解決log4j2警告：WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream

初識log4j2和log4j

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

public class Log4j2Test {
    public static void main(String[] args) {
        System.setProperty("log4j.skipJansi", "true");//2020-02-13 13:41:25,889 main WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
//        Logger logger = LogManager.getLogger(LogManager.ROOT_LOGGER_NAME);
        Logger logger = LogManager.getLogger("mylog");
        logger.trace("trace level");
        logger.debug("debug level");
        logger.info("info level");
        logger.warn("warn level");
        logger.error("error level");
        logger.fatal("fatal level");
    }
}

關於代碼第一行所報警告的解決方案的詳細描述，見：https://segmentfault.com/a/1190000002573352

若此工程下（建議resources目錄）沒有log4j2.xml文件，則報錯以及運行結果爲

ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
14:12:28.891 [main] ERROR mylog - error level
14:12:28.894 [main] FATAL mylog - fatal level

當在resources目錄下添加log4j2.xml，內容爲

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
    <properties>
        <property name="LOG_HOME">E:/logs</property>
        <property name="FILE_NAME">mylog</property>
        <property name="log.sql.level">info</property>
    </properties>


    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %l - %msg%n" />
        </Console>

        <RollingRandomAccessFile name="RollingRandomAccessFile" fileName="${LOG_HOME}/${FILE_NAME}.log" filePattern="${LOG_HOME}/$${date:yyyy-MM}/${FILE_NAME}-%d{yyyy-MM-dd HH-mm}-%i.log">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %l - %msg%n"/>
            <Policies>
                <TimeBasedTriggeringPolicy interval="1"/>
                <SizeBasedTriggeringPolicy size="10 MB"/>
            </Policies>
            <DefaultRolloverStrategy max="20"/>
        </RollingRandomAccessFile>
    </Appenders>

    <Loggers>
        <Root level="warn">
            <AppenderRef ref="Console" />
            <AppenderRef ref="RollingRandomAccessFile" />
        </Root>

        <Logger name="com.dy.hbase2hbase" level="${log.sql.level}" additivity="false">
            <AppenderRef ref="Console" />
        </Logger>
        <Logger name="mylog" level="${log.sql.level}" additivity="false">
            <AppenderRef ref="Console" />
        </Logger>
    </Loggers>
</Configuration>

位置結構如圖

針對上圖的報錯，只需在resources目錄下添加log4j.properties文件，其內容爲

log4j.rootLogger=info, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/spring.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n
#1.應用於控制檯 
#log4j.appender.CONSOLE = org.apache.log4j.ConsoleAppender 
#log4j.appender.Threshold = DEBUG 
#log4j.appender.CONSOLE.Target = System.out 
#log4j.appender.CONSOLE.layout = org.apache.log4j.PatternLayout 
#log4j.appender.CONSOLE.layout.ConversionPattern = [framework] % d - % c -%- 4r [ % t] %- 5p % c % x - % m % n 

##log4j.appender.CONSOLE.layout.ConversionPattern = [start] % d {DATE} [DATE] % n % p[PRIORITY] % n % x[NDC] % n % t[THREAD] n % c[CATEGORY] % n % m[MESSAGE] % n % n 

# 2.應用於文件 
#log4j.appender.FILE = org.apache.log4j.FileAppender 
#log4j.appender.FILE.File = file.log 
#log4j.appender.FILE.Append = false 
#log4j.appender.FILE.layout = org.apache.log4j.PatternLayout 
#log4j.appender.FILE.layout.ConversionPattern = [framework] % d - % c -%- 4r [ % t] %- 5p % c % x - % m % n 

# Use this layout for LogFactor 5 analysis 

# 3.應用於文件 
#log4j.appender.FILE = org.apache.log4j.FileAppender 
#log4j.appender.FILE.File = file.log 
#log4j.appender.FILE.Append = false 
#log4j.appender.FILE.layout = org.apache.log4j.PatternLayout 
#log4j.appender.FILE.layout.ConversionPattern = [framework] % d - % c -%- 4r [ % t] %- 5p % c % x - % m % n 

# Use this layout for LogFactor 5 analysis

而該工程所需要的pom.xml爲

        <!-- slf4j + log4j begin -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.10</version>
        </dependency>

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <!-- log4j end-->