将ftpClient.connect
与没有活动ftp服务的现有主机一起使用时,超时仅在5分钟后发生,这太长了。
我尝试设置不同的超时(setDefaultTimeout,setDataTimeout),但没有改变任何内容。
FtpClient
继承自SocketClient
,它有一个setConnectTiemout方法,但是当我使用它时,我在运行时得到java.lang.NoSuchMethodError: org/apache/commons/net/ftp/FTPClient.setConnectTimeout
。这似乎是因为一些J2SW 1.2兼容性,如Commons-net FAQ中所述:
问:如何设置连接超时? http://wiki.apache.org/commons/Net/FrequentlyAskedQuestions
他们建议使用特定的超时从扩展的Socket类中实现自己的SocketFactory
创建对象。但是,在尝试使用ftpClient.setSocketFactory
时,我也会获得java.lang.NoSuchMethodError
。
如何减少连接超时的任何帮助?
答案 0 :(得分:3)
虽然可能有旧版Commons Net库的解决方案,但我建议弄清楚为什么使用错误版本的Commons Net。为此,您可以将以下代码包含在您的webapp中使用FTPClient
的位置:
FTPClient ftpClient = ...;
if(ftpClient.getClass().getClassLoader() instanceof java.net.URLClassLoader) {
URL[] urls = ((java.net.URLClassLoader) ftpClient.getClass().getClassLoader()).getURLs();
// log these urls somewhere and check - these are urls from where your FTPClient may be loaded from
}
如果FTPClient
加载的java.net.URLClassLoader
不是{{1}},那么检查类路径会变得更复杂,尽管这不应该是一个问题。
希望这会有所帮助......
答案 1 :(得分:2)
它必须与调用setConnectTimeout的方式相同,因为它确实存在。 setConnectTimeout不是静态调用,必须在分配FTPClient对象并在连接之前执行set之后调用它。
FTPClient ftp = new FTPClient();
ftp.setConnectTimeout(5000); // 5000 Milliseconds (5 Seconds)
...
ftp.connect(server, port);
答案 2 :(得分:2)
FTPClient ftp = new FTPClient();
ftp.setDefaultTimeout();
ftp.setDataTimeout();
ftp.setConnectTimeout();
ftp.setSoTimeout();
ftp.setControlKeepAliveTimeout();
ftp.setControlKeepAliveReplyTimeout();
来自Apache docs:
/**
* Set the default timeout in milliseconds to use when opening a socket.
* This value is only used previous to a call to
* {@link #connect connect()}
* and should not be confused with {@link #setSoTimeout setSoTimeout()}
* which operates on an the currently opened socket. _timeout_ contains
* the new timeout value.
* <p>
* @param timeout The timeout in milliseconds to use for the socket
* connection.
*/
void setDefaultTimeout(int timeout);
/**
* Sets the timeout in milliseconds to use when reading from the
* data connection. This timeout will be set immediately after
* opening the data connection, provided that the value is ≥ 0.
* <p>
* <b>Note:</b> the timeout will also be applied when calling accept()
* whilst establishing an active local data connection.
* @param timeout The default timeout in milliseconds that is used when
* opening a data connection socket. The value 0 means an infinite timeout.
*/
void setDataTimeout(int timeout)
/**
* Sets the connection timeout in milliseconds, which will be passed to the {@link java.net.Socket} object's
* connect() method.
* @param connectTimeout The connection timeout to use (in ms)
* @since 2.0
*/
void setConnectTimeout(int connectTimeout);
/**
* Set the timeout in milliseconds of a currently open connection.
* Only call this method after a connection has been opened
* by {@link #connect connect()}.
* <p>
* To set the initial timeout, use {@link #setDefaultTimeout(int)} instead.
*
* @param timeout The timeout in milliseconds to use for the currently
* open socket connection.
* @exception SocketException If the operation fails.
* @throws NullPointerException if the socket is not currently open
*/
void setSoTimeout(int timeout) throws SocketException;
/**
* Set the time to wait between sending control connection keepalive messages
* when processing file upload or download.
*
* @param controlIdle the wait (in secs) between keepalive messages. Zero (or less) disables.
* @since 3.0
* @see #setControlKeepAliveReplyTimeout(int)
*/
void setControlKeepAliveTimeout(long controlIdle);
/**
* Set how long to wait for control keep-alive message replies.
*
* @param timeout number of milliseconds to wait (defaults to 1000)
* @since 3.0
* @see #setControlKeepAliveTimeout(long)
*/
void setControlKeepAliveReplyTimeout(int timeout)
答案 3 :(得分:0)
只是为这些值添加一些说明(在手动测试了很多组合之后,并且只是提到这与在 apache Function LastPredecessorV2(PreList As String, EndDates As Range, IDColumn As Range) As Date
Dim Preds() As String, PredDates() As Long
Preds = Split(Replace(PreList, " ", ""), ",")
ReDim PredDates(UBound(Preds))
For i = LBound(Preds) To UBound(Preds)
PredDates(i) = IDColumn.Find( _
What:=CInt(Preds(i)), _
LookAt:=xlWhole _
).Offset(0, EndDates.Column - IDColumn.Column).Value2 'Corrected
Next i
LastPredecessorV2 = CDate(Application.WorksheetFunction.Max(PredDates))
End Function
下使用的 spring DefaultFtpSessionFactory
有关 - 所以最后适用于那个):
FTPClient