Slf4j + Logback 配置及BUG 解决-02（KILL_BUG）

背景：
2021年底日志系统发生了史诗级核弹，Log4j出现了严重bug漏洞，攻击者可以通过远程修改log4j日志，添加自己所需要的内容入侵到系统代码，严重影响到了系统安全，顺其自然将日志修改配置改为 Slf4j + Logback, 并且logback是Spring官方推荐使用的日志，在操作和性能上拥有极大的提升。

使用配置
springboot 默认使用了log4j ，修改pom文件，排除log4j

<dependency>
   <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
        </exclusion>
    </exclusions>
</dependency>

关键代码：

application.yml 中指定添加logback.xml文件路径

#slf4j日志配置
logging:
  config: classpath:logback.xml

在resource目录下新建logback.xml文件，并添加以下内容

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="10 seconds">
    <contextName>Logback For Test</contextName>
    <!-- name的值是变量的名称，value的值时变量定义的值。通过定义的值会被插入到logger上下文中。定义变量后，可以使“${}”来使用变量。 -->
    <!-- 定义日志文件 输入位置 -->
    <property name="logDir" value="/opt/logback/Test" />
    <!-- 日志最大的历史 存储一周 -->
    <property name="maxHistory" value="7" />

    <!-- 控制台输出日志 -->
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger-%msg%n</pattern>
            <charset class="java.nio.charset.Charset">UTF-8</charset>
        </encoder>
    </appender>

    <!-- ERROR级别日志 -->
    <appender name="ERROR"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy
                class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${logDir}\%d{yyyyMMdd}\error.log</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger -
                %msg%n</pattern>
            <charset class="java.nio.charset.Charset">UTF-8</charset>
        </encoder>
        <append>false</append>
        <prudent>false</prudent>
    </appender>

    <!-- WARN级别日志 -->
    <appender name="WARN"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>WARN</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy
                class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${logDir}\%d{yyyyMMdd}\warn.log</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger-%msg%n</pattern>
            <charset class="java.nio.charset.Charset">UTF-8</charset>
        </encoder>
        <append>false</append>
        <prudent>false</prudent>
    </appender>

    <!-- INFO级别日志 -->
    <appender name="INFO"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy
                class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${logDir}\%d{yyyyMMdd}\info.log</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger-%msg%n</pattern>
            <charset class="java.nio.charset.Charset">UTF-8</charset>
        </encoder>
        <append>false</append>
        <prudent>false</prudent>
    </appender>

    <!-- DEBUG级别日志 -->
    <appender name="DEBUG"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>DEBUG</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy
                class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${logDir}\%d{yyyyMMdd}\debug.log</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger-%msg%n</pattern>
            <charset class="java.nio.charset.Charset">UTF-8</charset>
        </encoder>
        <append>false</append>
        <prudent>false</prudent>
    </appender>

    <!--文件日志， 按照每天生成日志文件 -->
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!--日志文件输出的文件名-->
            <FileNamePattern>${logDir}/%d{yyyyMMdd}/boss.%d{yyyy-MM-dd}.log</FileNamePattern>
            <!--日志文件保留天数-->
            <MaxHistory>7</MaxHistory>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符-->
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
        <!--日志文件最大的大小-->
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <MaxFileSize>20MB</MaxFileSize>
        </triggeringPolicy>
    </appender>

    <!-- 异步输出 -->
    <appender name="dayLogAsyncAppender" class="ch.qos.logback.classic.AsyncAppender">
        <includeCallerData>true</includeCallerData>
        <!-- 不丢失日志.默认的,如果队列的80%已满,则会丢弃TRACT、DEBUG、INFO级别的日志 -->
        <discardingThreshold>0</discardingThreshold>
        <!-- 更改默认的队列的深度,该值会影响性能.默认值为256 -->
        <queueSize>512</queueSize>
        <appender-ref ref="FILE"/>
    </appender>

    <!--专为 spring 定制-->
    <logger name="org.springframework" level="info"/>
    <!--myibatis log configure-->
    <!--
    <logger name="com.apache.ibatis" level="TRACE"/>
    <logger name="java.sql.Connection" level="DEBUG"/>
    <logger name="java.sql.Statement" level="DEBUG"/>
    <logger name="java.sql.PreparedStatement" level="DEBUG"/>
     -->
    <!-- root级别 DEBUG -->
    <root level="INFO">
        <!-- 控制台输出 -->
        <appender-ref ref="STDOUT" />
        <!-- 文件输出 -->
        <appender-ref ref="ERROR" />
        <appender-ref ref="INFO" />
        <appender-ref ref="WARN" />
        <appender-ref ref="DEBUG" />
    </root>
</configuration>

BUG问题
报错内容

Logging system failed to initialize using configuration from 'classpath:logback.xml'
java.lang.IllegalStateException: Logback configuration error detected: 
ERROR in ch.qos.logback.classic.AsyncAppender[dayLogAsyncAppender] - No attached appenders found.
ERROR in ch.qos.logback.classic.AsyncAppender[dayLogAsyncAppender] - No attached appenders found.
	at org.springframework.boot.logging.logback.LogbackLoggingSystem.loadConfiguration(LogbackLoggingSystem.java:169)
	at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSpecificConfig(AbstractLoggingSystem.java:66)
	at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:57)
	at org.springframework.boot.logging.logback.LogbackLoggingSystem.initialize(LogbackLoggingSystem.java:118)
	at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:310)
	at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:281)
	at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:239)
	at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:216)

解决办法：

代码：

 <!--文件日志， 按照每天生成日志文件 -->
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!--日志文件输出的文件名-->
            <FileNamePattern>${logDir}/%d{yyyyMMdd}/boss.%d{yyyy-MM-dd}.log</FileNamePattern>
            <!--日志文件保留天数-->
            <MaxHistory>7</MaxHistory>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符-->
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
        <!--日志文件最大的大小-->
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <MaxFileSize>20MB</MaxFileSize>
        </triggeringPolicy>
    </appender>

在logback.xml 中添加以上内容，bug解决。

注意： 以上bug解决办法都由本人亲自测试过，若有问题，请留言。