个人笔记Spring-boot 整合log4j2

最新推荐文章于 2025-03-25 14:59:53 发布

飘茗

最新推荐文章于 2025-03-25 14:59:53 发布

阅读量2.1k

点赞数 1

分类专栏： java spring boot

本文链接：https://blog.youkuaiyun.com/rainbow_lasia/article/details/107321034

版权

java 同时被 2 个专栏收录

22 篇文章

订阅专栏

spring boot

5 篇文章

订阅专栏

今天我整合了log4j2到spring-boot，排了一整天的雷，记录一下。

整合过程很简单，

1，排除spring-boot原有的spring-boot-starter-logging，将log4j2的依赖引入

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>

因为其他依赖里也会引这个，可以做个全局排除

<!--全局排除spring-boot-starter-logging内的所有依赖-->

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-logging</artifactId>

<exclusions>

<exclusion>

<groupId>*</groupId>

<artifactId>*</artifactId>

</exclusion>

</exclusions>

</dependency>

2，配置log4j2.xml， yml文件也可以

<?xml version="1.0" encoding="UTF-8"?>
<configuration status="OFF">
    <appenders>

        <Console name="Console" target="SYSTEM_OUT">
            <!--只接受程序中DEBUG级别的日志进行处理-->
            <ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="[%d{HH:mm:ss.SSS}] %-5level %class{36} %L %M - %msg%xEx%n"/>
        </Console>

        <!--处理DEBUG级别的日志，并把该日志放到logs/debug.log文件中-->
        <!--打印出DEBUG级别日志，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档-->
        <RollingFile name="RollingFileDebug" fileName="./logs/debug.log"
                     filePattern="logs/$${date:yyyy-MM}/debug-%d{yyyy-MM-dd}-%i.log.gz">
            <Filters>
                <ThresholdFilter level="DEBUG"/>
                <ThresholdFilter level="INFO" onMatch="DENY" onMismatch="NEUTRAL"/>
            </Filters>
            <PatternLayout
                    pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="500 MB"/>
                <TimeBasedTriggeringPolicy/>
            </Policies>
        </RollingFile>

        <!--处理INFO级别的日志，并把该日志放到logs/info.log文件中-->
        <RollingFile name="RollingFileInfo" fileName="./logs/info.log"
                     filePattern="logs/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log.gz">
            <Filters>
                <!--只接受INFO级别的日志，其余的全部拒绝处理-->
                <ThresholdFilter level="INFO"/>
                <ThresholdFilter level="WARN" onMatch="DENY" onMismatch="NEUTRAL"/>
            </Filters>
            <PatternLayout
                    pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="500 MB"/>
                <TimeBasedTriggeringPolicy/>
            </Policies>
        </RollingFile>

        <!--处理WARN级别的日志，并把该日志放到logs/warn.log文件中-->
        <RollingFile name="RollingFileWarn" fileName="./logs/warn.log"
                     filePattern="logs/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log.gz">
            <Filters>
                <ThresholdFilter level="WARN"/>
                <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL"/>
            </Filters>
            <PatternLayout
                    pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="500 MB"/>
                <TimeBasedTriggeringPolicy/>
            </Policies>
        </RollingFile>

        <!--处理error级别的日志，并把该日志放到logs/error.log文件中-->
        <RollingFile name="RollingFileError" fileName="./logs/error.log"
                     filePattern="logs/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log.gz">
            <ThresholdFilter level="ERROR"/>
            <PatternLayout
                    pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="500 MB"/>
                <TimeBasedTriggeringPolicy/>
            </Policies>
        </RollingFile>

        <!--druid的日志记录追加器-->
        <RollingFile name="druidSqlRollingFile" fileName="./logs/druid-sql.log"
                     filePattern="logs/$${date:yyyy-MM}/api-%d{yyyy-MM-dd}-%i.log.gz">
            <PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %L %M - %msg%xEx%n"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="500 MB"/>
                <TimeBasedTriggeringPolicy/>
            </Policies>
        </RollingFile>
    </appenders>

    <loggers>
        <root level="DEBUG">
            <appender-ref ref="Console"/>
            <appender-ref ref="RollingFileInfo"/>
            <appender-ref ref="RollingFileWarn"/>
            <appender-ref ref="RollingFileError"/>
            <appender-ref ref="RollingFileDebug"/>
            <appender-ref ref="druidSqlRollingFile"/>
        </root>

        <!--记录druid-sql的记录-->
        <logger name="druid.sql.Statement" level="debug" additivity="false">
            <appender-ref ref="druidSqlRollingFile"/>
        </logger>
        <logger name="druid.sql" level="debug" additivity="false">
            <appender-ref ref="druidSqlRollingFile"/>
        </logger>
        <logger name="druid.sql" level="debug" additivity="false">
            <appender-ref ref="Console"/>
        </logger>
        <logger name="druid.sql.Statement" level="debug" additivity="false">
            <appender-ref ref="Console"/>
        </logger>

        <!--log4j2 自带过滤日志-->
        <Logger name="org.apache.catalina.startup.DigesterFactory" level="error" />
        <Logger name="org.apache.catalina.util.LifecycleBase" level="error" />
        <Logger name="org.apache.coyote.http11.Http11NioProtocol" level="warn" />
        <logger name="org.apache.sshd.common.util.SecurityUtils" level="warn"/>
        <Logger name="org.apache.tomcat.util.net.NioSelectorPool" level="warn" />
        <Logger name="org.crsh.plugin" level="warn" />
        <logger name="org.crsh.ssh" level="warn"/>
        <Logger name="org.eclipse.jetty.util.component.AbstractLifeCycle" level="error" />
        <Logger name="org.hibernate.validator.internal.util.Version" level="warn" />
        <logger name="org.springframework.boot.actuate.autoconfigure.CrshAutoConfiguration" level="warn"/>
        <logger name="org.springframework.boot.actuate.endpoint.jmx" level="warn"/>
        <logger name="org.thymeleaf" level="warn"/>
    </loggers>
</configuration>

3，在application.yml中引入配置文件

# log4j2 日志配置

logging:

config: classpath:log4j2.xml

本以为这样直接启动就可以了，可发现启动不了了·····

报这个错

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/core/appender/rolling/DirectFileRolloverStrategy

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:760)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)

at java.net.URLClassLoader.access$100(URLClassLoader.java:73)

at java.net.URLClassLoader$1.run(URLClassLoader.java:367)

at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:360)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at org.apache.logging.log4j.core.config.plugins.util.PluginRegistry.decodeCacheFiles(PluginRegistry.java:181)

at org.apache.logging.log4j.core.config.plugins.util.PluginRegistry.loadFromMainClassLoader(PluginRegistry.java:119)

at org.apache.logging.log4j.core.config.plugins.util.PluginManager.collectPlugins(PluginManager.java:132)

at org.apache.logging.log4j.core.pattern.PatternParser.<init>(PatternParser.java:131)

at org.apache.logging.log4j.core.pattern.PatternParser.<init>(PatternParser.java:112)

at org.apache.logging.log4j.core.layout.PatternLayout.createPatternParser(PatternLayout.java:209)

at org.apache.logging.log4j.core.layout.PatternLayout.createSerializer(PatternLayout.java:123)

at org.apache.logging.log4j.core.layout.PatternLayout.<init>(PatternLayout.java:111)

at org.apache.logging.log4j.core.layout.PatternLayout.<init>(PatternLayout.java:58)

at org.apache.logging.log4j.core.layout.PatternLayout$Builder.build(PatternLayout.java:494)

at org.apache.logging.log4j.core.config.AbstractConfiguration.setToDefault(AbstractConfiguration.java:567)

at org.apache.logging.log4j.core.config.DefaultConfiguration.<init>(DefaultConfiguration.java:47)

at org.apache.logging.log4j.core.LoggerContext.<init>(LoggerContext.java:81)

at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:171)

at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:145)

at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:70)

at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:57)

at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:147)

at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)

at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)

at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:103)

at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:43)

at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:42)

at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29)

at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:358)

at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)

at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)

at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:273)

at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:179)

at com.gwmfc.cheetah.CheetahApplication.main(CheetahApplication.java:27)

Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.core.appender.rolling.DirectFileRolloverStrategy

at java.net.URLClassLoader$1.run(URLClassLoader.java:372)

at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:360)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

... 42 more

Disconnected from the target VM, address: '127.0.0.1:13969', transport: 'socket'

Process finished with exit code 1

百思不得其解，就去问了前辈，前辈推荐这个网站

https://www.findjar.com/class/com/groupbyinc/flux/common/apache/logging/log4j/core/appender/rolling/DirectFileRolloverStrategy.html

发现是差log4j-core这个依赖

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

</dependency>

然后又换了个错

"C:\Program Files\Java\jdk1.8\bin\java.exe" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:12999,suspend=y,server=n -javaagent:C:\Users\zhangjinqi\.IntelliJIdea2018.2\system\captureAgent\debugger-agent.jar=file:/C:/Users/zhangjinqi/AppData/Local/Temp/capture2882.props -Dfile.encoding=UTF-8 -classpath C:\Users\zhangjinqi\AppData\Local\Temp\classpath1497961761.jar com.gwmfc.cheetah.CheetahApplication

Connected to the target VM, address: '127.0.0.1:12999', transport: 'socket'

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

SLF4J: Defaulting to no-operation (NOP) logger implementation

SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...

Disconnected from the target VM, address: '127.0.0.1:12999', transport: 'socket'

Exception in thread "main" java.lang.ClassCastException: org.apache.logging.log4j.simple.SimpleLoggerContext cannot be cast to org.apache.logging.log4j.core.LoggerContext

at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.getLoggerContext(Log4J2LoggingSystem.java:265)

at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.beforeInitialize(Log4J2LoggingSystem.java:132)

at org.springframework.boot.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:230)

at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:209)

at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)

at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)

at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122)

at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:69)

at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:48)

at org.springframework.boot.SpringApplication.run(SpringApplication.java:292)

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)

at com.gwmfc.cheetah.CheetahApplication.main(CheetahApplication.java:27)

Process finished with exit code 1

网上说是需要排除这些依赖

log4j-to-slf4j-2.0.2.jar

log4j-to-slf4j-2.0.2-sources.jar

log4j-slf4j-impl-2.0.2.jar

log4j-slf4j-impl-2.0.2-sources.jar

我试了，没有任何卵用

不过是需要排除的（次日又加上试了一遍）

次日加回的错误

后来终于找到是还差一个依赖log4j-api

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

</dependency>

项目终于正常启动了，日志文件也生成了。

可我正在沾沾自喜时，发现这生成的Druid的SQL是什么啊···

SQL呢···

又陷入了绝境·····经过一下午的冥思苦想

发现application.yml的filters配置写的是slf4j``可现在用的是log4j 就改了

SQL就正常输出了，但日志配置文件还需要修改，以保证日志文件和控制台都有SQL和参数输出

<appender-ref ref="druidSqlRollingFile"/>

</logger>

<appender-ref ref="druidSqlRollingFile"/>

</logger>

<appender-ref ref="Console"/>

</logger>

<appender-ref ref="Console"/>

</logger>

后来发现用logger.info什么输出的都不生效

因为程序用的还是slf4j的写法

private static Logger logger = LoggerFactory.getLogger(HiveService.class);

需要换成

private static Logger logger= LogManager.getLogger(LogManager.ROOT_LOGGER_NAME);

生效

2020.7.13

后来同事发现自己Druid的mybatis数据源映射失败，没报错但项目启动失败，找了好久才找到。

我觉得是自己的日志框架有问题

try {

SpringApplication.run(CheetahApplication.class, args);

} catch (Exception e) {

logger.error(e);

// System.out.println(e);

}

在启动类加这个解决