how to write different information to two different files using same logger of log4j?

问题

I'd like to write to two different files using my logger, which is declared like this:

public static final Logger logger = Logger.getLogger(Adapt.class);
PropertyConfigurator.configure("log4j.properties");

the file log4j contains:

log4j.rootLogger=DEBUG, FA

#File Appender
log4j.appender.FA=org.apache.log4j.FileAppender
log4j.appender.FA.File=temp.ppr
log4j.appender.FA.layout=org.apache.log4j.PatternLayout
log4j.appender.FA.append=false
log4j.appender.FA.layout.ConversionPattern= %m%n

Is it possible at all to use logger to write different text to two different files easily?

If not, is there a way to do that with two loggers? (I tried that and got problems because of the function configure which is static.)

Thanks.

回答1:

Just define a second logger variable:

Logger otherLogger = Logger.getLogger("OTHER_LOGGER");

define a configuration for it (notice the log4j.logger.OTHER_LOGGER syntax cf. log4j.rootLogger, as pointed out by user623395 and venkatesh Dodla):

log4j.logger.OTHER_LOGGER=DEBUG, OtherAppender

log4j.additivity.OTHER_LOGGER = false

#File Appender
log4j.appender.OtherAppender=org.apache.log4j.FileAppender
log4j.appender.OtherAppender.File=temp2.ppr
log4j.appender.OtherAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.OtherAppender.append=false
log4j.appender.OtherAppender.layout.ConversionPattern= %m%n

and log your different text as usual:

logger.debug("My normal log");
otherLogger.info("My special text");

回答2:

it worked for me. My Log file:

# log4j.properties
log4j.rootLogger=DEBUG,hfis,stdout
#For second log
log4j.logger.OTHER_LOGGER=DEBUG, OtherAppender
log4j.additivity.OTHER_LOGGER = false 

#File Appender 
log4j.appender.OtherAppender=org.apache.log4j.FileAppender 
log4j.appender.OtherAppender.File=C:\\Legacy.log
log4j.appender.OtherAppender.ImmediateFlush=true 
log4j.appender.OtherAppender.layout=org.apache.log4j.PatternLayout 
log4j.appender.OtherAppender.layout.ConversionPattern=%d{dd MMM yyyy HH:mm:ss.SSS} [%t] %-5p %c - %m%n 

log4j.rootCategory=ERROR
log4j.rootLogger.additivity=false

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.hfis=org.apache.log4j.RollingFileAppender
log4j.appender.hfis.Threshold=DEBUG
log4j.appender.hfis.file=C:\\hfis.log 
log4j.appender.hfis.ImmediateFlush=true
log4j.appender.hfis.MaxFileSize=5MB
log4j.appender.hfis.layout=org.apache.log4j.PatternLayout
log4j.appender.hfis.layout.ConversionPattern=%d{dd MMM yyyy HH:mm:ss.SSS} [%t] %-5p %c - %m%n
# R is the RollingFileAppender that outputs to a rolling log
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Threshold=DEBUG

# Define a pattern layout for the file.
log4j.appender.mystdout.layout=org.apache.log4j.PatternLayout
log4j.appender.mystdout.layout.ConversionPattern=%d{dd MMM yyyy HH:mm:ss.SSS} %-5p: %m%n<br>

and my log variables are

final static Logger log = Logger.getLogger("hfis");
final static Logger log2 = Logger.getLogger("OTHER_LOGGER");

回答3:

To create temp2.ppr, change from

log4j.OTHER_LOGGER=DEBUG, OtherAppender

log4j.**logger**.OTHER_LOGGER=DEBUG, OtherAppender

来源：https://stackoverflow.com/questions/4707847/how-to-write-different-information-to-two-different-files-using-same-logger-of-l

标签

java

logging

file

log4j