PictureReadByIbatis  pri = new PictureReadByIbatis();
            CeShi text = new CeShi();
            Map demoMap = new HashMap();
            List demoList = new ArrayList();
            demoList = pri.getList("showTable", demoMap);
            text = (CeShi)demoList.get(0);
            //把读出的数据流文件存进一个byte数组中*
            //byte[]dd = text.getCeshi();
            byte[]dd2 = text.getCeshi();
            
            
             ServletOutputStream out = null;
             response.setContentType("image/bmp");
                     out = response.getOutputStream();  
                     out.write(dd2);  
                     out.flush(); 
                     out.close();
                     return null;