스프링 프레임워크(Spring Framework)-로그(Logger) 사용법

개발 환경

java 21.0.4 2024-07-16 LTSJava(TM) SE Runtime Environment (build 21.0.4+8-LTS-274)

Java HotSpot(TM) 64-Bit Server VM (build 21.0.4+8-LTS-274, mixed mode, sharing)

 

Tomcatv 10.1

EclipseVersion: 2024-06 (4.32.0)Build id: 20240606-1231

---

pom.xml

<!--Slf4j dependencies -->
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>2.0.9</version>
</dependency>
<!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-classic -->
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>1.4.11</version>
</dependency>

---

logback.xml

src/main/resources 폴더를 생성한 후 해당 파일을 생성합니다.

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

    <!-- Console 출력 -->
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss} %-5level [%thread] %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- 파일 출력 -->
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>/Users/jangjeonghun/logs/application.log</file>  <!-- 로그 파일 위치 -->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>logs/app-%d{yyyy-MM-dd}.log</fileNamePattern> <!-- 로그 파일 롤링 패턴 -->
            <maxHistory>30</maxHistory> <!-- 로그 보관 기간 -->
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss} %-5level [%thread] %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- Log 레벨 및 출력 대상 설정 -->
    <root level="debug">
        <appender-ref ref="CONSOLE" />
        <appender-ref ref="FILE" />
    </root>

</configuration>

---

*.java

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

private final Logger log = LoggerFactory.getLogger(getClass());
log.trace("tract log");
log.debug("debug log");
log.info("info log={}","sdfsdfdsfsdfs");
log.warn("warn log={}","");
log.error("error log={}","sdfsdfsfsd");