mongodb中获取图片文件<标记>
标签：图片 pre tac style 取图 string mon download class
mongodb中获取图片文件<标记>
public void downLoadFileFormMongo(HttpServletRequest request,HttpServletResponse response ) throws Exception {
String filename=request.getParameter("fileId");
GridFSDBFile file = fileService.retrieveFileOne("fs", filename);
InputStream in = file.getInputStream();
filename=(String) file.get("aliases");
filename=filename.replace(" ", "");
String fileName = new String(filename.getBytes("GB2312"), "ISO_8859_1");
filename = fileName;
//response.setCharacterEncoding("UTF-8");
response.setContentType(file.getContentType());
response.setHeader("Content-Disposition", "attachment;filename=" + filename);
OutputStream out = response.getOutputStream();
byte[] buffer = new byte[2048];
int i = -1;
while ((i = in.read(buffer)) != -1) {
out.write(buffer, 0, i);
}
in.close();
out.flush();
out.close();
}