java - How can I code a web app p2p network? -

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i wanted code web application, 1 user can choose file , other multiple users can download specified file off of that user's computer. that user have leave computer on , leave web page open.

i dont want have big main server has handle traffic. that user's computer server, persay. understand i'll use torrent.

all has done on website.

will web socket work?

please , thanks.

this isn't possible variety of reasons:

  • firewalls / nats
  • dynamic ips
  • no "server" running on user's machines
  • permissions on user's machine
  • what happens if user deletes file on machine?

to make work you'd have to:

  • convince user install app on machine (you'd need windows/linux/... exe)
  • get user open port in firewall (or use library enable nat passthru)
  • have user's pc ping server in event user's ip changes

on server side, you'd have keep several database tables, here few can think of off top of head:

  • a user's table (user id [pk], current ip, communications port, (maybe other tracking things))
  • available downloads table (download id [pk], user id [fk])

then when wants go off , download, have (probably) launch app requisite arguments (remote user's ip/port/file id) , have work of download.

this no means easy feat.


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