I for myself do such things when preparing the log message, i.e.:
if (myLog.isDebugEnabled())
{
myLog.debug( received binary data:\n + Conversions.byteArrayToHexDump(
myByteArray ) );
}
Annother apporach is to write your own renderer. In this case you would have
also to define an own class which transports the message and binary data
through the log4j layers until it reaches your renderer.
Configuration:
renderer renderedClass=my.company.com.BinaryWrapper
renderingClass=my.company.com.BinaryRenderer/
Code:
if (myLog.isDebugEnabled())
{
BinaryWrapper wrap = new BinaryWrapper( received binary data, myByteArray
);
myLog.debug( wrap );
}
When log4j is about to convert the supplied Object to String, it will call your
BinaryRenderer supplying your BinaryWrapper instance. Remember: the formal
parameter of Logger.debug etc. is an Object and not a String. If no renderer
for a particular class is configured, log4j just calls toString() of the
supplied Object otherwise it calls the configured renderer.
Heri
-Original Message-
From: news [mailto:[EMAIL PROTECTED] Behalf Of teknokrat
Sent: Monday, March 17, 2008 2:06 PM
To: log4j-user@logging.apache.org
Subject: [SPAM (Bayesain Analysis)] - How to log binary data
- Bayesian
Filter detected spam
I have a requirement to log raw binary data. This will be
mostly ASCII
characters but will contain non-displayable control
characters such as
\0, etc. My first thought was to write an appender by extending the
FileAppender class but I cannot see how to do this as I need
access to
an OutputStream and not a Writer. Does anyone have any good
ideas of how
this can be done witht he minimum of fuss in log4j?
cheers
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