struts输出图片列表

从数据库中取出图片字节流，并在界面输出图片

public ActionForward photoList(final ActionMapping mapping, final ActionForm form, final HttpServletRequest request, final HttpServletResponse response)
{
       
        long blobId = Long.parseLong(request.getParameter("blobId"));
    ServletOutputStream outs = null;
    BufferedOutputStream bos = null;
try {
  outs = response.getOutputStream();
  BlobService blobService = (BlobService)getBean("BlobService");
  BlobVO b=blobService.getBlobByOid(blobId);
  int blobsize = (int)b.getContent().length;
  response.setContentType("image/jpeg;charset=GB2312");
  response.setHeader("Content-Transfer-Encoding","base64"); 
  bos = new BufferedOutputStream(outs);
  bos.write(b.getContent(),0,blobsize);
  bos.flush(); 
 
} catch (IOException e) {
e.printStackTrace();
}
finally{
try {
if(bos!=null)
bos.close();
if(outs!=null)
outs.close();
} catch (IOException e) {
e.printStackTrace();
}
}


  return mapping.findForward("photo");
     }