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自定义评分

步骤

第一步：创建类并继承自CustomScoreQuery
第二步：实现类的相应的构造函数
第三步：重写getCustomScoreProvider()方法
第四步：创建类并继承自CustomScoreProvider
第五步：实现自定义类的构造函数
第六步：重写getCustomScore()方法

【示例】

 1 /**
 2  * 自定义评分查询器
 3  * @author Terry
 4  *
 5  */
 6 public class BookScoreQuery  extends CustomScoreQuery{
 7 
 8     /**
 9      * 实现相应的构造函数
10      * @param subQuery
11      */
12     public BookScoreQuery(Query subQuery) {
13         super(subQuery);
14         System.out.println("yes");
15     }
16 
17     /**
18      * 实现getCustomScoreProvider()方法
19      */
20     @Override
21     protected CustomScoreProvider getCustomScoreProvider(IndexReader reader)
22             throws IOException {
23         // TODO Auto-generated method stub
24         //return super.getCustomScoreProvider(reader);
25         return new BookScoreProvider(reader);
26     }
27 }

 1 /**
 2  * 实现自定义评分
 3  * @author Terry
 4  *
 5  */
 6 public class BookScoreProvider extends CustomScoreProvider{
 7 
 8     public BookScoreProvider(IndexReader reader) {
 9         super(reader);
10     }
11 
12     /**
13      * 自定义评分
14      *     参数1：文档的索引Id
15      * 参数2：文档的评分
16      * 参数3：其他评分域
17      */
18     @Override
19     public float customScore(int doc, float subQueryScore, float valSrcScore)
20             throws IOException {
21         //return super.customScore(doc, subQueryScore, valSrcScore);
22         //修改评分标准
23         return subQueryScore + (float)Math.random();
24     }
25 }
26     /**
27      * 按照指定的排序方式进行排序
28      * @param key
29      * @param sort
30      */
31     public void search(String key){
32         IndexReader reader =null;
33         IndexSearcher searcher = null;
34         
35         try{
36             //1、创建reader对象
37             reader = util.getReader(FSDirectory.open(new File(path)));
38             
39             //2、创建Searcher对象
40             searcher = util.getSeacher(reader);
41             
42             //3、创建Query
43             Query query = new TermQuery(new Term("content",key));
44             
45             //创建valSrcQuery对象
46             
47             //应用自定义ScoreQuery
48             BookScoreQuery scoreQuery = new BookScoreQuery(query);
49             
50             //4、获取TopDocs
51             TopDocs tds =searcher.search(scoreQuery, 100);
52             
53             
54             //5、获取ScoreDoc
55             ScoreDoc[] sds = tds.scoreDocs;
56             
57             SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
58             //6、处理数据
59             for(ScoreDoc sd : sds){
60                 Document doc =searcher.doc(sd.doc);
61                 
62                 System.out.println(sd.doc + "、(" + sd.score + " | "+doc.get("score2")+")" + 
63                         " **【" +doc.get("filename") + " ** " + doc.get("size")+ " ** " + 
64                         sdf.format(new Date(Long.parseLong(doc.get("modifydate"))))+ " ** " + doc.get("path")+"】");
65             }
66         }
67         catch(Exception e){
68             e.printStackTrace();
69         }
70         finally{
71             try {
72                 searcher.close();
73             } catch (IOException e) {
74                 // TODO Auto-generated catch block
75                 e.printStackTrace();
76             }
77         }
78     }

【自定义评分】

 1 /**
 2  * 扩展名查询器
 3  * @author Terry
 4  *
 5  */
 6 public class ExtScoreQuery extends CustomScoreQuery{
 7 
 8     public ExtScoreQuery(Query subQuery) {
 9         super(subQuery);        
10     }
11 
12     @Override
13     protected CustomScoreProvider getCustomScoreProvider(IndexReader reader)
14             throws IOException {
15         //return super.getCustomScoreProvider(reader);
16         return new ExtScoreProvider(reader);
17     }
18 }

 1 /**
 2  * 实现自定义评分类
 3  * @author Terry
 4  *
 5  */
 6 class ExtScoreProvider extends CustomScoreProvider{
 7     private String names[] = null;
 8     
 9     public ExtScoreProvider(IndexReader reader) {
10         super(reader);
11         
12         try {
13             //获取文件名列表
14             names = FieldCache.DEFAULT.getStrings(reader, "filename");
15         } catch (IOException e) {
16             // TODO Auto-generated catch block
17             e.printStackTrace();
18         }
19     }
20 
21     /**
22      * ini、dat后缀名的文件评分+10
23      * 其他后缀名的文件评分呢-.5
24      */
25     @Override
26     public float customScore(int doc, float subQueryScore, float valSrcScore)
27             throws IOException {
28         
29         if(names != null && names.length>0){
30             //获取当前文件名
31             String name = names[doc];
32             
33             //判断文件的后缀名是否为.ini或.dat
34             if(name.endsWith(".ini") || name.endsWith(".dat"))
35                 return subQueryScore +10;
36         }
37         
38         return subQueryScore -.5f;
39         //return super.customScore(doc, subQueryScore, valSrcScore);
40     }
41     
42 }

 1     /**
 2      * 按照指定的排序方式进行排序
 3      * @param key
 4      * @param sort
 5      */
 6     public void search(String key){
 7         IndexReader reader =null;
 8         IndexSearcher searcher = null;
 9         
10         try{
11             //1、创建reader对象
12             reader = util.getReader(FSDirectory.open(new File(path)));
13             
14             //2、创建Searcher对象
15             searcher = util.getSeacher(reader);
16             
17             //3、创建Query
18             Query query = new TermQuery(new Term("content",key));
19             
20             //创建valSrcQuery对象
21             
22             //应用自定义ScoreQuery
23             //BookScoreQuery scoreQuery = new BookScoreQuery(query);
24             ExtScoreQuery scoreQuery = new ExtScoreQuery(query);
25             
26             //4、获取TopDocs
27             TopDocs tds =searcher.search(scoreQuery, 100);
28             
29             
30             //5、获取ScoreDoc
31             ScoreDoc[] sds = tds.scoreDocs;
32             
33             SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
34             //6、处理数据
35             for(ScoreDoc sd : sds){
36                 Document doc =searcher.doc(sd.doc);
37                 
38                 System.out.println(sd.doc + "、(" + sd.score + " | "+doc.get("score2")+")" + 
39                         " **【" +doc.get("filename") + " ** " + doc.get("size")+ " ** " + 
40                         sdf.format(new Date(Long.parseLong(doc.get("modifydate"))))+ " ** " + doc.get("path")+"】");
41             }
42         }
43         catch(Exception e){
44             e.printStackTrace();
45         }
46         finally{
47             try {
48                 searcher.close();
49             } catch (IOException e) {
50                 // TODO Auto-generated catch block
51                 e.printStackTrace();
52             }
53         }
54     }

【自定义parser】

默认情况下Lucene支持WildCarQuery、FuzzyQuery等多种不同的搜索方式。但是其中部分搜索方式的搜索效率较低，实际使用时可能会被禁止使用。

【示例】

 1 /**
 2  * 创建自定义Parser
 3  * @author Terry
 4  *
 5  */
 6 public class MyParser extends QueryParser{
 7 
 8     //实现Parser的构造函数
 9     public MyParser(Version matchVersion, String f, Analyzer a) {
10         super(matchVersion, f, a);
11         
12         System.out.println("MyParser被实例化了......");
13     }
14 
15     /**
16      * 重写getWildcardQuery()方法
17      */
18     @Override
19     protected org.apache.lucene.search.Query getWildcardQuery(String field,
20             String termStr) throws ParseException {
21         //System.out.println("getWildcardQuery()方法被调用了......");
22         //return super.getWildcardQuery(field, termStr);
23         
24         throw new ParseException("系统目前不支持通配符查询，请使用精确搜索");
25     }
26 
27     /**
28      * 重写getFuzzyQuery()
29      */
30     @Override
31     protected org.apache.lucene.search.Query getFuzzyQuery(String field,
32             String termStr, float minSimilarity) throws ParseException {
33         // TODO Auto-generated method stub
34         //return super.getFuzzyQuery(field, termStr, minSimilarity);
35         throw new ParserException("目前不支持模糊查询，请使用精准搜索");
36     }
37 
38     @Override
39     public String toString() {
40         return "MyParser [toString()=" + super.toString() + "]";
41     }
42     
43 }

 1     /**
 2      * 按照指定的排序方式进行排序
 3      * @param key
 4      * @param sort
 5      */
 6     public void search(String key){
 7         IndexReader reader =null;
 8         IndexSearcher searcher = null;
 9         
10         try{
11             //1、创建reader对象
12             reader = util.getReader(FSDirectory.open(new File(path)));
13             
14             //2、创建Searcher对象
15             searcher = util.getSeacher(reader);
16             
17             //3、创建Query
18             //QueryParser parser = new QueryParser(util.VERSION,"content",new StandardAnalyzer(util.VERSION));
19             QueryParser parser = new MyParser(util.VERSION,"content",new StandardAnalyzer(util.VERSION));
20             Query query = parser.parse(key);
21             
22             System.out.println(parser.toString());
23             
24             //4、获取TopDocs
25             TopDocs tds =searcher.search(query, 100);
26             
27             
28             //5、获取ScoreDoc
29             ScoreDoc[] sds = tds.scoreDocs;
30             
31             SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
32             //6、处理数据
33             for(ScoreDoc sd : sds){
34                 Document doc =searcher.doc(sd.doc);
35                 
36                 System.out.println(sd.doc + "、(" + sd.score + " | "+doc.get("score2")+")" + 
37                         " **【" +doc.get("filename") + " ** " + doc.get("size")+ " ** " + 
38                         sdf.format(new Date(Long.parseLong(doc.get("modifydate"))))+ " ** " + doc.get("path")+"】");
39             }
40         }
41         catch(Exception e){
42             System.out.println(e.getMessage());
43         }
44         finally{
45             try {
46                 searcher.close();
47             } catch (IOException e) {
48                 // TODO Auto-generated catch block
49                 e.printStackTrace();
50             }
51         }
52     }

 1     @Test
 2     public void test01(){
 3         ParserUtil util = new ParserUtil();
 4         //通配符查询。
 5         //util.search("content:about????");
 6         //不支持，需要修改属性
 7         //util.search("*about");
 8         //util.search("abount");
 9         //模糊查询
10         util.search("about~");
11     }

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原文地址：https://www.cnblogs.com/zhzcode/p/9863077.html