用MultiSearcher在多索引中进行搜索

/**
     * 多索引进行查询
     */ 
    public void testCreateIndex() { 
        Analyzer analyzer = new IKAnalyzer(); 
        String atext ="明年起，杭州将对两区五县（市）居民发放市民卡，实现杭州市域范围医保“一卡通”凭卡就医。12月底，首批发卡工作将拉开帷幕"; 
        String btext ="搜索操作为每个Searchable分配一个线程市民卡，直到所有线程都完成其搜索。基本搜索和进行过滤的搜索是并行执行的"; 
         
        Directory a = new RAMDirectory(); 
        Directory b = new RAMDirectory(); 
         
        IndexWriter awriter; 
        IndexWriter bwriter; 
         
        IndexSearcher[] searchers; 
         
        try { 
            awriter = new IndexWriter(a, analyzer, true ,IndexWriter.MaxFieldLength.LIMITED); 
            Document adoc = new Document(); 
            adoc.add(new Field("aid", "1", Field.Store.YES,Field.Index.ANALYZED)); 
            adoc.add(new Field("doc",  atext, Field.Store.YES,Field.Index.ANALYZED)); 
            adoc.add(new Field("name", "张三", Field.Store.YES,Field.Index.NOT_ANALYZED)); 
            awriter.addDocument(adoc); 
            awriter.close(); 
             
            bwriter = new IndexWriter(b, analyzer, true ,IndexWriter.MaxFieldLength.LIMITED); 
            Document bdoc = new Document(); 
            bdoc.add(new Field("bid", "1", Field.Store.YES,Field.Index.ANALYZED)); 
            bdoc.add(new Field("doc",  btext, Field.Store.YES,Field.Index.ANALYZED)); 
            bdoc.add(new Field("name", "李四", Field.Store.YES,Field.Index.NOT_ANALYZED)); 
            bwriter.addDocument(bdoc); 
            bwriter.close(); 
             
            searchers = new IndexSearcher[2]; 
            searchers[0]=new IndexSearcher(a); 
            searchers[1]=new IndexSearcher(b); 
             
            MultiSearcher searcher=new MultiSearcher(searchers); 
            //对2个索引进行搜索 
 
            String[] fields =new String[]{"aid","doc","name"}; 
            Query query=IKQueryParser.parseMultiField(fields, "张三"); 
//            Query query=IKQueryParser.parse("doc", "市民卡"); 
            TopDocs topDocs = searcher.search(query, 200); 
            ScoreDoc[] hits = topDocs.scoreDocs; 
            for (int i = 0; i < hits.length; i++) { 
                Document doc = searcher.doc(hits[i].doc); 
                System.out.println("name:"+doc.get("name")); 
                System.out.println("aid:"+doc.get("aid")+"bid:"+doc.get("bid")); 
                System.out.println("doc:"+doc.get("doc")); 
            } 
            assertNotNull(topDocs); 
           
        } catch (CorruptIndexException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } catch (LockObtainFailedException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
        
//        List<User> userList = userService.getUserList(); 
//        userIndexService.createIndex(userList); 
    }