分页查询

 1     /**
 2      * 通过再搜索的方式进行分页
 3      * @param key                ：查询关键字
 4      * @param pageIndex    ：当前页索引
 5      * @param pageSize        ：每页记录数
 6      */
 7     public void searchAgain(String key, int pageIndex,int pageSize){
 8         IndexReader reader= null;
 9         IndexSearcher searcher = null;
10         
11         try{
12             //获取Reader
13             reader = util.getReader(getDirectory(path));
14                 
15             //获取Searcher
16             searcher = new IndexSearcher(reader);    
17             
18             //获取Query
19             QueryParser parser = new QueryParser(version,"content",new StandardAnalyzer(version));    
20             Query query = parser.parse(key);
21             
22             //获取TopDocs
23             TopDocs td =     searcher.search(query, 500);
24             System.out.println("总结查询到" + td.totalHits + "条数据");
25             
26             //获取ScoreDoc
27             ScoreDoc[] sds = td.scoreDocs;
28             
29             //显示条目
30             //起始索引
31             int start = (pageIndex -1) * pageSize;
32             //结束索引
33             int end = pageSize * pageIndex;
34             
35             //从查询结果中进行截取
36             for(int i = start;i<end;i++){
37                 Document doc = searcher.doc(sds[i].doc);
38                 
39                 System.out.println(i + "、" + doc.get("filename") + " == " + doc.get("size") + " == " + doc.get("modifydate") + "  == " + doc.get("path"));
40             }
41         }
42         catch(Exception e){
43             e.printStackTrace();
44         }
45         finally{
46             try {
47                 searcher.close();
48             } catch (IOException e) {
49                 // TODO Auto-generated catch block
50                 e.printStackTrace();
51             }
52         }
53         System.out.println("再查询结束");
54     }

 1     /**
 2      * 获取上一页的最后一个元素
 3      * @param query
 4      * @param searcher
 5      * @param index
 6      * @param size
 7      * @return
 8      */
 9     public ScoreDoc getLastDoc(Query query, IndexSearcher searcher, int index, int size){
10         if(index == 1)
11             return null;
12         
13         //当前页的第一个条目的索引（id）
14         int  total = (index - 1) * size;
15     
16         try {
17             //查询上一页的所有条目
18             TopDocs td = searcher.search(query, total);
19             
20             //返回最后一个元素
21             return td.scoreDocs[total-1];
22         } catch (IOException e) {
23             // TODO Auto-generated catch block
24             e.printStackTrace();
25             return null;
26         }
27     }

 1     /**
 2      * 使用searchAfter()实现搜索
 3      * @param key
 4      */
 5     public void searchByAfter(String key,int pageIndex,int pageSize){
 6         IndexReader reader= null;
 7         IndexSearcher searcher = null;
 8         
 9         try{
10             //获取Reader
11             reader = util.getReader(getDirectory(path));
12                 
13             //获取Searcher
14             searcher = new IndexSearcher(reader);    
15             
16             //获取Query
17             QueryParser parser = new QueryParser(version,"content",new StandardAnalyzer(version));    
18             Query query = parser.parse(key);
19             
20             ScoreDoc after = getLastDoc(query,searcher,pageIndex, pageSize);
21             TopDocs td = searcher.searchAfter(after, query, pageSize);
22             ScoreDoc[] sds = td.scoreDocs;
23             
24             /*
25             //获取TopDocs
26             TopDocs td =     searcher.search(query, 500);
27             System.out.println("总结查询到" + td.totalHits + "条数据");
28                         
29             //获取ScoreDoc
30             ScoreDoc[] sds = td.scoreDocs;
31             //查询第1页
32             //searchAfter(下一页的第一个条目)
33             //td = searcher.searchAfter(null,query,10);
34             //查询第2页
35             td = searcher.searchAfter(sds[10],query, 10);
36             
37             //获取ScoreDoc
38             sds = td.scoreDocs;
39             */
40             //从查询结果中进行截取
41             int i = 1;
42             for(ScoreDoc sd : sds){
43                 Document doc = searcher.doc(sd.doc);
44                 
45                 System.out.println(i + "、" + doc.get("filename") + " == " + doc.get("size") + " == " + doc.get("modifydate") + "  == " + doc.get("path"));
46                 i++;
47             }
48         }
49         catch(Exception e){
50             e.printStackTrace();
51         }
52         finally{
53             try {
54                 searcher.close();
55             } catch (IOException e) {
56                 // TODO Auto-generated catch block
57                 e.printStackTrace();
58             }
59         }
60         System.out.println("再查询结束");
61     }