第一步：新建maven项目，添加依赖

<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>
	<groupId>com.example</groupId>
	<artifactId>logging-test</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<properties>
		<maven.compiler.source>8</maven.compiler.source>
		<maven.compiler.target>8</maven.compiler.target>
	</properties>

	<dependencies>
		<dependency>
			<artifactId>junit</artifactId>
			<groupId>junit</groupId>
			<version>4.12</version>
		</dependency>

		<!-- log4j日志实现 -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>

		<!-- -slf4j core 使用slf4j必须添加，这是slf4j日志门面，基本上为接口 -->
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.7.32</version>
		</dependency>

		<!-- slf4j转log4j桥接包 -->
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.27</version>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.8.1</version>
				<configuration>
					<source>${maven.compiler.source}</source>
					<target>${maven.compiler.target}</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

第二步：测试代码

package com.example.test;

import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TestSlf4j {

	private static final Logger LOGGER = LoggerFactory.getLogger(TestSlf4j.class);

	@Test
	public void testSlf4j() {
		// 打印日志信息
		LOGGER.error("error");
		LOGGER.warn("warn");
		LOGGER.info("info");
		LOGGER.debug("debug");
		LOGGER.trace("trace"); // 使用占位符输出日志信息
		String name = "lucy";
		Integer age = 18;
		LOGGER.info("{}今年{}岁了！", name, age); // 将系统异常信息写入日志
		try {
			int i = 1 / 0;
		} catch (Exception e) {
			// e.printStackTrace();
			LOGGER.info("出现异常：", e);
		}
	}

}