FTP Client 如何删除服务器上的文件? 文件名是知道的
------解决方案--------------------
FtpClient client = new FtpClient(ftp_ip, Integer.parseInt(ftp_port));
client.login(ftp_user, ftp_pwd);
client.binary();
client.cd(this.ftp_rdir);
String cmd = "DELE " + filename + "\r\n ";
client.sendServer(cmd);