Log4j2 實例

1.Maven 配置

<!-- 日誌 -->
<dependency>  
    <groupId>org.slf4j</groupId>  
    <artifactId>slf4j-api</artifactId>  
    <version>1.7.13</version>  
</dependency>  
<dependency>  
    <groupId>org.slf4j</groupId>  
    <artifactId>jcl-over-slf4j</artifactId>  
    <version>1.7.13</version>  
    <scope>runtime</scope>  
</dependency>
<!-- 橋接：告訴Slf4j使用Log4j2 -->
<dependency> 
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-slf4j-impl</artifactId>
    <version>2.2</version>
</dependency>
<!-- 橋接：告訴commons logging使用Log4j2 -->
<dependency> 
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-jcl</artifactId>
    <version>2.2</version>
</dependency>
<!--須要使用log4j2的AsyncLogger須要包含disruptor-->  
<dependency>  
    <groupId>com.lmax</groupId>  
    <artifactId>disruptor</artifactId>  
    <version>3.2.0</version>  
</dependency>
<!-- log4j2 -->
<dependency>  
    <groupId>org.apache.logging.log4j</groupId>  
    <artifactId>log4j-api</artifactId>  
    <version>2.2</version>  
</dependency>  
<dependency>  
    <groupId>org.apache.logging.log4j</groupId>  
    <artifactId>log4j-core</artifactId>  
    <version>2.2</version>  
</dependency>  
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-web</artifactId>
    <version>2.2</version>
</dependency>

2.web.xml配置

<!--對於log4j2，Servlet2.5之前的版本須要-->  
<listener>  
   <listener-class>org.apache.logging.log4j.web.Log4jServletContextListener</listener-class>  
</listener>  
<filter>  
   <filter-name>log4jServletFilter</filter-name>  
   <filter-class>org.apache.logging.log4j.web.Log4jServletFilter</filter-class>  
</filter>  
<filter-mapping>  
   <filter-name>log4jServletFilter</filter-name>  
   <url-pattern>/*</url-pattern>  
   <dispatcher>REQUEST</dispatcher>  
   <dispatcher>FORWARD</dispatcher>  
   <dispatcher>INCLUDE</dispatcher>  
   <dispatcher>ERROR</dispatcher>  
</filter-mapping>  

<!--log4j2再也不支持properties文件了，只支持xml，json或是yaml，默認在src/main/resources下查找。自定義位置，以下-->
<context-param>  
  <param-name>log4jConfiguration</param-name>  
  <param-value>/WEB-INF/classes/log4j2.xml</param-value>  
</context-param>

3.實例

<?xml version="1.0" encoding="UTF-8"?>
<!--日誌級別以及優先級排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
<!--Configuration後面的status，這個用於設置log4j2自身內部的信息輸出，能夠不設置，當設置成trace時，你會看到log4j2內部各類詳細輸出-->
<!--monitorInterval：Log4j可以自動檢測修改配置 文件和從新配置自己，設置間隔秒數-->
<configuration status="WARN" monitorInterval="30">
    <properties><!-- 定義常量 -->  
        <property name="LOG_HOME">logs</property>  
        <property name="FILE_NAME">ams.bankage</property>
    </properties>    
    <!--先定義全部的appender-->
    <appenders>
    <!--這個輸出控制檯的配置-->
        <console name="Console" target="SYSTEM_OUT">
        <!--輸出日誌的格式-->
            <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss.SSS} [%t] - [%-5level] [%X{SEQ}] %logger{36} %L %M - %msg%xEx%n"/>
        </console>
        <!-- 這個會打印出全部的info及如下級別的信息，每次大小超過size，則這size大小的日誌會自動存入按年份-月份創建的文件夾下面並進行壓縮，做爲存檔-->
        <RollingFile name="RollingFileInfo" fileName="${LOG_HOME}/${FILE_NAME}-info.log"
                     filePattern="${LOG_HOME}/${FILE_NAME}-info-%d{yyyy-MM-dd}-%i.log">
            <!--控制檯只輸出level及以上級別的信息（onMatch），其餘的直接拒絕（onMismatch）-->        
            <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss.SSS} [%t] - [%-5level] [%X{SEQ}] %logger{36} %L %M - %msg%xEx%n"/>
            <Policies>
                <TimeBasedTriggeringPolicy/>
                <SizeBasedTriggeringPolicy size="100 MB"/>
            </Policies>
        </RollingFile>
        <RollingFile name="RollingFileError" fileName="${LOG_HOME}/${FILE_NAME}-error.log"
                     filePattern="${LOG_HOME}/${FILE_NAME}-error-%d{yyyy-MM-dd}-%i.log">
            <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss.SSS} [%t] - [%-5level] [%X{SEQ}] %logger{36} %L %M - %msg%xEx%n"/>
            <Policies>
                <TimeBasedTriggeringPolicy/>
                <SizeBasedTriggeringPolicy size="100 MB"/>
            </Policies>
        </RollingFile>

    </appenders>
    <!--而後定義logger，只有定義了logger並引入的appender，appender纔會生效-->
    <loggers>
        <Root level="INFO">
            <appender-ref ref="Console"/>
        </Root>

        <!-- 將業務dao接口填寫進去,並用控制檯輸出便可 -->  
        <AsyncLogger  name="com.jf.ams" level="INFO" additivity="false" includeLocation="true">
            <appender-ref ref="Console"/>
            <AppenderRef ref="RollingFileInfo" />   
            <AppenderRef ref="RollingFileError"/>
        </AsyncLogger>

        <!-- 將業務dao接口填寫進去,並用控制檯輸出便可 -->  
        <AsyncLogger name="com.jf.ams.bankpage.dao" level="DEBUG" additivity="false" includeLocation="true">  
            <appender-ref ref="Console"/>
        </AsyncLogger>

        <!--過濾掉spring和mybatis的一些無用的DEBUG信息-->
        <logger name="org.springframework.core" level="info"/>
        <logger name="org.springframework.beans" level="info"/>
        <logger name="org.springframework.context" level="info"/>
        <logger name="org.springframework.web" level="info"/>
    </loggers>
</configuration>