SpringBoot使用logback自定义配置时遇到的坑

##问题描述 SpringBoot项目使用logback自定义配置后，会在/tmp/ 目录下生成 spring.log的文件(如下图所示)。

##解决方案 通过各种资料的搜索，最终发现问题的所在(logback配置如下)。

1<?xml version="1.0" encoding="UTF-8"?>    
2<configuration scan="true">    
3  <include resource="org/springframework/boot/logging/logback/base.xml"/>    
4
5  <springProperty scope="context" name="springAppName" source="spring.application.name"/>    
6  <property name="LOG_FILE" value="logs/${springAppName}"/>​    
7
8  <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">    
9    <layout class="ch.qos.logback.classic.PatternLayout">    
10      <pattern>    
11        %black(%d{ISO8601}) %highlight(%-5level) [%blue(%t)] %yellow(%C{1.}): %msg%n%throwable    
12      </pattern>    
13    </layout>    
14  </appender>    
15  <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">    
16    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">    
17      <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.log</fileNamePattern>    
18      <maxHistory>90</maxHistory>    
19      <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">    
20        <maxFileSize>200MB</maxFileSize>    
21      </timeBasedFileNamingAndTriggeringPolicy>    
22    </rollingPolicy>    
23    <encoder>    
24      <charset>utf-8</charset>    
25      <pattern>%d %-5level [%thread] %logger{0}: %msg%n</pattern>    
26    </encoder>    
27  </appender>    
28  <appender name="ASYNC" class="ch.qos.logback.classic.AsyncAppender">    
29    <queueSize>512</queueSize>    
30    <appender-ref ref="FILE"/>    
31  </appender>    
32  <root level="DEBUG">    
33    <appender-ref ref="CONSOLE"/>    
34    <appender-ref ref="ASYNC"/>    
35  </root>    
36
37  <!-- https://logback.qos.ch/manual/configuration.html#shutdownHook and https://jira.qos.ch/browse/LOGBACK-1090 -->    
38  <shutdownHook class="ch.qos.logback.core.hook.DelayingShutdownHook"/>    
39
40  <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator">    
41    <resetJUL>true</resetJUL>    
42  </contextListener>    
43
44</configuration>

###通过分析上面配置发现base.xml中包含了以下内容:

1<?xml version="1.0" encoding="UTF-8"?>
2 
3<!--
4Base logback configuration provided for compatibility with Spring Boot 1.1
5-->
6 
7<included>
8	<include resource="org/springframework/boot/logging/logback/defaults.xml" />
9	<property name="LOG_FILE" value="${LOG_FILE:-${LOG_PATH:-${LOG_TEMP:-${java.io.tmpdir:-/tmp}}/}spring.log}"/>
10	<include resource="org/springframework/boot/logging/logback/console-appender.xml" />
11	<include resource="org/springframework/boot/logging/logback/file-appender.xml" />
12	<root level="INFO">
13		<appender-ref ref="CONSOLE" />
14		<appender-ref ref="FILE" />
15	</root>
16</included>

从base.xml中可以看出来，会在/tmp/目录下默认生成一个spring.log，问题已经发现了，那就说明这里的配置需要更改，改成什么呢？ 通过在github上查询，只需要将

<include resource="org/springframework/boot/logging/logback/base.xml"/>

替换成

<include resource="org/springframework/boot/logging/logback/defaults.xml" />

即可。

问题解决。