jsf - File type management in java with an JPA binding -

i have file linked object byte[]. file stored in db in blob column type , binding made @lob annotation.

the problem system doesn't manage file type (ie : upload pdf when download it, doesn't have type)

can give me easy way deal type of issue ?

my first thought store type in simple varchar column how change type of stream on byte[] getter ?

imho you'r right using separate field mimetype lob content. can during upload deduce mimetype store jpa entity.

in download servlet, can write :

string mimetype = entity.getmimetype();  // sets response content type if (mimetype == null) {     mimetype = "application/octet-stream"; } response.setcontenttype(mimetype); response.setcontentlength((int)file.length()); string filename = (new file(filepath)).getname();  // sets http header response.setheader("content-disposition", "attachment; filename=\"" + filename + "\"");