打算使用ftp4j做文件的上传和下载，不过初始报出一个错误
failed to connect to /127.0.0.1 (port 3883) after 90000ms: isConnected failed: ECONNREFUSED (Connect。。。。failed to co
阅读背景：
Ftp4j 报错failed to connect to /127.0.0.1 (port 3883) after 90000ms: isConnected failed: ECONNREFUSED
来源：互联网
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