动态指定日志路径（logback)

实现日志上下文监听，添加路径变量

 package com.x.x.x.listener;
 
 import ch.qos.logback.classic.Level;
 import ch.qos.logback.classic.Logger;
 import ch.qos.logback.classic.LoggerContext;
 import ch.qos.logback.classic.spi.LoggerContextListener;
 import ch.qos.logback.core.Context;
 import ch.qos.logback.core.spi.ContextAwareBase;
 import ch.qos.logback.core.spi.LifeCycle;
 
 public class CustomLogContextListener extends ContextAwareBase implements LoggerContextListener, LifeCycle {
 
     /** 存储日志路径标识 */
     public static final String LOG_PAHT_KEY = "LOG_PATH";
 
     @Override
     public boolean isResetResistant() {
         return false;
     }
 
     @Override
     public void onStart(LoggerContext loggerContext) {
     }
     @Override
     public void onReset(LoggerContext loggerContext) {
     }
     @Override
     public void onStop(LoggerContext loggerContext) {
     }
     @Override
     public void onLevelChange(Logger logger, Level level) {
     }
 
     @Override
     public void start() {
         String s = System.getProperty("user.dir") + "/logs/";
         System.setProperty(LOG_PAHT_KEY, s);
         Context context = getContext();
         context.putProperty(LOG_PAHT_KEY,  s);
     }
     @Override
     public void stop() {
     }
     @Override
     public boolean isStarted() {
         return false;
     }
 }

在logbakc.xml文件中指定上下文监听类

在日志配置文件中引入“CustomLogContextListener”（<contextListener class="com.x.x.x.listener.CustomLogContextListener" />）类，

就可以直接通过声明的变量名称使用路径(${LOG_PATH}),LOG_PATH就是在CustomLogContextListener类中指定的变量名称

 <?xml version="1.0" encoding="UTF-8" ?>
 <configuration  scan="true" scanPeriod="20 seconds" debug="false">
     <contextListener class="com.x.x.x.listener.CustomLogContextListener" />
     <property name="PROJECT_NAME" value="xxxx" />
     <!-- 控制台输出日志 -->
     <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
         <layout class="ch.qos.logback.classic.PatternLayout">
             <pattern>%d{yyyy-MM-dd'T'HH:mm:ss.SSSXXX} ${PROJECT_NAME} [%thread] %-5level %logger{80}[%line]  %msg%n</pattern>
         </layout>
     </appender>
 
     <!-- 文件输出日志 (文件大小策略进行文件输出，超过指定大小对文件备份)-->
     <appender name="FILE-debug" class="ch.qos.logback.core.rolling.RollingFileAppender">
         <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
             <level>DEBUG</level>
         </filter>
         <File>${LOG_PATH}/${PROJECT_NAME}_debug.log</File>
         <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
             <FileNamePattern>${LOG_PATH}/${PROJECT_NAME}_debug.%i.log
             </FileNamePattern>
             <MinIndex>1</MinIndex>
             <MaxIndex>10</MaxIndex>
         </rollingPolicy>
         <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
             <MaxFileSize>10MB</MaxFileSize>
         </triggeringPolicy>
         <encoder>
             <pattern>%d{yyyy-MM-dd'T'HH:mm:ss.SSSXXX} ${PROJECT_NAME} [%thread] %-5level %logger{80}[%line]  %msg%n</pattern>
         </encoder>
     </appender>
 <root level="INFO">
         <appender-ref ref="STDOUT"/>
         <appender-ref ref="FILE-debug" />
         <appender-ref ref="FILE-error" />
     </root>
 </configuration>