for youku.com you can DL and setup youku pc-client to DL the files
link is :
http://desktop.youku.com/youkuclient/youkuclient_setup.exe
pls note that in youku.com some of file can't DL or play in some region due to the copyright
also J-downloader also can DL youku files
for 115,you need to regist first(its free)then you can DL the file to your computer or save to your account in 115
since I haven't use 115 to DL file for a long time
pls give me a sample link and I will try to explain how to DL the file to you
Thanks.
ex.
http://www.xingxingbang.com/html/kbxiazai/201201/17-4891.html
http://www.xingxingbang.com/html/kbxiazai/201202/21-5181.html
http://www.xingxingbang.com/html/kbxiazai/201203/06-5293.html
http://www.xingxingbang.com/html/kbxiazai/201203/05-5286.html
http://www.xingxingbang.com/html/kbxiazai/201203/20-5457.html
http://www.xingxingbang.com/html/kbxiazai/201207/30-7265.html
Thank you for your consideration.