图像下载成功，但我打开图像显示“无法打开此文件。文件可能已损坏。”

Question

//this section is download  user image data from the db
@RequestMapping(value={"/downloadRow-{img_id}"} , method=RequestMethod.GET)
public void downloadImageFile(@PathVariable int img_id,HttpServletResponse response ,HttpServletRequest request,ModelMap model) 
throws IOException, ServletRequestBindingException{

    ImageModel imgModel=service.downloadFile(img_id);   
    response.setContentType(imgModel.getImageContentTyepe());
    response.setContentLength(imgModel.getImageContentTyepe().length());
    response.setHeader("Content-Disposition","attachment; filename=\""+imgModel.getImg_name()+"\" ");
    FileCopyUtils.copy(imgModel.getImageConent(), response.getOutputStream());              //qustn
    response.getOutputStream().close();
    showRecord(model) ;

}

Answer 1

我认为你错过了一个

response.flushbuffer 

复制流之后。这对我有用：

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM.toString());
            response.addHeader("Content-Disposition", "attachment; filename=" + file.getFileName());
            IOUtils.copy(fsin, response.getOutputStream());
            fsin.close();
            response.flushBuffer();
            response.getOutputStream().close()