例子如下:String sqlStr = "SELECT bx from rowTestTable where fileName='" + fileName + "'";
      ResultSet rset = stmt.executeQuery(sqlStr);
      if(rset.next())
      {
        InputStream inStream = rset.getBinaryStream("detail");//建立输入流,并将字段bx的值以流的形式,放入inStream变量。
        ServletOutputSteam ostrem = response.getOutputStream();
        int by = inStream.read();
        while(by != -1)
        {
          ostrem.write(by);
          by = inStream.read();
        }
        ostrem.flush();
        inStream.close();//关闭流
        ostrem.close();
      }