FtpClient storeFile 总是返回 False

请弄清楚这一点。代码正常运行，没有任何异常。

try
{
    FTPClient ftp = new FTPClient();
    ftp.connect(server);
    if(!ftp.login(username, password))
    {
        ftp.logout();
        return false;
    }
    int reply = ftp.getReplyCode();
    if (!FTPReply.isPositiveCompletion(reply))
    {
        ftp.disconnect();
        return false;
    }
    InputStream in = new FileInputStream(localfile);
    ftp.setFileType(ftp.BINARY_FILE_TYPE, ftp.BINARY_FILE_TYPE);
    ftp.setFileTransferMode(ftp.BINARY_FILE_TYPE);
    Store = ftp.storeFile(destinationfile, in);
    in.close();
    ftp.logout();
    ftp.disconnect();
}
catch (Exception ex)
{
    ex.printStackTrace();
    return false;
}
return Store;

但是，return 语句始终返回 false，并且文件不会上载到服务器上。有人请帮忙。

供您参考，我在办公室网络。我们需要--->添加任何代理？

File file = new File("C:\\Users\\sg0214273\\Desktop\\seagate\\seagate.txt");
FileInputStream input = new FileInputStream(file);
client.setFileType(FTP.BINARY_FILE_TYPE);
if (!client.storeFile(file.getName(), input)) {
  System.out.println("upload failed!");
} 
reply = client.getReplyCode();

if(!FTPReply.isPositiveCompletion(reply)) {
  System.out.println("upload failed!");
}

Login success...
230 User ******** logged in.
upload failed!-----> is form boolean return value of storefile 
upload failed!---------> is from replycode...
Logout from FTP server...

请帮忙。