使用嵌入在 Spring Boot Web 应用程序中的 Tomcat 配置 lo4j2 日志记录答案

【问题标题】：Configuring lo4j2 logging with Tomcat embedded in a Spring Boot web app使用嵌入在 Spring Boot Web 应用程序中的 Tomcat 配置 lo4j2 日志记录
【发布时间】：2019-01-29 02:11:41
【问题描述】：

我已经成功地将我的 Spring Boot Web 应用配置为使用 log4j2 和下面的配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" monitorInterval="30">
<Properties>
    <Property name="LOG_PATTERN">
        %d{yyyy-MM-dd HH:mm:ss.SSS} %5p ${hostName} --- [%15.15t] %-40.40c{1.} : %m%n%ex
    </Property>
</Properties>
<Appenders>
    <Console name="ConsoleAppender" target="SYSTEM_OUT" follow="true">
        <PatternLayout pattern="${LOG_PATTERN}"/>
    </Console>
    <RollingFile name="FileAppender" fileName="${env:LEM_HOME}/Logs/LEM.log" 
                 filePattern="${env:LEM_HOME}/Logs/LEM-%d{yyyy-MM-dd}-%i.log">
        <PatternLayout>
            <Pattern>${LOG_PATTERN}</Pattern>
        </PatternLayout>
        <Policies>
            <SizeBasedTriggeringPolicy size="10MB" />
        </Policies>
        <DefaultRolloverStrategy max="10"/>
    </RollingFile>
</Appenders>
<Loggers>
    <Logger name="com.mdenis.labequipmentmanager" level="debug" additivity="false">
        <AppenderRef ref="ConsoleAppender" />
        <AppenderRef ref="FileAppender" />
    </Logger>
    <Logger name="org.apache.tomcat" level="debug" additivity="false">
        <AppenderRef ref="ConsoleAppender" />
        <AppenderRef ref="FileAppender" />
    </Logger>
    <Logger name="org.springframework" level="debug" additivity="false">
        <AppenderRef ref="ConsoleAppender" />
        <AppenderRef ref="FileAppender" />
    </Logger>
    <Logger name="org.hibernate" level="info" additivity="false">
        <AppenderRef ref="ConsoleAppender" />
        <AppenderRef ref="FileAppender" />
    </Logger>
    <Root level="error">
        <AppenderRef ref="ConsoleAppender"/>
    </Root>
</Loggers>
</Configuration>

我知道它可以工作，因为设置 Spring 调试的日志级别会在应用程序启动时为我提供大约一百万条日志条目。这是 POM.XML 文件供参考：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.mdenis</groupId>
<artifactId>LEM2</artifactId>
<version>1.0-SNAPSHOT</version>

<name>Lab Equipment Manager</name>

<properties>
    <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.4.RELEASE</version>
</parent>

<dependencies>

    <!--JAVA-->
    <dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
    </dependency>

    <!--TOMCAT-->
    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
    </dependency>

    <!--SPRING-->
    <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-jdbc</artifactId>
    </dependency>
    <!--<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>

    <!--MICROSOFT-->
    <dependency>
        <groupId>com.microsoft.sqlserver</groupId>
        <artifactId>mssql-jdbc</artifactId>
    </dependency>

    <!--HIBERNATE-->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>6.0.12.Final</version>
    </dependency>

    <!--LOMBOK-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>

    <!--JSTL-->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
    </dependency>

    <!--VMWARE-->
    <dependency>
        <groupId>com.vmware</groupId>
        <artifactId>vijava</artifactId>
        <version>5.1</version>
    </dependency>

    <!--LOG4J2-->
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-slf4j-impl</artifactId>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-api</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-1.2-api</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-jcl</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-web</artifactId>
    </dependency>

</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

</project>

我唯一不能做的就是将 Tomcat 设置为调试级别。通过这些设置，我也可以将 Hibernate 设置为 DEBUG 模式，因此我相信 Tomcat 有一些特定的东西。

有没有一种方法可以像使用其他框架一样使用 log4j2 来控制 Tomcat 嵌入式日志记录级别？

谢谢！

【问题讨论】：

标签： java log4j2 embedded-tomcat-8

【解决方案1】：

我进行了更多搜索并找到了如何执行此操作。您需要将此添加到您运行的 java -jar 命令中：

-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager

由于某种原因，无法像我对自己的记录器那样以编程方式更改日志记录级别，因此您必须将其放入 log4j2.xml 文件中：

    <Logger name="org.apache" level="debug" additivity="false">
        <AppenderRef ref="ConsoleAppenderWebClient" />
        <AppenderRef ref="FileAppenderWebClient" />
    </Logger>

【讨论】：