Spring Boot 不加载 log4j2.xml

Question

我正在尝试在我的 spring 启动应用程序中添加 log4j2 框架，并且我正在使用 spring AOP 将日志记录问题与我的逻辑业务隔离开来。 不幸的是，当我尝试记录我的消息时，log4j2 不起作用，而是使用 spring 默认日志记录。

这是我尝试记录消息的 Logging 方面类：LoggingAspect.java

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
import org.springframework.util.StopWatch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Aspect
@Component
public class LoggingAspect {
    @Around("com.obs.dqsc.api.config.AspectConfig.businessService() || com.obs.dqsc.api.config.AspectConfig.repositoryOperations()")
    public Object logMethod(final ProceedingJoinPoint joinPoint)
            throws Throwable {
        final Class<?> targetClass = joinPoint.getTarget().getClass();
        final Logger logger = LoggerFactory.getLogger(targetClass);

        try {
            final String className = targetClass.getSimpleName();
            logger.debug(getPreMessage(joinPoint, className));

            final StopWatch stopWatch = new StopWatch();
            stopWatch.start();

            final Object retVal = joinPoint.proceed();
            stopWatch.stop();

            logger.debug(getPostMessage(joinPoint, className, stopWatch.getTotalTimeMillis()));

            return retVal;
        } catch (final Throwable ex) {
            logger.error(getErrorMessage(ex), ex);
            throw ex;
        }
    }

    private static String getPreMessage(final JoinPoint joinPoint, final String className) {
        final StringBuilder builder = new StringBuilder()
                .append("Entered in ").append(className).append(".")
                .append(joinPoint.getSignature().getName())
                .append("(");
        appendTo(builder, joinPoint);
        return builder
                .append(")")
                .toString();
    }

    private static String getPostMessage(final JoinPoint joinPoint, final String className, final long millis) {
        return "Exit from " + className + "." +
                joinPoint.getSignature().getName() +
                "(..); Execution time: " +
                millis +
                " ms;";
    }

    private static String getErrorMessage(final Throwable ex) {
        return ex.getMessage();
    }

    private static void appendTo(final StringBuilder builder, final JoinPoint joinPoint) {
        final Object[] args = joinPoint.getArgs();
        for (int i = 0; i < args.length; i++) {
            if (i != 0) {
                builder.append(", ");
            }
            builder.append(args[i]);
        }
    }

}

这是我的 pom.xml 文件：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.obs.dqsc</groupId>
    <artifactId>dqsc-api</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>api</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>16</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>5.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>5.0.0</version>
        </dependency>

    </dependencies>

    <build>
        <finalName>api-0.0.1-SNAPSHOT</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${project.parent.version}</version>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

最后这是我的 log4j2.xml 文件：

<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{yyyy-MMM-dd HH:mm:ss} [%t] %-5level %-50c{1.} - %msg%n" />
        </Console>
    </Appenders>

    <Loggers>
        <Root level="debug">
            <AppenderRef ref="Console" />
        </Root>
    </Loggers>
</Configuration>

而且，当我尝试使用 logger.info() 而不是 logger.debug() 时，它会在控制台中打印一些内容，但使用 .debug() 则不会！ （该消息显然是使用 spring 默认日志记录打印的）

我的 application.properties 不包含任何与 log4j 相关的内容，而且我的 log4j2.xml 也在 src/main/resources 中

Answer 1

以这种方式排除 spring boot 默认日志记录：

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

并像您一样添加 spring boot log4j2 依赖项，您会没事的。 因为您仅在 Web 模块上排除了日志记录模块，它仍然会被其他依赖项（例如数据 mongodb 模块）拉入。