详解Spring Boot下使用logback 记录多个文件日志

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  # 下面这一行的意思是使用application.yml中的global.log-dir变量
  <springProperty scope="context" name="LOG_DIR" source="global.log-dir" defaultValue="./log/"/>
  <!-- 追加器开始 -->
  # 这个是一个可以定义变量的Appender
  <appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender">
    # 使用 LoggerNameBasedDiscriminator 这个类根据当前Logger获取变量
    <discriminator class="com.utils.loggers.LoggerNameBasedDiscriminator">
      <defaultValue>general</defaultValue>
    </discriminator>
    <sift>
      # 根据变量loggerName名字生成根据日期滚动的Appender
      <appender name="FILE-${loggerName}" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>
          ${LOG_DIR}/${loggerName}.log
        </file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
          <fileNamePattern>
            ${LOG_DIR}/${loggerName}.%d{yyyy-MM-dd}.log.gz
          </fileNamePattern>
          <maxHistory>15</maxHistory>
        </rollingPolicy>

        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
          <level>INFO</level>
        </filter>

        <encoder>
          <pattern>%d{HH:mm:ss.SSS} %-5level - %msg%n
          </pattern>
        </encoder>
      </appender>

      <appender name="FILE-ERROR-${loggerName}" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_DIR}/${loggerName}.err.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
          <fileNamePattern>
            ${LOG_DIR}/${loggerName}.%d{yyyy-MM-dd}.err.log.gz
          </fileNamePattern>
          <maxHistory>15</maxHistory>
        </rollingPolicy>

        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
          <level>ERROR</level>
        </filter>

        <encoder>
          <pattern>%d{HH:mm:ss.SSS} %-5level - %msg%n
          </pattern>
        </encoder>
      </appender>
    </sift>
  </appender>
  <!-- 追加器结束 -->

  <!-- 日志开始 -->
  <logger name="com.some.service" level="INFO" additivity="false">
    <appender-ref ref="SIFT"/>
  </logger>
  <!-- 日志结束 -->

</configuration>

package com.utils.loggers;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.sift.AbstractDiscriminator;

public class LoggerNameBasedDiscriminator extends AbstractDiscriminator<ILoggingEvent> {
  private static final String KEY = "loggerName";
  private String defaultValue;

  public String getDefaultValue() {
    return defaultValue;
  }

  public void setDefaultValue(String defaultValue) {
    this.defaultValue = defaultValue;
  }
  # 这就是之所以xml里面可以引用loggerName变量的原因
  public String getKey() {
    return KEY;
  }

  public void setKey() {
    throw new UnsupportedOperationException("Key not settable. Using " + KEY);
  }

  public String getDiscriminatingValue(ILoggingEvent e) {
    String loggerName = e.getLoggerName();

    if (loggerName == null)
      return defaultValue;
    else {
      String[] split = loggerName.split("\\.");
      return split[split.length - 1];
    }
  }
}

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <springProperty scope="context" name="LOG_DIR" source="global.log-dir" defaultValue="./log/"/>

  <!-- 追加器开始 -->
  <appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender">
    <discriminator class="com.utils.loggers.LoggerNameBasedDiscriminator">
    </discriminator>
    <sift>
      <appender name="FILE-${loggerName}"
           class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_DIR}/${loggerName}.log</file>
        <rollingPolicy
            class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
          <fileNamePattern>
            ${LOG_DIR}/${loggerName}.%d{yyyy-MM-dd}.log
          </fileNamePattern>
          <maxHistory>15</maxHistory>
        </rollingPolicy>

        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
          <level>INFO</level>
        </filter>

        <encoder>
          <pattern>%d{HH:mm:ss.SSS} %-5level - %msg%n
          </pattern>
        </encoder>
      </appender>
    </sift>
  </appender>
  <appender name="SIFT-ERR" class="ch.qos.logback.classic.sift.SiftingAppender">
    <discriminator class="com.infervision.utils.loggers.LoggerNameBasedDiscriminator">
    </discriminator>
    <sift>
      <appender name="FILE-ERROR-${loggerName}" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_DIR}/${loggerName}.err.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
          <fileNamePattern>
            ${LOG_DIR}/${loggerName}.%d{yyyy-MM-dd}.err.log
          </fileNamePattern>
          <maxHistory>15</maxHistory>
          <totalSizeCap>50MB</totalSizeCap>
        </rollingPolicy>

        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
          <level>ERROR</level>
        </filter>

        <encoder>
          <pattern>%d{HH:mm:ss.SSS} %-5level - %msg%n
          </pattern>
        </encoder>
      </appender>
    </sift>
  </appender>

  <!-- 异步输出 -->
  <appender name ="ASYNC" class= "ch.qos.logback.classic.AsyncAppender">
    <!-- 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>
    <!-- 添加附加的appender,最多只能添加一个 -->
    <appender-ref ref ="SIFT"/>
  </appender>

  <!-- 异步输出 -->
  <appender name ="ASYNC-ERR" class= "ch.qos.logback.classic.AsyncAppender">
    <!-- 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>
    <!-- 添加附加的appender,最多只能添加一个 -->
    <appender-ref ref ="SIFT-ERR"/>
  </appender>
  <!-- 追加器结束 -->

  <!-- 日志开始 -->

  <logger name="com.some.service" level="INFO" additivity="false">
    <appender-ref ref="ASYNC"/>
  </logger>
  <!-- 日志结束 -->

</configuration>