IndexReader index1 = IndexReader.open(dir1);
IndexReader index2 = IndexReader.open(dir2);
IndexReader index3 = IndexReader.open(dir3);
...
IndexReader all = new MultiReader(index1, index2, index3,...);
IndexSearcher searcher = new IndexSearcher(all);

...search your indexes...

all.close();
index1.close();
index2.close();
index3.close();
...


-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: u...@thetaphi.de

> -----Original Message-----
> From: Cheng [mailto:zhoucheng2...@gmail.com]
> Sent: Thursday, June 23, 2011 4:19 PM
> To: java-user@lucene.apache.org
> Subject: Search multiple directories simultaneously
> 
> Hi,
> 
> I have multiple indexed folders (or directories), each holding indexing
files
> for specific purposes. I want to do a search over these folders (or
> directories) in a same query.
> 
> Is it possible?
> 
> Thanks


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