使用控制台和文件附加器的非常简单的 log4j2 XML 配置文件
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Very simple log4j2 XML configuration file using Console and File appender
提问by Thorsten Niehues
I'd like a very simple XML configuration file with a console and a file appender using log4j2.
我想要一个非常简单的 XML 配置文件，它带有一个控制台和一个使用 log4j2 的文件附加器。
(The Apache Website is killing me with much Information.)
（Apache 网站的大量信息让我很崩溃。）
回答by Thorsten Niehues
<?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>
Notes:
笔记：
- Put the following content in your configuration file.
- Name the configuration file log4j2.xml
- Put the log4j2.xml in a folder which is in the class-path (i.e. your source folder "src")
- Use
Logger logger = LogManager.getLogger();to initialize your logger - I did set the immediateFlush="false"since this is better for SSD lifetime. If you need the log right away in your log-file remove the parameter or set it to true
- 将以下内容放入您的配置文件中。
- 将配置文件命名为 log4j2.xml
- 将 log4j2.xml 放在类路径中的文件夹中（即您的源文件夹“src”）
- 使用
Logger logger = LogManager.getLogger();初始化您的记录器 - 我确实设置了immediateFlush="false"因为这对SSD 寿命更好。如果您需要立即在日志文件中记录日志，请删除该参数或将其设置为 true
回答by silver
Here is my simplistic log4j2.xmlthat prints to console and writes to a daily rolling file:
这是我log4j2.xml打印到控制台并写入每日滚动文件的简单方法：
// 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
基于时间的触发策略
间隔（整数）- 根据日期模式中最具体的时间单位，翻转应该发生的频率。例如，日期模式以小时为最具体的项目，并且每 4 小时会发生 4 次翻转。默认值为 1。
modulate (boolean)- 指示是否应该调整间隔以导致在间隔边界上发生下一次翻转。例如，如果项目是小时，当前小时是凌晨 3 点，间隔是 4，那么第一次翻转将在凌晨 4 点发生，然后下一次翻转将在上午 8 点、中午、下午 4 点等发生。
来源：https: //logging.apache.org/log4j/2.x/manual/appenders.html
Output:
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
A new log file will be created daily with previous day automatically renamed to:
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
cucumber_yyyy-MM-dd.log
In a Maven project, you would put the log4j2.xmlin src/main/resourcesorsrc/test/resources.
在 Maven 项目中，您可以将log4j2.xmlinsrc/main/resources或src/test/resources.
回答by Christof K?lin
log4j2 has a very flexible configuration system (which IMHO is more a distraction than a help), you can even use JSON. See https://logging.apache.org/log4j/2.x/manual/configuration.htmlfor a reference.
log4j2 有一个非常灵活的配置系统（恕我直言，这更像是一种干扰而不是帮助），您甚至可以使用 JSON。请参阅https://logging.apache.org/log4j/2.x/manual/configuration.html以获取参考。
Personally, I just recently started using log4j2, but I'm tending toward the "strict XML" configuration (that is, using attributes instead of element names), which can be schema-validated.
就我个人而言，我最近才开始使用 log4j2，但我倾向于“严格的 XML”配置（即，使用属性而不是元素名称），它可以进行模式验证。
Here is my simple example using autoconfiguration and strict mode, using a "Property" for setting the filename:
这是我使用自动配置和严格模式的简单示例，使用“属性”来设置文件名：
<?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>
