把slf4j日志输出到控制台

版权声明：本文为博主原创文章，转载请说明出处。 https://blog.csdn.net/lijiaxiong_123/article/details/88653950

第一步，引入以下三个依赖文件

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>

第二步，在resource目录下创建logback.xml文件

logback.xml文件的详细配置参考资料：https://logback.qos.ch/manual/configuration.html

<?xml version="1.0" encoding="UTF-8"?>

<configuration>
    <!--设置日志输出到控制台-->
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <!-- encoder的默认实现类是ch.qos.logback.classic.encoder.PatternLayoutEncoder -->
        <encoder>
            <pattern>%date %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
        </encoder>
    </appender>
    <!-- name值可以是包名或具体的类名：该包（包括子包）下的类或该类将采用此logger -->
    <logger name="com.john.logging.b" level="INFO" additivity="false">
        <appender-ref ref="STDOUT" />
    </logger>

    <!--设置日志输出为文件-->
    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
        <file>logFile.log</file>
        <encoder>
            <pattern>%date %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
        </encoder>
    </appender>

    <root level="DEBUG">
        <appender-ref ref="STDOUT" />
        <appender-ref ref="FILE" />
    </root>
</configuration>

编写测试类

public class TestLog {

    private static Logger logger= LoggerFactory.getLogger(TestLog.class);

    public static void main(String[] args){
        logger.debug("this is debug log");
        logger.info("this is info log");
        logger.error("this is error log");
    }
}

输出结果