0004-log4j2日志输出配置

引入依赖:

核心依赖

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.12.0</version>
</dependency>

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>2.12.0</version>
</dependency>

在 springboot 中由于已经存在 spring-boot-starter-log4j2 了,所以我们直接使用spring-boot-starter-log4j2就行了(注意排除spring默认的日志处理logback)

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <!-- 排除spring boot默认日志logback -->
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<!-- 引入log4j2依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>

添加配置文件

默认情况下,Log4j2在classpath下查找名为log4j2.xml的配置文件。你也可以使用Java启动命令指定配置文件的全路径。-Dlog4j.configurationFile=opt/demo/log4j2.xml,你还可以使用Java代码指定配置文件路径

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.LoggerContext;

import java.io.File;

public static void main(String[] args) {

    LoggerContext loggerContext = (LoggerContext) LogManager.getContext(false);
    File file = new File("opt/demo/log4j2.xml");
    loggerContext.setConfigLocation(file.toURI());

}

具体实战

这里采用在classpath下创建名为log4j2.xml的配置文件

  1. 引入依赖

  2. 配置log4j2.xml文件(在resources下建立log4j2.xml文件)

    <?xml version="1.0" encoding="UTF-8"?>
    <Configuration>
    
        <Properties>
            <!-- 日志输出级别 -->
            <Property name="LOG_INFO_LEVEL" value="info"/>
            <!-- error级别日志 -->
            <Property name="LOG_ERROR_LEVEL" value="error"/>
            <!-- 在当前目录下创建名为log目录做日志存放的目录 -->
            <Property name="LOG_HOME" value="./log"/>
            <!-- 档案日志存放目录 -->
            <Property name="LOG_ARCHIVE" value="./log/archive"/>
            <!-- 模块名称, 影响日志配置名,日志文件名,根据自己项目进行配置 -->
            <Property name="LOG_MODULE_NAME" value="spring-boot"/>
            <!-- 日志文件大小,超过这个大小将被压缩 -->
            <Property name="LOG_MAX_SIZE" value="100 MB"/>
            <!-- 保留多少天以内的日志 -->
            <Property name="LOG_DAYS" value="15"/>
            <!--输出日志的格式:%d表示日期,%thread表示线程名,%-5level:级别从左显示5个字符宽度, %msg:日志消息,%n是换行符 -->
            <Property name="LOG_PATTERN" value="%d{yyyy-MM-dd hh:mm:ss.SSS} | %-5level | [%t] |%logger{50} | %L | : %msg%n"/>
            <!--interval属性用来指定多久滚动一次-->
            <Property name="TIME_BASED_INTERVAL" value="1"/>
        </Properties>
    
        <Appenders>
            <!-- 控制台输出 -->
            <Console name="STDOUT" target="SYSTEM_OUT">
                <!--输出日志的格式-->
                <PatternLayout pattern="${LOG_PATTERN}"/>
                <!--控制台只输出level及其以上级别的信息(onMatch),其他的直接拒绝(onMismatch)-->
                <ThresholdFilter level="${LOG_INFO_LEVEL}" onMatch="ACCEPT" onMismatch="DENY"/>
            </Console>
    
            <!-- 这个会打印出所有的info级别以上,error级别一下的日志,每次大小超过size或者满足TimeBasedTriggeringPolicy,则日志会自动存入按年月日建立的文件夹下面并进行压缩,作为存档-->
            <RollingRandomAccessFile name="RollingRandomAccessFileInfo"
                                     fileName="${LOG_HOME}/${LOG_MODULE_NAME}-infoLog.log"
                                     filePattern="${LOG_ARCHIVE}/${LOG_MODULE_NAME}-infoLog-%d{yyyy-MM-dd}-%i.log.gz">
                <Filters>
                    <!--如果是error级别拒绝,设置 onMismatch="NEUTRAL" 可以让日志经过后续的过滤器-->
                    <ThresholdFilter level="${LOG_ERROR_LEVEL}" onMatch="DENY" onMismatch="NEUTRAL"/>
                    <!--如果是info\warn输出-->
                    <ThresholdFilter level="${LOG_INFO_LEVEL}" onMatch="ACCEPT" onMismatch="DENY"/>
                </Filters>
                <PatternLayout pattern="${LOG_PATTERN}"/>
                <Policies>
                    <!--interval属性用来指定多久滚动一次,根据当前filePattern设置是1天滚动一次-->
                    <TimeBasedTriggeringPolicy interval="${TIME_BASED_INTERVAL}"/>
                    <SizeBasedTriggeringPolicy size="${LOG_MAX_SIZE}"/>
                </Policies>
                <!-- DefaultRolloverStrategy属性如不设置,则默认同一文件夹下最多保存7个文件-->
                <DefaultRolloverStrategy max="${LOG_DAYS}"/>
            </RollingRandomAccessFile>
    
            <!--只记录error级别以上的日志,与info级别的日志分不同的文件保存-->
            <RollingRandomAccessFile name="RollingRandomAccessFileError"
                                     fileName="${LOG_HOME}/${LOG_MODULE_NAME}-errorLog.log"
                                     filePattern="${LOG_ARCHIVE}/${LOG_MODULE_NAME}-errorLog-%d{yyyy-MM-dd}-%i.log.gz">
                <Filters>
                    <ThresholdFilter level="${LOG_ERROR_LEVEL}" onMatch="ACCEPT" onMismatch="DENY"/>
                </Filters>
                <PatternLayout pattern="${LOG_PATTERN}"/>
                <Policies>
                    <TimeBasedTriggeringPolicy interval="${TIME_BASED_INTERVAL}"/>
                    <SizeBasedTriggeringPolicy size="${LOG_MAX_SIZE}"/>
                </Policies>
                <DefaultRolloverStrategy max="${LOG_DAYS}"/>
            </RollingRandomAccessFile>
    
        </Appenders>
    
        <Loggers>
            <!-- 开发环境使用 -->
    <!--        <Root level="${LOG_INFO_LEVEL}">-->
    <!--            <AppenderRef ref="STDOUT"/>-->
    <!--        </Root>-->
    
            <!-- 测试,生产环境使用 -->
            <Root level="${LOG_INFO_LEVEL}">
                <AppenderRef ref="RollingRandomAccessFileInfo"/>
                <AppenderRef ref="RollingRandomAccessFileError"/>
            </Root>
        </Loggers>
    
    </Configuration>
    
  3. 测试

    启动项目

    2021-10-12 03:57:42.716 | INFO  | [main] |com.zhoust.fastdome.FastDomeApplication | 50 | : Starting FastDomeApplication on DESKTOP-27SPPG5 with PID 7940 (D:\workspace\git\zhoustcomm\fast-dome\target\classes started by zhoushengtao in D:\workspace\git\zhoustcomm)
    2021-10-12 03:57:42.725 | INFO  | [main] |com.zhoust.fastdome.FastDomeApplication | 675 | : No active profile set, falling back to default profiles: default
    2021-10-12 03:57:44.026 | INFO  | [main] |org.springframework.boot.web.embedded.tomcat.TomcatWebServer | 90 | : Tomcat initialized with port(s): 8088 (http)
    2021-10-12 03:57:44.037 | INFO  | [main] |org.apache.coyote.http11.Http11NioProtocol | 173 | : Initializing ProtocolHandler ["http-nio-8088"]
    2021-10-12 03:57:44.050 | INFO  | [main] |org.apache.catalina.core.StandardService | 173 | : Starting service [Tomcat]
    2021-10-12 03:57:44.050 | INFO  | [main] |org.apache.catalina.core.StandardEngine | 173 | : Starting Servlet Engine: Apache Tomcat/9.0.13
    2021-10-12 03:57:44.056 | INFO  | [main] |org.apache.catalina.core.AprLifecycleListener | 173 | : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [D:\codersoft\jdk1.8.0_20\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;D:\codersoft\jdk1.8.0_20\bin;D:\codersoft\maven\apache-maven-3.5.0\bin;D:\codersoft\Git\bin;C:\Users\zhoushengtao\AppData\Local\Microsoft\WindowsApps;;.]
    2021-10-12 03:57:44.180 | INFO  | [main] |org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/] | 173 | : Initializing Spring embedded WebApplicationContext
    2021-10-12 03:57:44.181 | INFO  | [main] |org.springframework.web.context.ContextLoader | 296 | : Root WebApplicationContext: initialization completed in 1418 ms
    2021-10-12 03:57:44.236 | INFO  | [main] |com.zhoust.fastdome.filter.MyFilter | 24 | : >>>>>>>>>>过滤器出生<<<<<<<<<<<<
    2021-10-12 03:57:45.342 | INFO  | [main] |org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor | 171 | : Initializing ExecutorService 'applicationTaskExecutor'
    2021-10-12 03:57:45.613 | INFO  | [main] |org.apache.coyote.http11.Http11NioProtocol | 173 | : Starting ProtocolHandler ["http-nio-8088"]
    2021-10-12 03:57:45.624 | INFO  | [main] |org.apache.tomcat.util.net.NioSelectorPool | 173 | : Using a shared selector for servlet write/read
    2021-10-12 03:57:45.638 | INFO  | [main] |org.springframework.boot.web.embedded.tomcat.TomcatWebServer | 204 | : Tomcat started on port(s): 8088 (http) with context path ''
    2021-10-12 03:57:45.641 | INFO  | [main] |com.zhoust.fastdome.FastDomeApplication | 59 | : Started FastDomeApplication in 3.315 seconds (JVM running for 4.768)
    
    

源码地址

参考来源

作者:JourWon
链接:https://www.jianshu.com/p/1b04924d8a1f

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