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动态替换logback FileAppender/RollingFileAppender 配置- Programmatically configure logback FileAppender/Rol
作者:互联网
一、本文实际解决的问题
如何在代码中修改logback的RollingFileAppender配置(本文代码实例为修改日志文件路径)
二、针对的场景:
本文解决的问题属于一个大需求的一部分,需求为:需要特殊处理的请求的相关日志,需要与正常日志分开打印;同时不能去推动全公司应用修改代码,这样成本过高,尽量通过引入二方包解决问题
本文主要介绍获取Logger之后如何修改Logger配置,实现日志输出到别的路径
三、logback logger结构简述
四、实现流程
1、获取Logger
private static Logger logger = LoggerFactory.getLogger(TaskHistoryService.class);
2、获取所有Appender
// 获取从logger到RootLogger的所有appenders
public static ArrayList<Appender> getAppendersTraversal(Logger logger){
Logger parent = logger;
ArrayList<Appender> result = new ArrayList<>();
while(parent != null){
ArrayList<Appender> tempResult = getAppenders(parent);
if (tempResult != null){
result.addAll(tempResult);
}
parent = getParent(parent);
}
return result;
}
// 获取logger中的appenders
public static ArrayList<Appender> getAppenders(Logger logger){
AppenderAttachableImpl<ILoggingEvent> aai;
ArrayList<Appender> fileAppenders = new ArrayList<>();
try {
Class<?> clazz = ch.qos.logback.classic.Logger.class;
Field aaiField = clazz.getDeclaredField("aai");
aaiField.setAccessible(true);
AppenderAttachableImpl<ILoggingEvent> markedAai;
aai = (AppenderAttachableImpl<ILoggingEvent>)aaiField.get(logger);
if (aai == null){
return null;
}
Iterator<Appender<ILoggingEvent>> aaiIterator = aai.iteratorForAppenders();
while (aaiIterator.hasNext()){
Appender<ch.qos.logback.classic.spi.ILoggingEvent> appender = aaiIterator.next();
fileAppenders.add(appender);
}
return fileAppenders;
} catch (NoSuchFieldException e){
e.printStackTrace();
return fileAppenders;
} catch (IllegalAccessException e){
e.printStackTrace();
return fileAppenders;
}
}
// 获取logger的parent logger
public static Logger getParent(Logger logger) {
Class<?> clazz = ch.qos.logback.classic.Logger.class;
try {
Field parentField = clazz.getDeclaredField("parent");
parentField.setAccessible(true);
Logger parent = (Logger)parentField.get(logger);
return parent;
} catch (NoSuchFieldException e){
e.printStackTrace();
return null;
} catch (IllegalAccessException e){
e.printStackTrace();
return null;
}
}
3、获取RollingFileAppender
public static RollingFileAppender getRollingFileAppender(Appender appender){
if (appender instanceof RollingFileAppender){
return (RollingFileAppender)appender;
}
return null;
}
4、更新Policy
private static RollingFileAppender updateRollingPolicyToMark(RollingFileAppender rollingFileAppender, String newFile, String newPattern){
RollingPolicy rollingPolicy = rollingFileAppender.getRollingPolicy();
TriggeringPolicy triggeringPolicy = rollingFileAppender.getTriggeringPolicy();
RollingPolicyBase rollingPolicyBase = (RollingPolicyBase)rollingPolicy;
rollingPolicyBase.setFileNamePattern(newPattern);
// stop all:appender + policy
stopRollingFileAppender(rollingFileAppender);
// set fileName
setFileName(rollingFileAppender, newFile);
// start
startRollingFileAppender(rollingFileAppender);
return rollingFileAppender;
}
private static void stopRollingFileAppender(RollingFileAppender rollingFileAppender){
rollingFileAppender.stop();
}
private static void startRollingFileAppender(RollingFileAppender rollingFileAppender){
rollingFileAppender.getTriggeringPolicy().start();
rollingFileAppender.getRollingPolicy().start();
rollingFileAppender.start();
}
private static void setFileName(RollingFileAppender rollingFileAppender, String fileName){
RollingPolicy rollingPolicy = rollingFileAppender.getRollingPolicy();
TriggeringPolicy triggeringPolicy = rollingFileAppender.getTriggeringPolicy();
// remove policy
rollingFileAppender.setRollingPolicy(null);
rollingFileAppender.setTriggeringPolicy(null);
// set fileName
rollingFileAppender.setFile(fileName);
// set policy
rollingFileAppender.setRollingPolicy(rollingPolicy);
rollingFileAppender.setTriggeringPolicy(triggeringPolicy);
}
标签:RollingBackAppender,RollingFileAppender,return,rollingFileAppender,static,Logger 来源: https://www.cnblogs.com/blaketairan/p/10890520.html