher.doc(doc);
19             // 文件名称
20             String fileName = document.get("fileName");
21             System.out.println(fileName);
22             // 文件内容
23             String fileContent = document.get("fileContent");
24             System.out.println(fileContent);
25             // 文件大小
26             String fileSize = document.get("fileSize");
27             System.out.println(fileSize);
28             // 文件路径
29             String filePath = document.get("filePath");
30             System.out.println(filePath);
31             System.out.println("------------");
32         }
33         // 第七步：关闭IndexReader对象
34         indexReader.close();
35
36     }

结果:

java struts.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 wit
309
E:\lucene1\searchfiles\java struts.txt
------------
java struts - .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 wit
309
E:\lucene&solr\searchfiles\java struts - .txt
------------
java struts.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 wit
309
E:\lucene&solr\searchfiles\java struts.txt
------------
java struts  springmvc.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 wit
309
E:\lucene&solr\searchfiles\java struts  springmvc.txt
------------
java struts spring.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 wit
309
E:\lucene&solr\searchfiles\java struts spring.txt
------------

将上面的第五步的

 TopDocs topDocs = indexSearcher.search(query, 10); 改为 TopDocs topDocs = indexSearcher.search(query, 2);

结果:只输出查到的两条记录

java struts.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 wit
309
E:\lucene1\searchfiles\java struts.txt
------------
java struts - .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 wit
309
E:\lucene&solr\searchfiles\java struts - .txt
------------