Lucene初体验——Hello Word实现

Posted 2020-10-25 Aiden郭祥跃

1、创建索引

 1 /**
 2      * 建立索引
 3      */
 4     public void index(){
 5         IndexWriter writer=null;
 6         try {
 7             //1.创建Directory
 8             //Directory directory=new RAMDirectory();//建立在内存中
 9             Directory directory=FSDirectory.open(new File("D:/lucene/lucene01"));//创建在硬盘上
10             //2.创建IndexWrite
11             IndexWriterConfig iwc=new IndexWriterConfig(Version.LUCENE_35,new StandardAnalyzer(Version.LUCENE_35));
12             writer=new IndexWriter(directory, iwc);
13             //3.创建Document对象
14             Document doc=null;
15             //4.为Document添加Field
16             File f=new File("D:/lucene/example");
17             for (File file:f.listFiles()) {
18                 doc=new Document();
19                 doc.add(new Field("content",new FileReader(file)));
20                 doc.add(new Field("filename",file.getName(),Field.Store.YES,Field.Index.NOT_ANALYZED));
21                 doc.add(new Field("path",file.getAbsolutePath(),Field.Store.YES,Field.Index.NOT_ANALYZED));
22                 //5.通过Index Writer添加文档到索引中
23                 writer.addDocument(doc);
24             }
25 
26 
27 
28         } catch (IOException e) {
29             // TODO Auto-generated catch block
30             e.printStackTrace();
31         }finally{
32             if(writer!=null){
33                 try {
34                     writer.close();
35                 } catch (IOException e) {
36                     // TODO Auto-generated catch block
37                     e.printStackTrace();
38                 }
39             }
40         }
41 
42     }

2、搜索

 1 /***
 2      * 搜索
 3      */
 4     public void searcher(){
 5         try {
 6             //1.创建Directory
 7             Directory directory=FSDirectory.open(new File("D:/lucene/lucene01"));//创建在硬盘上
 8             //2.创建IndexReader
 9             IndexReader reader=IndexReader.open(directory);
10             //3.根据IndexReader创建IndexSearcher
11             IndexSearcher searcher=new IndexSearcher(reader);
12             //4.创建搜索的Query
13             //创建parser来确定要搜索文件的内容，第二个参数表示搜索的域
14             QueryParser parser=new QueryParser(Version.LUCENE_35, "content", new StandardAnalyzer(Version.LUCENE_35));
15             //创建query，表示搜索域为content中包含Java的文档
16             Query query=parser.parse("migrate");
17             //5.根据searcher搜索并且返回TopDocs
18             //10 搜索条数
19             TopDocs tds=searcher.search(query, 10);
20             //6.根据TopDocs获取ScoreDoc对象
21             ScoreDoc[] sds= tds.scoreDocs;
22             for (ScoreDoc sd : sds) {
23                 //7.根据searcher和ScoreDoc对象获取具体的document对象
24                 Document d=searcher.doc(sd.doc);
25                 //8.根据Document对象获取需要的值
26                 System.out.println(d.get("filename")+"["+d.get("path")+"]");
27             }
28             
29             
30             //9.关闭reader
31             reader.close();
32         } catch (CorruptIndexException e) {
33             // TODO Auto-generated catch block
34             e.printStackTrace();
35         } catch (IOException e) {
36             // TODO Auto-generated catch block
37             e.printStackTrace();
38         } catch (ParseException e) {
39             // TODO Auto-generated catch block
40             e.printStackTrace();
41         }
42     }

3、Junit测试

 1         @Test
 2     public void testIndex(){
 3         HelloLucene hl=new HelloLucene();
 4         hl.index();
 5     }
 6     
 7     @Test
 8     public void testSearch(){
 9         HelloLucene hl=new HelloLucene();
10         hl.searcher();
11     }