How to avoid the pdf file in browser cache

i am opening pdf files through browser. After that same pdf changed their contents . after i open the pdf but it will not updated. Bcoz this file in cache . so how to avoid the cache store for pdf files.
plz help me!!!

the code is as bellow
File fBlob = new File ("test.pdf");
FileInputStream fIS = new FileInputStream(fBlob);
pstUpdate= con.prepareStatement("UPDATE table set file = ? where id = ?");
pstUpdate.setBinaryStream(1, fIS, (int) fBlob.length());
pstUpdate.setString(2, rs.getString("id"));
pstUpdate.execute();
con.commit();

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