如何通过Java中的TLS / SSL(FTPS)服务器连接到FTP [英] How to connect to FTP over TLS/SSL (FTPS) server in Java
问题描述
我在通过TLS / SSL连接到FTP时遇到困难( FTPS)服务器。我通过能够连接FTP服务器而不使用SSL但无法连接FTPS来使用SimpleFTP库。
它在第2行(ftp.connect)给了我这个错误,
当连接到FTP服务器时,SimpleFTP收到未知响应:
220 -------- - 欢迎使用Pure-FTPd [privsep] [TLS] ----------
并且正在使用以下版本代码
SimpleFTP ftp = new SimpleFTP();
//连接到端口21上的FTP服务器。
ftp.connect(xxx.xxx.xxx.xxx,21,username,pwd);
//在(ftp.connect)行上面获得错误
//设置二进制模式。
ftp.bin();
//转到FTP服务器上的新工作目录。
ftp.cwd(web);
ftp.disconnect();
SimpleFTP
使用 FTPSClient
Apache Commons Net库中的
请参阅 FTPClient
class的官方示例,只需将 FTPClient
替换为 FTPSClient
。
FTPSClient ftpClient = new FTPSClient();
ftpClient.connect(host);
ftpClient.login(user,password);
FTPSClient
class默认为显式TLS / SSL(推荐)。在极少数情况下,您需要隐式TLS / SSL,请使用
new FTPSClient(true)
。
I searched SO, googled more than 2 days and did not found any answer that helps me.
I'm stuck in connecting to FTP over TLS/SSL (FTPS) server. I am using SimpleFTP library through am able to connect FTP server without SSL but could not connect FTPS.
It is giving me this error at line 2 (ftp.connect),
SimpleFTP received an unknown response when connecting to the FTP server:
220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
and am using below code
SimpleFTP ftp = new SimpleFTP();
// Connect to an FTP server on port 21.
ftp.connect("xxx.xxx.xxx.xxx", 21, "username", "pwd");
//getting error at (ftp.connect) above line
// Set binary mode.
ftp.bin();
// Change to a new working directory on the FTP server.
ftp.cwd("web");
ftp.disconnect();
The SimpleFTP
class/library does not support TLS/SSL at all.
Use the FTPSClient
class from the Apache Commons Net library instead.
See the official example for the FTPClient
class and just substitute the FTPClient
with the FTPSClient
.
FTPSClient ftpClient = new FTPSClient();
ftpClient.connect(host);
ftpClient.login(user, password);
The FTPSClient
class defaults to an explicit TLS/SSL (recommended). In a rare case you need an implicit TLS/SSL, use new FTPSClient(true)
.
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