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java log相关:Log4J、Log4J2、LogBack，SLF4J

news 2025/9/6 5:54:33

测试

maven依赖

   <dependencies><!-- SLF4J API --><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>2.0.13</version> <!-- 推荐使用最新稳定版 --></dependency><!-- Logback Classic (包含 logback-core) --><dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>1.4.14</version> <!-- 与 slf4j-api 兼容 --></dependency><!-- logback-core 是 logback-classic 的依赖，无需单独声明 --><dependency><groupId>ch.qos.logback</groupId><artifactId>logback-core</artifactId><version>1.4.14</version></dependency><!-- Log4j 2 API --><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-api</artifactId><version>2.23.1</version></dependency><!-- Log4j 2 Core 实现 --><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>2.23.1</version></dependency><!-- 如果你使用 SLF4J 门面，需要桥接 --><!-- 将 SLF4J 调用桥接到 Log4j 2 --><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-slf4j2-impl</artifactId><version>2.23.1</version></dependency></dependencies>

logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration><!-- 控制台输出 --><appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"><encoder><pattern>%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n</pattern></encoder></appender><!-- 按天滚动的日志文件 --><appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"><file>//Users/dwl/projects/maven-test/logs/app.log</file><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><fileNamePattern>logs/app.%d{yyyy-MM-dd}.log</fileNamePattern><maxHistory>30</maxHistory></rollingPolicy><encoder><pattern>%d{yyyy-MM-dd HH:mm:ss} %-5level %logger{36} - %msg%n</pattern></encoder></appender><!-- 日志级别控制 --><root level="INFO"><appender-ref ref="STDOUT"/><appender-ref ref="FILE"/></root>
</configuration>

测试主程序


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;public class Main {private static final Logger logger = LoggerFactory.getLogger(Main.class);public static void main(String[] args) {logger.info("应用启动中...");logger.warn("这是一个警告");logger.error("这是一个错误");}
}

或者使用lombok

import lombok.extern.slf4j.Slf4j;@Slf4j
public class Main {public static void main(String[] args) {log.info("应用启动中...");log.warn("这是一个警告");log.error("这是一个错误");}
}