log4j log File configuration

log4j log File configuration

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first, the log device configuration

# root Logger (other logs are inherited from this logger)

# Default Level=debug
Log4j.rootlogger=info, A1, A2 (a1,a2 for Appender)

# Level of the log

Log4j.logger.a=info,a1

Log4j.logger.a.b=debug,a1,a2

The log's inheritance relationship is: A.b inherits from the A,a inherits from the root logger, namely sends to the A.B the info log, also will be A record, also can by the root logger record

Note: A.B is not necessarily a package name plus class name, you can name any

Code:

Logger Logger = Logger.getlogger ("a.b");

logger.debug ("Test Log");

Then the A.B log inherits the Appender of a and root logger, so "test log" outputs three times, where the level info of the A log does not affect and still outputs "test log"

log4j Configuration for HttpClient
# commons.httpclient
Log4j.logger.httpclient.wire.header=info
Log4j.logger.httpclient.wire=info
Log4j.logger.org.apache.commons.httpclient=info

Second, appender configuration
# Console Appender=a1,file appender=a2,db appender=a3,mail appender=a4

# A1
Log4j.appender.a1=org.apache.log4j.consoleappender
Log4j.appender.a1.threshold=debug
Log4j.appender.a1.layout=org.apache.log4j.patternlayout
log4j.appender.a1.layout.conversionpattern=%-5p logger:%c{1} date:%d{iso8601}-%m%n

# A2
Log4j.appender.a2=org.apache.log4j.rollingfileappender
Log4j.appender.a2.threshold=debug

# ${loghome} and ${logname} read from the system environment variable [System.setproperty (prop,value)]
Log4j.appender.a2.file=${loghome}/${logname}
Log4j.appender.a2.append=true
Log4j.appender.a2.layout=org.apache.log4j.patternlayout
log4j.appender.a2.layout.conversionpattern=%-5p logger:%c{1} date:%d{iso8601}-%m%n
log4j.appender.a2.maxbackupindex=10
Log4j.appender.a2.maxfilesize=2mb

# A3
Log4j.appender.a3=org.apache.log4j.jdbc.jdbcappender
Log4j.appender.a3.threshold=warn
Log4j.appender.a3.url=jdbc:mysql://localhost:3306/test
Log4j.appender.a3.driver=com.mysql.jdbc.driver
Log4j.appender.a3.user=root
log4j.appender.a3.password=
Log4j.appender.a3.sql=insert into log4j (message) VALUES ('%-5p logger:%c{1} date:%d{iso8601}-%m%n ')
Log4j.appender.a3.layout=org.apache.log4j.patternlayout
log4j.appender.a3.layout.conversionpattern=%-5p logger:%c{1} date:%d{iso8601}-%m%n

# A4
Log4j.appender.a4=org.apache.log4j.net.smtpappender
Log4j.appender.a4.threshold=error
log4j.appender.a4.buffersize=10
Log4j.appender.a4.smtpusername=qydd_program
log4j.appender.a4.smtppassword=
log4j.appender.a4.smtphost=smtp.mail.yahoo.com.cn
Log4j.appender.a4.smtpdebug=true
log4j.appender.a4.from=qydd_program@yahoo.com.cn
Log4j.appender.a4.subject=baseframe Error Message
log4j.appender.a4.to=qydd_program@yahoo.com.cn
Log4j.appender.a4.layout=org.apache.log4j.patternlayout
log4j.appender.a4.layout.conversionpattern=%-5p logger:%c{1} date:%d{iso8601}-%m%n

Third, code example

Log4j.properties---------------------------------------# Logger Log4j.rootlogger=warn, A1 Log4j.logger.a=warn, A1 Log4j.logger.a.b=info, A1 # A1 Appender log4j.appender.a1=org.apache.log4j.consoleappender Log4j.appender.a1.threshold=debug Log4j.appender.a1.layout=org.apache.log4j.patternlayout log4j.appender.a1.layout.conversionpattern=%-5p logger:%c{1} date:%d{iso8601}-%m%n TestLog4J.java---------------- ------------------------Package Test; Import java.io.IOException; Import Java.io.InputStream; Import java.util.Properties; Import Org.apache.log4j.Logger; public class Testlog4j {public static void main (string[] args) throws IOException {InputStream in = TestLog4J.class.getR Esourceasstream ("Log4j.properties"); Properties Props = new properties (); Props.load (in); Org.apache.log4j.PropertyConfigurator.configure (props); Logger Rootlogger = Logger.getrootlogger (); Rootlogger.debug ("Test1"); Logger Alogger = Logger.getlogger ("A"); Alogger.warn ("Test2"); Logger Ablogger = Logger.getlOgger ("a.b"); Ablogger.info ("Test3"); Ablogger.debug ("Test4"); } }

Output:

WARN logger:a date:2009-10-02 01:13:52,734-test2
WARN logger:a date:2009-10-02 01:13:52,734-test2
INFO logger:b date:2009-10-02 01:13:52,734-test3
INFO logger:b date:2009-10-02 01:13:52,734-test3
INFO logger:b date:2009-10-02 01:13:52,734-test3

Analysis:

(1) Because the root logger is warn, its output is debug, so "Test1" does not print

(2) A logger inherits from Root logger, its level is warn, output is warn, so output two "Test2"

(3) B Logger inherits from a Logger,a Logger inherits from the root Logger, its level is info, so output three "Test3", and "Test4" does not output

(4) B logger prints the info ("Test3") satisfies the a.b level, but does not meet the level warn of a and root logger, but log4j appends the logger of a and root appender only to a.b, so levels to B The logger print does not affect

(5) Adding a log4j.additivity.a.b=false line in the log4j.properties so that the output of the A.B logger is output only in itself, not in a and root logger output