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[备忘]log4j2动态创建Logger

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添加日期:2024/2/19 16:34:07 快速返回   返回列表 阅读83次


import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender;
import org.apache.logging.log4j.core.config.*;
import org.apache.logging.log4j.core.layout.PatternLayout;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.appender.rolling.CompositeTriggeringPolicy;
import org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy;
import org.apache.logging.log4j.core.appender.rolling.OnStartupTriggeringPolicy;
import org.apache.logging.log4j.core.appender.rolling.SizeBasedTriggeringPolicy;
import org.apache.logging.log4j.core.appender.rolling.TimeBasedTriggeringPolicy;

private static Logger getRollingFileAppender(String logName) {
        //日志路径
        String logPath = System.getProperty("webapp.root") + "/../data/log";

        try {
            //获取当前配置
            LoggerContext loggerContext = (LoggerContext) LogManager.getContext(false);
            Configuration configuration = loggerContext.getConfiguration();

            // 创建RollingFileAppender
            AbstractAppender.Builder appender2 = RollingRandomAccessFileAppender.newBuilder()
                    .withFileName(logPath + "/" + logName + ".log")
                    .withFilePattern(logPath + "/" + logName + "-%d{yyyy-MM-dd}.log")
                    .withAppend(true)
                    .withPolicy(createTriggeringPolicy())
                    .withStrategy(DefaultRolloverStrategy.newBuilder().withFileIndex("max").withConfig(configuration).build())
                    .withImmediateFlush(false)
                    .withLayout(PatternLayout.newBuilder().withPattern("[%d{yyyy-MM-dd HH:mm:ss}][%p][%c][%x][%m]%n").build())
                    .withName(logName);

            //启动appender
            RollingRandomAccessFileAppender appender = ((RollingRandomAccessFileAppender.Builder) appender2).build();
            appender.start();
            configuration.addAppender(appender);

            //创建Logger
            AppenderRef ref = AppenderRef.createAppenderRef(logName + "Appender", null, null);
            LoggerConfig loggerConfig = LoggerConfig.createLogger(false, org.apache.logging.log4j.Level.INFO, logName, "false", new AppenderRef[]{ref}, null, configuration, null);
            loggerConfig.addAppender(appender, null, null);
            configuration.addLogger(logName, loggerConfig);

            //更新配置
            loggerContext.updateLoggers(configuration);

            //返回Logger
            return LoggerFactory.getLogger(logName);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 日志策略.
     *
     * @return
     */
    private static CompositeTriggeringPolicy createTriggeringPolicy() {
        TimeBasedTriggeringPolicy timeBasedTriggeringPolicy = TimeBasedTriggeringPolicy.newBuilder()
                .withInterval(10)
                .withModulate(true)
                .build();
        OnStartupTriggeringPolicy onStartupTriggeringPolicy = OnStartupTriggeringPolicy.createPolicy(1);
        SizeBasedTriggeringPolicy sizeBasedTriggeringPolicy = SizeBasedTriggeringPolicy.createPolicy("100MB");

        return CompositeTriggeringPolicy.createPolicy(sizeBasedTriggeringPolicy, timeBasedTriggeringPolicy, onStartupTriggeringPolicy);
    }

 

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