详解log4j2(下)

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转载地址 http://blog.csdn.net/autfish/article/details/51244787

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：

<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>

测试代码：

  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
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>

3 输出到MongoDB

添加依赖：

<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 输出到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

启动Flume（注：测试环境为windows）

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

    <dependency>          <groupId>org.apache.logging.log4j</groupId>          <artifactId>log4j-flume-ng</artifactId>          <version>2.5</version>      </dependency>

配置

<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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