log4j2 动态生成logger，每个logger一个输出文件

本文主要是介绍log4j2 动态生成logger，每个logger一个输出文件，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

maven依赖

<dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>2.7</version>
</dependency>

java实现

package log4j2;import java.io.File;
import java.io.IOException;import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.appender.RollingFileAppender;
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.SizeBasedTriggeringPolicy;
import org.apache.logging.log4j.core.appender.rolling.TimeBasedTriggeringPolicy;
import org.apache.logging.log4j.core.appender.rolling.TriggeringPolicy;
import org.apache.logging.log4j.core.appender.rolling.action.Action;
import org.apache.logging.log4j.core.appender.rolling.action.DeleteAction;
import org.apache.logging.log4j.core.appender.rolling.action.Duration;
import org.apache.logging.log4j.core.appender.rolling.action.IfFileName;
import org.apache.logging.log4j.core.appender.rolling.action.IfLastModified;
import org.apache.logging.log4j.core.appender.rolling.action.PathCondition;
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.apache.logging.log4j.core.layout.PatternLayout;/*** 动态创建日志* @author：涂有* @date 2017年4月19日 下午6:03:41*/
public class LogUtil {/**日志打印的目录*/private static final String datalogDir = "log";private static final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);private static final Configuration config = ctx.getConfiguration();private LogUtil(){}/**启动一个动态的logger*/@SuppressWarnings({ "rawtypes", "unchecked" })private static void start(String loggerName) {		//创建一个展示的样式：PatternLayout，   还有其他的日志打印样式。Layout layout = PatternLayout.newBuilder().withConfiguration(config).withPattern("%msg%n").build();//单个日志文件大小TimeBasedTriggeringPolicy tbtp = TimeBasedTriggeringPolicy.createPolicy(null, null);TriggeringPolicy tp = SizeBasedTriggeringPolicy.createPolicy("10M");CompositeTriggeringPolicy policyComposite = CompositeTriggeringPolicy.createPolicy(tbtp, tp);String loggerDir = datalogDir + File.separator + loggerName;//删除日志的条件IfFileName ifFileName = IfFileName.createNameCondition(null, loggerName + "\\.\\d{4}-\\d{2}-\\d{2}.*");IfLastModified ifLastModified = IfLastModified.createAgeCondition(Duration.parse("1d"));DeleteAction deleteAction = DeleteAction.createDeleteAction(loggerDir, false, 1, false, null,new PathCondition[]{ifLastModified,ifFileName}, null, config);Action[] actions = new Action[]{deleteAction};DefaultRolloverStrategy strategy = DefaultRolloverStrategy.createStrategy("7", "1", null, null, actions, false, config);String loggerPathPrefix = loggerDir + File.separator + loggerName;RollingFileAppender appender = RollingFileAppender.newBuilder().withFileName(loggerPathPrefix + ".log").withFilePattern(loggerPathPrefix + ".%d{yyyy-MM-dd}.%i.log").withAppend(true).withStrategy(strategy).withName(loggerName).withPolicy(policyComposite).withLayout(layout).withConfiguration(config).build();appender.start();config.addAppender(appender);AppenderRef ref = AppenderRef.createAppenderRef(loggerName, null, null);AppenderRef[] refs = new AppenderRef[]{ref};LoggerConfig loggerConfig = LoggerConfig.createLogger(false,Level.ALL, loggerName, "true", refs, null, config, null);loggerConfig.addAppender(appender, null, null);config.addLogger(loggerName, loggerConfig);ctx.updateLoggers();}/**使用完之后记得调用此方法关闭动态创建的logger，避免内存不够用或者文件打开太多*/public static void stop(String loggerName) {synchronized (config){config.getAppender(loggerName).stop();config.getLoggerConfig(loggerName).removeAppender(loggerName);config.removeLogger(loggerName);ctx.updateLoggers();}}/**获取Logger*/public static Logger getLogger(String loggerName) {synchronized (config) {if (!config.getLoggers().containsKey(loggerName)) {start(loggerName);}}return LogManager.getLogger(loggerName);}public static void main(String[] args) throws IOException, InterruptedException {for(int i = 0; i < 10000; i++){String name = "s" + String.valueOf(i);Logger logger = getLogger(name);logger.info("asdfasdf");stop(name);}}
}

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在这里插入图片描述