java - 如何让 log4j2 使用 Spring Boot 和 Maven 创建不同的日志文件

Question

我是初学者，在 Spring Boot 应用程序中设置 log4j2 时遇到问题。我已经尝试自己做大约一周了，阅读了很多提示、帖子和教程，但仍然没有找到解决方案。有人可以帮我吗？我想为不同的日志级别创建不同的文件，例如 error.log、warn.log 等。

pom.xml

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.assessment.ww</groupId>
    <artifactId>Assessment_Exercise</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Assessment_Exercise</name>
    <description>Spring Boot Project</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</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-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{yyyy-MMM-dd HH:mm:ss} [%t] %-5level %logger{36} - %msg%n"/>
        </Console>

        <File name="File" target="logs/app.log">
            <PatternLayout pattern="%d{yyyy-MMM-dd HH:mm:ss} [%t] %-5level %logger{36} - %msg%n"/>
        </File>
    </Appenders>

    <Loggers>
<!--        Log everything -->
        <Logger name="com.assessment.ww.Assessment_Exercise" level="debug" additivity="false">
            <AppenderRef ref="Console"/>
            <AppenderRef ref="File"/>
        </Logger>

<!--        Log everything in Spring Boot -->
        <Logger name="org.springframework.boot" level="debug" additivity="false">
            <AppenderRef ref="Console"/>
            <AppenderRef ref="File"/>
        </Logger>

<!--        Log everything in Spring Core -->
        <Logger name="org.springframework.core" level="debug" additivity="false">
            <AppenderRef ref="Console"/>
            <AppenderRef ref="File"/>
        </Logger>

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

开始上课

package com.assessment.ww.Assessment_Exercise;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class AssessmentExerciseApplication {

    private static final Logger logger = LogManager.getLogger(AssessmentExerciseApplication.class);

    public static void main(String[] args) {

        SpringApplication.run(AssessmentExerciseApplication.class, args);

        logger.info("Starting SB app");
    }
}

我也有这样的警告 - 也许它会有所帮助: enter image description here

它打印我的 logger.info 消息(但为什么不格式化？)但不创建任何文件。 enter image description here

预先感谢您的任何建议。

Answer 1

终于，我找到了解决办法。问题是 Logback - 即使我在 pom.xml 中的 spring-boot-starter-web 依赖项中禁用了它，它在 spring-boot-starter-data-jpa 和 spring-boot-starter-actuator 中仍然处于 Activity 状态。所以现在我的 pom.xml 看起来像这样:

...
<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</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-data-jpa</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-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
...