log4配置

log4j 和 log4j2

方式一：log4j2.xml

添加 jar 包

1     <!-- log4j-core -->
2     <!--
3     <dependency>
4         <groupId>org.apache.logging.log4j</groupId>
5         <artifactId>log4j-core</artifactId>
6         <version>2.6.2</version>
7     </dependency>

文件配置：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <Configuration>
 3     <Appenders>
 4         <Console name="STDOUT" target="SYSTEM_OUT">
 5             <PatternLayout pattern="%d %-5p [%t] %C{2} (%F:%L) - %m%n"/>
 6         </Console>
 7     </Appenders>
 8     <Loggers>
 9         <Logger name="com.opensymphony.xwork2" level="debug"/>
10         <Logger name="org.apache.struts2" level="debug"/>
11         <Root level="warn">
12             <AppenderRef ref="STDOUT"/>
13         </Root>
14     </Loggers>
15 </Configuration>

方式二：log4j.properties

添加 jar 包

1     <!-- log4j -->
2     <dependency>
3         <groupId>log4j</groupId>
4         <artifactId>log4j</artifactId>
5         <version>1.2.17</version>
6     </dependency>

文件配置:

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c:/mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change ‘info‘ to ‘debug‘ ###

log4j.rootLogger=info, stdout