无法在java中连接FTP服务器

我正在尝试使用Apache Commons Net在java中开发FTP客户端，但即使我的代码看起来不错，我也无法连接到任何服务器，因此我得到：

java.net.ConnectException: connect: Address is invalid on local machine, or port is not valid on remote machine
    at java.net.DualStackPlainSocketImpl.connect0(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 java.net.Socket.connect(Unknown Source)
    at java.net.Socket.<init>(Unknown Source)
    at java.net.Socket.<init>(Unknown Source)
    at org.apache.commons.net.ftp.FTPHTTPClient.connect(FTPHTTPClient.java:131)
    at org.apache.commons.net.SocketClient.connect(SocketClient.java:296)
    at awax.meteosat.test.FTPClientTest.connect(FTPClientTest.java:52)
    at awax.meteosat.test.FTPClientTest.main(FTPClientTest.java:146)
client disconnected
Exception in thread "main" java.lang.IllegalStateException: Client disconnected
    at awax.meteosat.test.FTPClientTest.login(FTPClientTest.java:100)
    at awax.meteosat.test.FTPClientTest.main(FTPClientTest.java:147)

尝试使用而不是FTPHTTPClient（根据它的实验，这是FTP连接的HTTP代理）

应该很好

哎哟，你说得对；）我只是在apache网站上阅读了FTPClientExample.java文件，它没有提到它是实验性的。非常感谢。

public void connect () {
    if (this.client == null) {
        this.client = new FTPClient();