FtpClient请求ftp服务器报Connection refused: connect-Toy模板网

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1、背景

使用ftpclient 从ftp服务器上下载文件到指定文件夹

ftp服务器搭建好之后，使用FileZilla软件连接正常，下载也正常，如下图：

FtpClient请求ftp服务器报Connection refused: connect,服务器,运维,http

然而，使用java代码使用FtpClient登陆服务器正常，在进行下载的时候报错如下

java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
	at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
	at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
	at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
	at java.net.PlainSocketImpl.connect(Unknown Source)
	at java.net.SocksSocketImpl.connect(Unknown Source)
	at java.net.Socket.connect(Unknown Source)
	at org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:920)
	at org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:785)
	at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3409)
	at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3339)
	at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:3016)
	at com.iflytek.ahslyy.ftpconverter.utils.FtpUtil.download(FtpUtil.java:143)
	at com.iflytek.ahslyy.ftpconverter.service.FtpService.download(FtpService.java:62)
	at com.iflytek.ahslyy.ftpconverter.service.HldConverterService.hldConverter(HldConverterService.java:102)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
	at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
	at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81)
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

在测试环境测试的好好的，没想到上线遇到这种问题，害，命途多舛啊。

找了很久的原因终于在这篇文章中找到了答案
https://www.656463.com/wenda/sjljsdFTPSClienttjzcs_354

如文章中所说