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通过扩展PatternLayout的方式

在集成自定义的格式的日志的过程中,一般会采用过滤器或者拦截器的方式来做。然而,对于此处讲解的将Spring Boot服务的AppName和Eureka的实例信息集成到日志系统中的时候,应用名和实例Id在程序启动过后一般不会变化的,如果每次都去走过滤器和拦截器的话,感觉有点多余。

源码参考:Github

思路

  • 在应用程序中添加对Spring Boot启动过程中ApplicationEnvironmentPreparedEvent事件的监听 ,随后将AppName和InstanceId放入一个静态变量中。
  • 继承PatternLayout之后,上面两个信息在日志输出过程中就会被填充上。

步骤:

1、创建自定义的格式转换器AppInfoConverter: 该类继承自ch.qos.logback.classic.pattern.ClassicConverter

/**
 * @author jian.tan
 */
public class AppInfoConverter extends ClassicConverter {
    public static String appName;
    public static String instanceId;

    @Override public String convert(ILoggingEvent event) {
        return "App_Name: " + appName + "," + " Instance_Id: " + instanceId;
    }
}

2、将转换器添加到自定义的PatternLayout中: 该类继承自ch.qos.logback.classic.PatternLayout:

import ch.qos.logback.classic.PatternLayout;

public class AppInfoPatternLayout extends PatternLayout {
    static {
        defaultConverterMap.put("app_info", AppInfoConverter.class.getName());
    }
}

3、添加对Spring Boot启动事件ApplicationEnvironmentPreparedEvent 的监听:

  • 继承org.springframework.context.ApplicationListener
import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.core.env.Environment;
import static com.example.webclientdemo.logback.AppInfoConverter.*;

public class ApplicationStartedEventListener implements ApplicationListener<ApplicationEnvironmentPreparedEvent> {

    @Override
    public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
        Environment environment = event.getEnvironment();
        appName = environment.getProperty("spring.application.name");
        instanceId = environment.getProperty("eureka.instance.instanceId");
    }
}
  • 按照SpringBoot官方文档在resources/META-INF下面添加如下描述文件:

spring.factories

org.springframework.context.ApplicationListener=com.example.webclientdemo.MyApplicationStartedEventListener

4、添加logback.xml配置文件 在resources/logback.xml下面添加如下内容:

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="60 seconds" debug="false">
    <!--输出到控制台-->
    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <!-- <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
             <level>ERROR</level>
         </filter>-->
        <layout class="io.daocloud.apollodemo.logback.AppInfoPatternLayout">
            <pattern>%d{HH:mm:ss.SSS} %contextName [%app_info] [%thread] %-5level %logger{36} -%msg%n</pattern>
        </layout>
    </appender>

    <!--输出到文件-->
    <appender name="file" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <!-- 日志路径 可以是绝对路径也可以是相对路径-->
        <file>logs/logback-producer.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 定义了日志的切分方式 -->
            <fileNamePattern>logs/crn/apollo.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <!-- 表示只保留最近30天的日志 -->
            <maxHistory>30</maxHistory>
            <!-- 用来指定日志文件的上限大小,例如设置为1GB的话,那么到了这个值,就会删除旧的日志。-->
            <totalSizeCap>1GB</totalSizeCap>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <!-- maxFileSize:这是活动文件的大小,默认值是10MB -->
                <maxFileSize>10MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} %contextName [%app_info] [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>
    <!-- 用来指定最基础的日志输出级别,只有一个level属性。 -->
    <root level="info">
        <appender-ref ref="console"/>
        <appender-ref ref="file"/>
    </root>
</configuration>

5、最后启动程序查看效果: 发现[App_Name: dmp-producer, Instance_Id: null]等字样,其中Instance_Id: null是demo中没有接入Eureka的缘故。

18:13:34.415 default [App_Name: dmp-producer, Instance_Id: null] [main] INFO  i.d.apollodemo.ProducerApplication -No active profile set, falling back to default profiles: default
18:13:35.166 default [App_Name: dmp-producer, Instance_Id: null] [main] WARN  c.c.f.f.i.p.DefaultApplicationProvider -app.id is not available from System Property and /META-INF/app.properties. It is set to null
18:13:35.178 default [App_Name: dmp-producer, Instance_Id: null] [main] INFO  c.c.f.f.i.p.DefaultServerProvider -Environment is set to null. Because it is not available in either (1) JVM system property 'env', (2) OS env variable 'ENV' nor (3) property 'env' from the properties InputStream.
18:13:35.331 default [App_Name: dmp-producer, Instance_Id: null] [main] INFO  o.s.cloud.context.scope.GenericScope -BeanFactory id=7342d45a-9f38-3e75-b931-411c5d464b8f