1.?按日志級別區分文件輸出

有些人習慣按日志信息級別輸出到不同名稱的文件中，如info.log，error.log，warn.log等，在log4j2中可通過配置Filters來實現。

假定需求是把INFO及以下級別的信息輸出到info.log，WARN和ERROR級別的信息輸出到error.log，FATAL級別輸出到fatal.log，配置文件如下：

<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>??

測試代碼：

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 異步寫日志

配置文件：

<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>??

測試代碼：

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 輸出到MongoDB

添加依賴：

<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>??

配置文件：

<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 輸出到Flume

Flume配置(flume-conf.properties)

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??

啟動Flume（注：測試環境為windows）

flume-ng.cmd?agent?--conf?../conf/?--conf-file?../conf/flume-conf.properties?-name?agent1??

添加依賴：

<dependency>??

????<groupId>org.apache.logging.log4j</groupId>??

????<artifactId>log4j-flume-ng</artifactId>??

????<version>2.5</version>??

</dependency>??

配置文件：

<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>?

總結

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