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111.12. 逐步更改目录

在消耗文件（例如下载）或生成文件（例如上传）时，Camel FTP 可在遍历目录方面以两种模式运行。

  • stepwise
  • 不分步

您可能希望根据您的情况和安全问题选择其中之一。有些 Camel 最终用户只能在文件使用步骤时下载文件，而其他用户只能下载文件（如果文件则不能进行下载）。您至少可以选择选择（从 Camel 2.6 开始）。

在 Camel 2.0 - 2.5 中，只有一个模式，它：

  • 2.5 之前没有步骤
  • 2.5 stepwise

现在，从 Camel 2.6 开始，您可以使用一个选项来控制行为。

请注意，在大多数情况下，目录更改操作才会在大多数情况下才能工作，而当主目录报告为 "/" 时，才起作用。

其中两个之间的差别最好地展示了一个示例。假设我们在远程 FTP 服务器上有以下目录结构，我们需要遍历和下载文件： 

/
/one
/one/two
/one/two/sub-a
/one/two/sub-b
Copy to Clipboard Toggle word wrap

我们在每个子(a.txt)和子b (b.txt)文件夹中都有一个文件。

111.12.1. 使用 stepwise=true （默认模式）
复制链接

TYPE A
200 Type set to A
PWD
257 "/" is current directory.
CWD one
250 CWD successful. "/one" is current directory.
CWD two
250 CWD successful. "/one/two" is current directory.
SYST
215 UNIX emulated by FileZilla
PORT 127,0,0,1,17,94
200 Port command successful
LIST
150 Opening data channel for directory list.
226 Transfer OK
CWD sub-a
250 CWD successful. "/one/two/sub-a" is current directory.
PORT 127,0,0,1,17,95
200 Port command successful
LIST
150 Opening data channel for directory list.
226 Transfer OK
CDUP
200 CDUP successful. "/one/two" is current directory.
CWD sub-b
250 CWD successful. "/one/two/sub-b" is current directory.
PORT 127,0,0,1,17,96
200 Port command successful
LIST
150 Opening data channel for directory list.
226 Transfer OK
CDUP
200 CDUP successful. "/one/two" is current directory.
CWD /
250 CWD successful. "/" is current directory.
PWD
257 "/" is current directory.
CWD one
250 CWD successful. "/one" is current directory.
CWD two
250 CWD successful. "/one/two" is current directory.
PORT 127,0,0,1,17,97
200 Port command successful
RETR foo.txt
150 Opening data channel for file transfer.
226 Transfer OK
CWD /
250 CWD successful. "/" is current directory.
PWD
257 "/" is current directory.
CWD one
250 CWD successful. "/one" is current directory.
CWD two
250 CWD successful. "/one/two" is current directory.
CWD sub-a
250 CWD successful. "/one/two/sub-a" is current directory.
PORT 127,0,0,1,17,98
200 Port command successful
RETR a.txt
150 Opening data channel for file transfer.
226 Transfer OK
CWD /
250 CWD successful. "/" is current directory.
PWD
257 "/" is current directory.
CWD one
250 CWD successful. "/one" is current directory.
CWD two
250 CWD successful. "/one/two" is current directory.
CWD sub-b
250 CWD successful. "/one/two/sub-b" is current directory.
PORT 127,0,0,1,17,99
200 Port command successful
RETR b.txt
150 Opening data channel for file transfer.
226 Transfer OK
CWD /
250 CWD successful. "/" is current directory.
QUIT
221 Goodbye
disconnected.
Copy to Clipboard Toggle word wrap

正如您在启用 stepwise 时看到，它将使用 CD xxx 遍历目录结构。

111.12.2. 使用 stepwise=false
复制链接

230 Logged on
TYPE A
200 Type set to A
SYST
215 UNIX emulated by FileZilla
PORT 127,0,0,1,4,122
200 Port command successful
LIST one/two
150 Opening data channel for directory list
226 Transfer OK
PORT 127,0,0,1,4,123
200 Port command successful
LIST one/two/sub-a
150 Opening data channel for directory list
226 Transfer OK
PORT 127,0,0,1,4,124
200 Port command successful
LIST one/two/sub-b
150 Opening data channel for directory list
226 Transfer OK
PORT 127,0,0,1,4,125
200 Port command successful
RETR one/two/foo.txt
150 Opening data channel for file transfer.
226 Transfer OK
PORT 127,0,0,1,4,126
200 Port command successful
RETR one/two/sub-a/a.txt
150 Opening data channel for file transfer.
226 Transfer OK
PORT 127,0,0,1,4,127
200 Port command successful
RETR one/two/sub-b/b.txt
150 Opening data channel for file transfer.
226 Transfer OK
QUIT
221 Goodbye
disconnected.
Copy to Clipboard Toggle word wrap

正如您在不使用 stepwise 时所见，根本没有调用 CD 操作。

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