详解log4j2(下)
1. 按日志级别区分文件输出有些人习惯按日志信息级别输出到不同名称的文件中，如info.log，error.log，warn.log等，在log4j2中可通过配置Filters来实现。
假定需求是把INFO及以下级别的信息输出到info.log，WARN和ERROR级别的信息输出到error.log，FATAL级别输出到fatal.log，配置文件如下：
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[*]<Configuration status="WARN" monitorInterval="300">
[*] <properties>
[*] <property name="LOG_HOME">D:/logs</property>
[*] </properties>
[*] <Appenders>
[*] <Console name="Console" target="SYSTEM_OUT">
[*] <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
[*] </Console>
[*]
[*] <RollingRandomAccessFile name="InfoFile"
[*] fileName="${LOG_HOME}/info.log"
[*] filePattern="${LOG_HOME}/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log">
[*] <Filters>
[*] <ThresholdFilter level="warn" onMatch="DENY" onMismatch="NEUTRAL" />
[*] <ThresholdFilter level="trace" onMatch="ACCEPT" onMismatch="DENY" />
[*] </Filters>
[*] <PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
[*] <Policies>
[*] <TimeBasedTriggeringPolicy />
[*] <SizeBasedTriggeringPolicy size="10 MB" />
[*] </Policies>
[*] <DefaultRolloverStrategy max="20" />
[*] </RollingRandomAccessFile>
[*]
[*] <RollingRandomAccessFile name="ErrorFile"
[*] fileName="${LOG_HOME}/error.log"
[*] filePattern="${LOG_HOME}/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log">
[*] <Filters>
[*] <ThresholdFilter level="fatal" onMatch="DENY" onMismatch="NEUTRAL" />
[*] <ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY" />
[*] </Filters>
[*] <PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
[*] <Policies>
[*] <TimeBasedTriggeringPolicy />
[*] <SizeBasedTriggeringPolicy size="10 MB" />
[*] </Policies>
[*] <DefaultRolloverStrategy max="20" />
[*] </RollingRandomAccessFile>
[*]
[*] <RollingRandomAccessFile name="FatalFile"
[*] fileName="${LOG_HOME}/fatal.log"
[*] filePattern="${LOG_HOME}/$${date:yyyy-MM}/fatal-%d{yyyy-MM-dd}-%i.log">
[*] <Filters>
[*] <ThresholdFilter level="fatal" onMatch="ACCEPT" onMismatch="DENY" />
[*] </Filters>
[*] <PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
[*] <Policies>
[*] <TimeBasedTriggeringPolicy />
[*] <SizeBasedTriggeringPolicy size="10 MB" />
[*] </Policies>
[*] <DefaultRolloverStrategy max="20" />
[*] </RollingRandomAccessFile>
[*] </Appenders>
[*]
[*] <Loggers>
[*] <Root level="trace">
[*] <AppenderRef ref="Console" />
[*] <AppenderRef ref="InfoFile" />
[*] <AppenderRef ref="ErrorFile" />
[*] <AppenderRef ref="FatalFile" />
[*] </Root>
[*] </Loggers>
[*]</Configuration>
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[*]public static void main(String[] args) {
[*] Logger logger = LogManager.getLogger(Client.class);
[*] logger.trace("trace level");
[*] logger.debug("debug level");
[*] logger.info("info level");
[*] logger.warn("warn level");
[*] logger.error("error level");
[*] logger.fatal("fatal level");
[*]}
2 异步写日志
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[*]<Configuration status="WARN" monitorInterval="300">
[*] <properties>
[*] <property name="LOG_HOME">D:/logs</property>
[*] <property name="FILE_NAME">mylog</property>
[*] </properties>
[*]
[*] <Appenders>
[*] <Console name="Console" target="SYSTEM_OUT">
[*] <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
[*] </Console>
[*] <RollingRandomAccessFile name="MyFile"
[*] fileName="${LOG_HOME}/${FILE_NAME}.log"
[*] filePattern="${LOG_HOME}/$${date:yyyy-MM}/${FILE_NAME}-%d{yyyy-MM-dd HH-mm}-%i.log">
[*] <PatternLayout
[*] pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
[*] <Policies>
[*] <TimeBasedTriggeringPolicy interval="1" />
[*] <SizeBasedTriggeringPolicy size="10 MB" />
[*] </Policies>
[*] <DefaultRolloverStrategy max="20" />
[*] </RollingRandomAccessFile>
[*] <Async name="Async">
[*] <AppenderRef ref="MyFile" />
[*] </Async>
[*] </Appenders>
[*]
[*] <Loggers>
[*] <Logger name="asynclog" level="trace" additivity="false" >
[*] <AppenderRef ref="Async" />
[*] </Logger>
[*] <Root level="error">
[*] <AppenderRef ref="Console" />
[*] </Root>
[*] </Loggers>
[*]</Configuration>
测试代码： view plain copyprint?https://code.csdn.net/assets/CODE_ico.pnghttps://code.csdn.net/assets/ico_fork.svg
[*]public static void main(String[] args) {
[*] Logger logger = LogManager.getLogger("asynclog");
[*] logger.trace("trace level");
[*] logger.debug("debug level");
[*] logger.info("info level");
[*] logger.warn("warn level");
[*] logger.error("error level");
[*] logger.fatal("fatal level");
[*]}
3 输出到MongoDB
添加依赖：
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[*]<dependency>
[*] <groupId>org.apache.logging.log4j</groupId>
[*] <artifactId>log4j-nosql</artifactId>
[*] <version>2.5</version>
[*]</dependency>
[*]<dependency>
[*] <groupId>org.mongodb</groupId>
[*] <artifactId>mongo-java-driver</artifactId>
[*] <version>3.2.2</version>
[*]</dependency>
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[*]<Configuration status="WARN" monitorInterval="300">
[*] <Appenders>
[*] <Console name="Console" target="SYSTEM_OUT">
[*] <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
[*] </Console>
[*]
[*] <NoSql name="databaseAppender">
[*] <MongoDb databaseName="test" collectionName="errorlog"
[*] server="localhost" port="27017" />
[*] </NoSql>
[*] </Appenders>
[*]
[*] <Loggers>
[*] <Logger name="mongolog" level="trace" additivity="false">
[*] <AppenderRef ref="databaseAppender" />
[*] </Logger>
[*] <Root level="error">
[*] <AppenderRef ref="Console" />
[*] </Root>
[*] </Loggers>
[*]</Configuration>
4 输出到Flume
Flume配置(flume-conf.properties)
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[*]agent1.sources=source1
[*]agent1.sinks=sink1
[*]agent1.channels=channel1
[*]
[*]agent1.sources.source1.type=avro
[*]agent1.sources.source1.channels=channel1
[*]agent1.sources.source1.bind=0.0.0.0
[*]agent1.sources.source1.port=41414
[*]
[*]agent1.sinks.sink1.type=file_roll
[*]agent1.sinks.sink1.sink.directory=D:/log
[*]agent1.sinks.sink1.channel=channel1
[*]agent1.sinks.sink1.sink.rollInterval=86400
[*]agent1.sinks.sink1.sink.batchSize=100
[*]agent1.sinks.sink1.sink.serializer=text
[*]agent1.sinks.sink1.sink.serializer.appendNewline = false
[*]
[*]agent1.channels.channel1.type=file
[*]agent1.channels.channel1.checkpointDir=D:/log/checkpoint
[*]agent1.channels.channel1.dataDirs=D:/log/data
启动Flume（注：测试环境为windows） view plain copyprint?https://code.csdn.net/assets/CODE_ico.pnghttps://code.csdn.net/assets/ico_fork.svg
[*]flume-ng.cmd agent --conf ../conf/ --conf-file ../conf/flume-conf.properties -name agent1
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[*]<dependency>
[*] <groupId>org.apache.logging.log4j</groupId>
[*] <artifactId>log4j-flume-ng</artifactId>
[*] <version>2.5</version>
[*]</dependency>
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[*]<Configuration status="WARN" monitorInterval="300">
[*] <Appenders>
[*] <Flume name="eventLogger" compress="false">
[*] <Agent host="127.0.0.1" port="41414" />
[*] <RFC5424Layout enterpriseNumber="18060" includeMDC="true" appName="MyApp" />
[*] </Flume>
[*] </Appenders>
[*] <Loggers>
[*] <Root level="trace">
[*] <AppenderRef ref="eventLogger" />
[*] </Root>
[*] </Loggers>
[*]</Configuration>
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