Lucene 从多个索引上搜索

事实上，在一些商业系统中，索引并非只存放在一个目录中，这样我们就要求将几个目录的索引进行一起查询。

代码：

 public static void main(String[] args) {
  try {
   /*File file1 = new File("d://test1");
   File file2 = new File("d://test2");
   Analyzer luceneAnalyzer = new StandardAnalyzer();
   IndexWriter writer1 = new IndexWriter(file1, luceneAnalyzer, true);
   writer1.setUseCompoundFile(false);
   IndexWriter writer2 = new IndexWriter(file2, luceneAnalyzer, true);
   writer2.setUseCompoundFile(false);
   
   Document doc1 = new Document();
   Document doc2 = new Document();
   
   Field f1 = new Field("bookname","钢铁是怎样炼成的",Field.Store.YES,Field.Index.TOKENIZED);
   Field f2 = new Field("price","26",Field.Store.YES,Field.Index.TOKENIZED);
   
   doc1.add(f1);
   doc1.add(f2);
   
   
   Field f3 = new Field("bookname","我的中华",Field.Store.YES,Field.Index.TOKENIZED);
   Field f4 = new Field("price","20",Field.Store.YES,Field.Index.TOKENIZED);
   doc2.add(f3);
   doc2.add(f4);
   
   writer1.addDocument(doc1);
   writer2.addDocument(doc2);
   
   writer1.close();
   writer2.close();*/
   

//创建查询的内容，包装成一个数组。
   String query1 = "钢";
   String query2 = "[10 TO 30]";
   String[] queries = {query1,query2};
   

 

//创建查询的field，包装成一个数组。
   String field1 = "bookname";
   String field2 = "price";
   String[] fields = {field1,field2};
   BooleanClause.Occur[] clause = {BooleanClause.Occur.MUST,BooleanClause.Occur.MUST};
   
   Query q = MultiFieldQueryParser.parse(queries, fields, clause,new StandardAnalyzer());
   
   System.out.println(q.toString());
   

 

//从所要查询的索引位置建立IndexSearcher
   IndexSearcher search1 = new IndexSearcher("d://test1");
   IndexSearcher search2 = new IndexSearcher("d://test2");
   
   IndexSearcher[] searchers = {search1,search2};
   
   MultiSearcher searcher = new MultiSearcher(searchers);
   
   Hits hits = searcher.search(q);
   for(int i=0;i<hits.length();i++)
   {
    System.out.println(hits.doc(i));
   }
   
   
   
  } catch (Exception e) {
   e.printStackTrace();
  }

 }