动态创建Logger

示例依赖log4j2.xml,需要预先在里面创建一个配置模版

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?><configuration status="WARN" shutdownHook="disable">    <Properties>        <Property name="sysName">schedule</Property>        <Property name="bizLogLevel">@env.log4j2.biz.level@</Property>        <Property name="otherLogLevel">@env.log4j2.other.level@</Property>        <Property name="logFilePath">@env.log4j2.log.path@</Property>        <Property name="logSize">@env.log4j2.log.size@</Property>        <Property name="maxFile">100</Property>        <Property name="errorLogFile">${sysName}_err</Property>        <Property name="allLogFile">${sysName}_all</Property>    </Properties>    <appenders>        <Console name="Console" target="SYSTEM_OUT">            <ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/>            <PatternLayout charset="UTF-8" pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%t] [%c:%line] - %msg%n"/>        </Console>        <RollingFile name="TaskCfgRollingFile" fileName="${logFilePath}/task-log-factory.log"                     filePattern="${logFilePath}/$${date:yyyy-MM}/${errorLogFile}-%d{MM-dd-yyyy}-%i.log.gz">            <PatternLayout charset="UTF-8" pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%t] [%c:%line] - %msg%n"/>            <Filters>                <ThresholdFilter level="${bizLogLevel}"/>                <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL"/>            </Filters>            <Policies>                <TimeBasedTriggeringPolicy/>                <SizeBasedTriggeringPolicy size="${logSize}"/>            </Policies>        </RollingFile>        <RollingFile name="AllRollingFile" fileName="${logFilePath}/${allLogFile}.log"                     filePattern="${logFilePath}/$${date:yyyy-MM}/${allLogFile}-%d{MM-dd-yyyy}-%i.log.gz">            <PatternLayout charset="UTF-8" pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%t] [%c:%line] - %msg%n"/>            <Policies>                <TimeBasedTriggeringPolicy/>                <SizeBasedTriggeringPolicy size="${logSize}"/>            </Policies>        </RollingFile>    </appenders>    <loggers>        <logger name="TaskCfgLogger" level="${bizLogLevel}" additivity="false">            <appender-ref ref="TaskCfgRollingFile"/>            <appender-ref ref="Console"/>        </logger>        <root level="${otherLogLevel}">            <appender-ref ref="AllRollingFile"/>            <appender-ref ref="Console"/>        </root>    </loggers></configuration>

package org.ideap.schedule.log;/** * Created by xiongpu on 2017/7/3. */public class AbyLogConfig {    /**     * log4j2.xml 里面定义的logger name 用来作为配置模板,目前支持 RollingFileAppender,ConsoleAppender,FileAppender     */    private String cfgLogName;    /**     * 定义的logger 名称     */    private String name;    /**     * fileName="${logFilePath}/task-log-factory.log" 要替换的内容 比如这里task-log-factory替换为任务名称     */    private String fileNameKey;    /**     * 替换值 如任务名     */    private String fileName;    // 省略get set}

package org.ideap.schedule.log;import org.apache.logging.log4j.Level;import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;import org.apache.logging.log4j.core.Appender;import org.apache.logging.log4j.core.LoggerContext;import org.apache.logging.log4j.core.appender.ConsoleAppender;import org.apache.logging.log4j.core.appender.FileAppender;import org.apache.logging.log4j.core.appender.RollingFileAppender;import org.apache.logging.log4j.core.config.AppenderRef;import org.apache.logging.log4j.core.config.Configuration;import org.apache.logging.log4j.core.config.LoggerConfig;import org.springframework.util.CollectionUtils;import java.util.ArrayList;import java.util.List;import java.util.Map;/** * Created by xiongpu on 2017/7/3. */public class AbyLogFactory {    private static AbyLogFactory abyLogFactory = new AbyLogFactory();    private AbyLogFactory() {    }    public static AbyLogFactory getAbyLogFactory() {        return abyLogFactory;    }    public void start(AbyLogConfig abyLogConfig) {        //为false时，返回多个LoggerContext对象， true：返回唯一的单例LoggerContext        final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);        final Configuration config = ctx.getConfiguration();        org.apache.logging.log4j.core.Logger cfgLogger = (org.apache.logging.log4j.core.Logger) LogManager.getLogger(abyLogConfig.getCfgLogName());        if (cfgLogger == null) {            LogManager.getLogger(AbyLogFactory.class).error("not found {} logger (please define in log4j2.xml)", abyLogConfig.getCfgLogName());            return;        }        Map<String, Appender> appenderMap = cfgLogger.getAppenders();        List<AppenderRef> appenderRefs = new ArrayList<>();        List<Appender> appenders = new ArrayList<>();        appenderMap.forEach((key, appenderCfg) -> {            Appender appender = getAppender(abyLogConfig, config, appenderCfg);            if (appender != null) {                appender.start();                config.addAppender(appender);                AppenderRef ref = AppenderRef.createAppenderRef(appender.getName(), null, null);                appenderRefs.add(ref);                appenders.add(appender);            }        });        if (CollectionUtils.isEmpty(appenders)) return;        AppenderRef[] refs = new AppenderRef[appenderRefs.size()];        refs = appenderRefs.toArray(refs);        LoggerConfig loggerConfig = LoggerConfig.createLogger(false, Level.ALL, abyLogConfig.getName(),                "true", refs, null, config, null);        appenders.stream().forEach(e ->                loggerConfig.addAppender(e, Level.ALL, null)        );        config.addLogger(abyLogConfig.getName(), loggerConfig);        ctx.updateLoggers(config);    }    private Appender getAppender(AbyLogConfig abyLogConfig, Configuration config, Appender appenderCfg) {        Appender appender = null;        if (appenderCfg instanceof RollingFileAppender) {            RollingFileAppender rollingFileAppender = (RollingFileAppender) appenderCfg;            appender = RollingFileAppender.newBuilder()                    .withConfiguration(config)                    .withName(abyLogConfig.getName() + "RollingFile")                    .withFileName(rollingFileAppender.getFileName().replaceAll(abyLogConfig.getFileNameKey(), abyLogConfig.getFileName()))                    .withFilePattern(rollingFileAppender.getFilePattern())                    .withLayout(rollingFileAppender.getLayout())                    .withFilter(rollingFileAppender.getFilter())                    .withPolicy(rollingFileAppender.getTriggeringPolicy())                    .build();        } else if (appenderCfg instanceof ConsoleAppender) {            ConsoleAppender consoleAppender = (ConsoleAppender) appenderCfg;            appender = ConsoleAppender.newBuilder()                    .withName(abyLogConfig.getName() + "Console")                    .withLayout(consoleAppender.getLayout())                    .build();        } else if (appenderCfg instanceof FileAppender) {            FileAppender fileAppender = (FileAppender) appenderCfg;            appender = FileAppender.newBuilder()                    .withConfiguration(config)                    .withName(abyLogConfig.getName() + "File")                    .withFileName(fileAppender.getFileName().replaceAll(abyLogConfig.getFileNameKey(), abyLogConfig.getFileName()))                    .withLayout(fileAppender.getLayout())                    .withFilter(fileAppender.getFilter())                    .build();        } else {            LogManager.getLogger(AbyLogFactory.class).warn("unsupported appender type ,appender type not in(RollingFileAppender,ConsoleAppender,FileAppender)", appenderCfg.getClass());        }        return appender;    }    /**     * 获取Logger     *     * @param abyLogConfig     * @return     */    public Logger createLogger(AbyLogConfig abyLogConfig) {        if (!LogManager.exists(abyLogConfig.getName())) {            start(abyLogConfig);        }        return LogManager.getLogger(abyLogConfig.getName());    }}

测试

package org.ideap.schedule;import org.apache.logging.log4j.Logger;import org.ideap.schedule.log.AbyLogConfig;import org.ideap.schedule.log.AbyLogFactory;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;@RunWith(SpringRunner.class)@SpringBootTestpublic class AbyScheduleServerApplicationTests {   @Test   public void contextLoads() {      AbyLogConfig abyLogConfig=new AbyLogConfig();      abyLogConfig.setName("test1");      abyLogConfig.setCfgLogName("TaskCfgLogger");      abyLogConfig.setFileNameKey("task-log-factory");      abyLogConfig.setFileName(abyLogConfig.getName());      Logger logger= AbyLogFactory.getAbyLogFactory().createLogger(abyLogConfig);      logger.info("------------创建成功--------------");      logger.error("------------创建成功--------------");   }}

测试结果

参考：https://www.feehi.com/view/4346

有问题欢迎指正~