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>