在Android上FTP上传和下载

        con.connect("ftp.194.90.81.149"); //here i recieve exception //the exception is java.unknownhostexception //java.net.UnknownHostException: Unable to resolve host

“ftp.194.90.81.149”: No address associated with hostname

您收到UnknownHostException的事实意味着ftp.194.90.81.149在DNS中不是真实的主机名。我怀疑其中的数字部分是您真正想要的。即，尝试将该行更改为

con.connect("194.90.81.149");