问题
So I wanted to work on a new Java project that converts magnet URIs into .torrent files, however I can't find a way to do that, basically I broke a magnet URI into pieces :
The used URI :
magnet:?xt=urn:btih:d2474e86c95b19b8bcfdb92bc12c9d44667cfa36&dn=Leaves+of+Grass+by+Walt+Whitman.epub&tr=udp%3A%2F%2Ftracker.example4.com%3A80&tr=udp%3A%2F%2Ftracker.example5.com%3A80&tr=udp%3A%2F%2Ftracker.example3.com%3A6969&tr=udp%3A%2F%2Ftracker.example2.com%3A80&tr=udp%3A%2F%2Ftracker.example1.com%3A1337
The breaking down :
magnet:?
xt=urn:btih:d2474e86c95b19b8bcfdb92bc12c9d44667cfa36
dn=Leaves+of+Grass+by+Walt+Whitman.epub
tr=udp%3A%2F%2Ftracker.example4.com%3A80
tr=udp%3A%2F%2Ftracker.example5.com%3A80
tr=udp%3A%2F%2Ftracker.example3.com%3A6969
tr=udp%3A%2F%2Ftracker.example2.com%3A80
tr=udp%3A%2F%2Ftracker.example1.com%3A1337
from what I gathered using this link, The torrent file contains the files , lengths and paths of the required files but I can't seem to get that from the magnet URI.
Thanks in advance.
回答1:
It's impossible to recreate the .torrent file from the magnet link alone.
The way torrent clients gets the .torrent file from a magnet link is:
- Get a peer list from the tracker(s) and/or from the DHT.
- Connect to peers and download the .torrent metadata using
BEP9 - Extension for Peers to Send Metadata Files.
回答2:
not really clean but..
Runtime.getRuntime().exec(new String[]{"cmd", "/c","start firefox " + mag});
// needs firefox and a default torrent handler. // mag = magnet string
来源：https://stackoverflow.com/questions/48873300/how-to-create-torrent-file-from-magnet-link-using-java