Log4j 2 환경설정 (설정 파일 사용 시)

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

 <!-- Appender, Layout 설정 -->
 <Appenders>
  <Console name="console" target="SYSTEM_OUT">
   <PatternLayout/>
  </Console>
  <File name="file" fileName="./logs/file/sample.log" append="false">
   <PatternLayout pattern="%d %5p [%c] %m%n"/>
  </File>
 </Appenders>

 <!-- Logger 설정 -->
 <Loggers>
  <Logger name="egovLogger" level="DEBUG" additivity="false">
   <AppenderRef ref="console"/>
   <AppenderRef ref="file"/>
  </Logger>
  <Rootlevel="ERROR">
   <AppenderRef ref="console"/>
  </Root>
 </Loggers>

</Configuration>

 <Loggers>
  <Logger>...</Logger>
  <Root>...</Root>
 </Loggers>

 <Loggers>
  <!-- attribute: name(Logger명), level(Log Level), additivity(중복로깅여부, true or false) -->
  <!-- element: AppenderRef(Appender명) -->
  <Logger name="X.Y" level="INFO" additivity="false">
   <AppenderRef ref="console"/>  
  </Logger>
  <Logger name="X" level="DEBUG" additivity="false">
   <AppenderRef ref="console"/>  
  </Logger>
  <Rootlevel="ERROR">
   <AppenderRef ref="console"/>
  </Root>
 </Loggers>

  package egovframe.sample;

  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;

  public class LoggerTest {

   // (1) Logger Name이 "egovframe.sample.LoggerTest"인 Logger 설정을 따르는 Logger 객체 생성
   Logger logger1 = LogManager.getLogger();     
   // (2) 위와 동일             
   Logger logger2 = LogManager.getLogger(LoggerTest.class);  
   // (3) Logger Name이 "X"인 Logger설정을 따르는 Logger 객체 생성
   Logger logger3 = LogManager.getLogger("X");   

  }

 package egovframe.sample;

 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;

 public class LoggerTest {
  Logger logger = LogManager.getLogger(); // Root Logger 설정을 따름, Log Level: ERROR
  org.apache.logging.log4j.core.Logger targetLogger = (org.apache.logging.log4j.core.Logger) logger;

  targetLogger.debug("변경 전 - debug"); // 출력됨
  targetLogger.error("변경 전 - error"); // 출력 안됨


  targetLogger.setLevel(Level.DEBUG); // DEBUG, INFO, WARN, ERROR, FATAL 출력 가능
  targetLogger.debug("변경 후 - debug"); // 출력됨
  targetLogger.error("변경 후 - error"); // 출력됨	
}

 <Appenders>
  <Console>...</Console>
  <File>...</File>
  <RollingFile>...</RollingFile>
  <JDBC>...</JDBC>
 </Appenders>

 <Appenders>
   <Console name="console" target="SYSTEM_OUT">
    <PatternLayout /> <!-- 디폴트 패턴 적용, %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n -->
  </Console>
 </Appenders>
 <Loggers>
  <Logger name="egovLogger" level="DEBUG" additivity="false">
   <AppenderRef ref="console" />
  </Logger>
  <Rootlevel="ERROR">
   <AppenderRef ref="console" />
  </Root>
 </Loggers>

 <!-- attribute: name(Appender명), target(출력방향지정, "SYSTEM_OUT" or "SYSTEM_ERR"(default)), follow, ignoreExceptions -->
 <!-- element: Layout(출력패턴설정), Filters -->
 <Console name="console" target="SYSTEM_OUT">
  <PatternLayout pattern="%d %5p [%c] %m%n" />
 </Console>

 <!-- attribute: name(Appender명), fileName(target파일명), append(이어쓰기여부, true(default) or false), locking, immediateFlush, ignoreExceptions, bufferedIO -->
 <!-- element: Layout(출력패턴설정), Filters -->
 <!-- append="false"이면 매번 로깅 시 기존 로그 파일을 clear하고 새로 로깅 -->
 <File name="file" fileName="./logs/file/sample.log" append="false">
  <PatternLayout pattern="%d %5p [%c] %m%n" />
 </File>	
 <File name="mdcFile" fileName="./logs/file/mdcSample.log" append="false">
  <!-- Thread Context Map(also known as MDC) 객체의 key와 매칭되는 value를 로깅 - %X{key} -->
  <!-- ex) ThreadContext.put(“testKey”, “testValue”);인 경우, 레이아웃 패턴 %X{testKey}에 의해 “testValue” 로깅 -->
  <PatternLayout pattern="%d %5p [%c] [%X{class} %X{method} %X{testKey}] %m%n" />
 </File>

 <!-- attribute: name(Appender명), fileName(target파일명), filePattern(history파일명), append, immediateFlush, ignoreExceptions, bufferedIO -->
 <!-- element: Layout(출력패턴설정), Filters, Policy(file rolling 조건 설정), Strategy(file name과 location 관련 설정) -->
 <RollingFile name="rollingFile" fileName="./logs/rolling/rollingSample.log" filePattern="./logs/rolling/rollingSample.%i.log">
  <PatternLayout pattern="%d %5p [%c] %m%n" />
  <Policies>
   <!-- size 단위: Byte(default), KB, MB, or GB -->
   <SizeBasedTriggeringPolicy size="1000" />
  </Policies>
  <!-- 기존 maxIndex 속성이 Strategy 엘리먼트로 변경됨 -->
  <!-- index는 min(default 1)부터 max(default 7)까지 증가, 아래에는 max="3"으로 settting -->
  <!-- fileIndex="min"이므로 target file의 size가 1000 byte를 넘어가면, fileIndex가 1(min)인 history file에 백업 (fixed window strategy) -->
  <!-- 그 다음 1000 byte를 넘어가면, rollingSample.1.log을 rollingSample.2.log 파일에 복사하고, target 파일을 rollingSample.1.log에복사한 후 target 파일에 새로 로깅 -->
  <DefaultRolloverStrategy max="3" fileIndex="min" />
 </RollingFile>

 <RollingFile name="rollingFile" fileName="./logs/rolling/dailyRollingSample.log" filePattern="./logs/daily/dailyRollingSample.log.%d{yyyy-MM-dd-HH-mm-ss}">
  <PatternLayout pattern="%d %5p [%c] %m%n" />
  <Policies>
   <!-- interval(default 1)이므로 1초 간격으로 rolling 수행 --> 
   <TimeBasedTriggeringPolicy />
  </Policies>
 </RollingFile>

 <!-- attribute: name(Appender명), tableName(RDB Table명), columnConfigs, filter, bufferSize, ignoreExceptions, connectionSource -->
 <!-- element: DataSource(jndi datasource 정보), ConnectionFactory(Connection Factory 정보), Column(Table Column명) -->
 <!-- 테이블명이 db_log인 테이블에 로깅됨 -->
 <JDBC name="db" tableName="db_log">
  <!-- DB Connection을 제공해줄 클래스와 메서드명 정의 -->
  <!-- JDBCAppender가 EgovConnectionFactory.getDatabaseConnection() 메서드를 호출 -->
  <ConnectionFactory class="egovframework.rte.fdl.logging.db.EgovConnectionFactory" method="getDatabaseConnection" />
   <!-- log event가 insert될 컬럼 설정, insert될 값은 PatternLayout의 pattern 사용 -->
   <Column name="eventDate" isEventTimestamp="true" />
   <Column name="level" pattern="%p" />
   <Column name="logger" pattern="%c" />
   <Column name="message" pattern="%m" />
   <Column name="exception" pattern="%ex{full}" />
 </JDBC>

 <bean id="egovConnectionFactory" class="egovframework.rte.fdl.logging.db.EgovConnectionFactory">
  <property name="dataSource" ref="dataSource" />
 </bean>

 <Console>
  <!-- 디폴트 패턴 적용, "%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n" -->
  <PatternLayout/>
 </Console>