JSP文件上传。从FTP转换为SFTP

I have a JSP page which contains a link to upload a file. Initially the file transfer was happening using FTP. The server seems to transfer the file from client using the FTP only. I require to change the code to support SFTP now. Like the server initiated an FTP session on the client machine, is it possible for SFTP as well? here is the client code: I have a JSP page which contains a link to uplo