import sun.net.ftp.FtpClient;时有错误,显示:Access restriction: The type 'FtpClient' is not API (restriction on required library 'C:\Program Files(x86)\Java\jre7\lib\rt.jar')这个要去哪里下载啊?下载之后怎么装啊?谢谢了!btw,新年快乐!!
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