Asking expert knowledge related to File Insert or Embedded into HTML File Php Java

I`m currently working on a project. it is a desktop application using java swing.There i have a option to send email with a email with a HTML link. in that link i have to embedded PDF file which is located in a desktop folder. this folder is static one.

few things need to be considered.

1. PDF files cant put into a database(Major Requirement).
2. There are 100+ pdf in a folder. these PDF files must go to a 100+ users one person only one file in an email.

Please give me a suggestion.