05.门面Slf4j+log4j2

1.导入pom依赖

<!--使用slf4j作为日志的门面,使用log4j2来记录日志 -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.25</version>
</dependency>
<!--为slf4j绑定日志实现 log4j2的适配器 -->
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-slf4j-impl</artifactId>
    <version>2.10.0</version>
</dependency>

<!-- Log4j2 门面API-->
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>2.11.1</version>
</dependency> <!-- Log4j2 日志实现 -->
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.11.1</version>
</dependency>

2.默认使用log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="debug" monitorInterval="5">

    <properties>
        <property name="LOG_HOME">./logs</property>
    </properties>
    <Appenders>
        <Console name="Console" target="SYSTEM_ERR">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] [%-5level] %c{36}:%L --- %m%n" />
        </Console>
    </Appenders>
    <Loggers>
        <Root level="trace">
            <AppenderRef ref="Console" />
        </Root>
    </Loggers>
</Configuration>

3.使用

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Test {
    private final static Logger log = LoggerFactory.getLogger(Test.class);
    public static void main(String[] args) {
        log.info("ddddd");
    }
}