我想要一个非常简单的XML配置文件，其中包含一个控制台和一个使用log4j2的文件追加器。
(Apache网站的信息太多了，快把我累死了。)
当前回答
下面是我简单的log4j2.xml，它打印到控制台并写入到一个每日滚动文件:
// java
private static final Logger LOGGER = LogManager.getLogger(MyClass.class);
// log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Properties>
<Property name="logPath">target/cucumber-logs</Property>
<Property name="rollingFileName">cucumber</Property>
</Properties>
<Appenders>
<Console name="console" target="SYSTEM_OUT">
<PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
</Console>
<RollingFile name="rollingFile" fileName="${logPath}/${rollingFileName}.log" filePattern="${logPath}/${rollingFileName}_%d{yyyy-MM-dd}.log">
<PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
<Policies>
<!-- Causes a rollover if the log file is older than the current JVM's start time -->
<OnStartupTriggeringPolicy />
<!-- Causes a rollover once the date/time pattern no longer applies to the active file -->
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG" additivity="false">
<AppenderRef ref="console" />
<AppenderRef ref="rollingFile" />
</Root>
</Loggers>
</Configuration>
TimeBasedTriggeringPolicy interval (integer) - How often a rollover should occur based on the most specific time unit in the date pattern. For example, with a date pattern with hours as the most specific item and and increment of 4 rollovers would occur every 4 hours. The default value is 1. modulate (boolean) - Indicates whether the interval should be adjusted to cause the next rollover to occur on the interval boundary. For example, if the item is hours, the current hour is 3 am and the interval is 4 then the first rollover will occur at 4 am and then next ones will occur at 8 am, noon, 4pm, etc. Source: https://logging.apache.org/log4j/2.x/manual/appenders.html
输出:
[INFO ] 2018-07-21 12:03:47,412 ScenarioHook.beforeScenario() - Browser=CHROME32_NOHEAD
[INFO ] 2018-07-21 12:03:48,623 ScenarioHook.beforeScenario() - Screen Resolution (WxH)=1366x768
[DEBUG] 2018-07-21 12:03:52,125 HomePageNavigationSteps.I_Am_At_The_Home_Page() - Base URL=http://simplydo.com/projector/
[DEBUG] 2018-07-21 12:03:52,700 NetIncomeProjectorSteps.I_Enter_My_Start_Balance() - Start Balance=348000
每天都会创建一个新的日志文件，前一天会自动重命名为:
cucumber_yyyy-MM-dd.log
在Maven项目中，您可以将log4j2.xml放在src/main/resources或src/test/resources中。
其他回答
有很好的答案，但如果你想给你的控制台日志上色，你可以使用模式:
<PatternLayout pattern="%style{%date{DEFAULT}}{yellow}
[%t] %highlight{%-5level}{FATAL=bg_red, ERROR=red, WARN=yellow, INFO=green} %logger{36} - %message\n"/>
完整的log4j2文件是:
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Properties>
<Property name="APP_LOG_ROOT">/opt/test/log</Property>
</Properties>
<Appenders>
<Console name="ConsoleAppender" target="SYSTEM_OUT">
<PatternLayout pattern="%style{%date{DEFAULT}}{yellow}
[%t] %highlight{%-5level}{FATAL=bg_red, ERROR=red, WARN=yellow, INFO=green} %logger{36} - %message\n"/>
</Console>
<RollingFile name="XML_ROLLING_FILE_APPENDER"
fileName="${APP_LOG_ROOT}/appName.log"
filePattern="${APP_LOG_ROOT}/appName-%d{yyyy-MM-dd}-%i.log.gz">
<PatternLayout pattern="%d{DEFAULT} [%t] %-5level %logger{36} - %msg%n"/>
<Policies>
<SizeBasedTriggeringPolicy size="19500KB"/>
</Policies>
</RollingFile>
</Appenders>
<Loggers>
<Root level="error">
<AppenderRef ref="ConsoleAppender"/>
</Root>
<Logger name="com.compName.projectName" level="debug">
<AppenderRef ref="XML_ROLLING_FILE_APPENDER"/>
</Logger>
</Loggers>
</Configuration>
对数是这样的
下面是我简单的log4j2.xml，它打印到控制台并写入到一个每日滚动文件:
// java
private static final Logger LOGGER = LogManager.getLogger(MyClass.class);
// log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Properties>
<Property name="logPath">target/cucumber-logs</Property>
<Property name="rollingFileName">cucumber</Property>
</Properties>
<Appenders>
<Console name="console" target="SYSTEM_OUT">
<PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
</Console>
<RollingFile name="rollingFile" fileName="${logPath}/${rollingFileName}.log" filePattern="${logPath}/${rollingFileName}_%d{yyyy-MM-dd}.log">
<PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
<Policies>
<!-- Causes a rollover if the log file is older than the current JVM's start time -->
<OnStartupTriggeringPolicy />
<!-- Causes a rollover once the date/time pattern no longer applies to the active file -->
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG" additivity="false">
<AppenderRef ref="console" />
<AppenderRef ref="rollingFile" />
</Root>
</Loggers>
</Configuration>
TimeBasedTriggeringPolicy interval (integer) - How often a rollover should occur based on the most specific time unit in the date pattern. For example, with a date pattern with hours as the most specific item and and increment of 4 rollovers would occur every 4 hours. The default value is 1. modulate (boolean) - Indicates whether the interval should be adjusted to cause the next rollover to occur on the interval boundary. For example, if the item is hours, the current hour is 3 am and the interval is 4 then the first rollover will occur at 4 am and then next ones will occur at 8 am, noon, 4pm, etc. Source: https://logging.apache.org/log4j/2.x/manual/appenders.html
输出:
[INFO ] 2018-07-21 12:03:47,412 ScenarioHook.beforeScenario() - Browser=CHROME32_NOHEAD
[INFO ] 2018-07-21 12:03:48,623 ScenarioHook.beforeScenario() - Screen Resolution (WxH)=1366x768
[DEBUG] 2018-07-21 12:03:52,125 HomePageNavigationSteps.I_Am_At_The_Home_Page() - Base URL=http://simplydo.com/projector/
[DEBUG] 2018-07-21 12:03:52,700 NetIncomeProjectorSteps.I_Enter_My_Start_Balance() - Start Balance=348000
每天都会创建一个新的日志文件，前一天会自动重命名为:
cucumber_yyyy-MM-dd.log
在Maven项目中，您可以将log4j2.xml放在src/main/resources或src/test/resources中。
log4j2有一个非常灵活的配置系统(在我看来，这是一种干扰而不是帮助)，您甚至可以使用JSON。参考https://logging.apache.org/log4j/2.x/manual/configuration.html。
就我个人而言，我最近才开始使用log4j2，但我倾向于使用“严格的XML”配置(即使用属性而不是元素名称)，这可以通过模式验证。
下面是我使用自动配置和严格模式的简单示例，使用“属性”设置文件名:
<?xml version="1.0" encoding="UTF-8"?>
<Configuration monitorinterval="30" status="info" strict="true">
<Properties>
<Property name="filename">log/CelsiusConverter.log</Property>
</Properties>
<Appenders>
<Appender type="Console" name="Console">
<Layout type="PatternLayout" pattern="%d %p [%t] %m%n" />
</Appender>
<Appender type="Console" name="FLOW">
<Layout type="PatternLayout" pattern="%C{1}.%M %m %ex%n" />
</Appender>
<Appender type="File" name="File" fileName="${filename}">
<Layout type="PatternLayout" pattern="%d %p %C{1.} [%t] %m%n" />
</Appender>
</Appenders>
<Loggers>
<Root level="debug">
<AppenderRef ref="File" />
<AppenderRef ref="Console" />
<!-- Use FLOW to trace down exact method sending the msg -->
<!-- <AppenderRef ref="FLOW" /> -->
</Root>
</Loggers>
</Configuration>
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
</Console>
<File name="MyFile" fileName="all.log" immediateFlush="false" append="false">
<PatternLayout pattern="%d{yyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</File>
</Appenders>
<Loggers>
<Root level="debug">
<AppenderRef ref="Console" />
<AppenderRef ref="MyFile"/>
</Root>
</Loggers>
</Configuration>
注:
将以下内容放入配置文件中。 将配置文件命名为log4j2.xml 将log4j2.xml放在类路径下的文件夹中(即您的源文件夹“src”) 使用Logger Logger = LogManager.getLogger();初始化记录器 我确实设置了immediateFlush="false"，因为这对SSD的寿命更好。如果您需要立即在日志文件中记录日志，则删除该参数或将其设置为true
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