File Name after donwload from BLOB

dear experts,
i'm a newbie in programming, just started this month.. i got problem where after i download from blob (oracle) the file name will be the same as the java class that i use to download it. How can i make the file name as it real file name rather than the java class name
For your information i use oreilly package to upload and for download i use other source code i take from internet example.

some of the code in download java class.. i use servlet...
public void doPost(....
ServletOutputStream out = response.getOutputStream();
     response.setContentType(dm_file1contenttype);
     out.write(getBlob(id));
     out.flush();
     out.close();
public byte[] getBlob(String id) {
while (rs.next()) {
          blob = rs.getBlob(1);
          bytes = blob.getBytes(1, (int) (blob.length()));
          conn.close();

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File Name after donwload from BLOB

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