11、Logback日誌框架介紹和SpringBoot整合實戰 2節課
1、新日誌框架LogBack介紹
簡介：日誌介紹和新日誌框架Logback講解
1.常用處理java的日誌元件 slf4j,log4j,logback,common-logging 等
2、logback介紹：基於Log4j基礎上大量改良，不能單獨使用，推薦配合日誌框架SLF4J來使用
logback當前分成三個模組：logback-core,logback-classic和logback-access;
logback-core是其它兩個模組的基礎模組
3、Logback的核心物件：
Logger：日誌記錄器
Appender：指定日誌輸出的目的地，目的地可以是控制檯，檔案
Layout：日誌佈局 格式化日誌資訊的輸出
4、日誌級別：DEBUG < INFO < WARN < ERROR
===========log4j示例===========
### 設定###
log4j.rootLogger = debug,stdout,D,E
### 輸出資訊到控制擡 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
### 輸出DEBUG 級別以上的日誌到=D://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = D://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
### 輸出ERROR 級別以上的日誌到=D://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =E://logs/error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
===========logback============
4、Log4j日誌轉換為logback線上工具（支援log4j.properties轉換為logback.xml,不支援 log4j.xml轉換為logback.xml）
https://logback.qos.ch/translator/
2、SpringBoot2.x日誌講解和自定義Logback配置實戰
簡介：講解SpringBoot2.x整合Logback配置實戰
日誌節選：
26.1 Log Format
The default log output from Spring Boot resembles the following example:
2014-03-05 10:57:51.112 INFO 45469 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/7.0.52 2014-03-05 10:57:51.253 INFO 45469 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2014-03-05 10:57:51.253 INFO 45469 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1358 ms 2014-03-05 10:57:51.698 INFO 45469 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/] 2014-03-05 10:57:51.702 INFO 45469 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
The following items are output:
- Date and Time: Millisecond precision and easily sortable.
- Log Level:
ERROR,WARN,INFO,DEBUG, orTRACE. - Process ID.
- A
---separator to distinguish the start of actual log messages. - Thread name: Enclosed in square brackets (may be truncated for console output).
- Logger name: This is usually the source class name (often abbreviated).
- The log message.
各個元件案例：https://logback.qos.ch/manual/index.html
2、分析SpringBoot啟動日誌
1）預設情況下，Spring Boot將日誌輸出到控制檯
3、整合Logback實戰
1）建立 日誌檔案logback-spring.xml，官方推薦 -spring.xml結尾
預設載入載入配置順序 logback-spring.xml, logback-spring.groovy, logback.xml, or logback.groovy
註釋：
<configuration> 子節點
<appender></appender>
<logger></logger>
<root></root>(要加在最後)
配置檔案程式碼：
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <configuration> 3 4 <appender name="consoleApp" class="ch.qos.logback.core.ConsoleAppender"> 5 <layout class="ch.qos.logback.classic.PatternLayout"> 6 <pattern> 7 %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n 8 </pattern> 9 </layout> 10 </appender> 11 12 <appender name="fileInfoApp" class="ch.qos.logback.core.rolling.RollingFileAppender"> 13 <filter class="ch.qos.logback.classic.filter.LevelFilter"> 14 <level>ERROR</level> 15 <onMatch>DENY</onMatch> 16 <onMismatch>ACCEPT</onMismatch> 17 </filter> 18 <encoder> 19 <pattern> 20 %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n 21 </pattern> 22 </encoder> 23 <!-- 滾動策略 --> 24 <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> 25 <!-- 路徑 --> 26 <fileNamePattern>app_log/log/app.info.%d.log</fileNamePattern> 27 </rollingPolicy> 28 </appender> 29 30 <appender name="fileErrorApp" 31 class="ch.qos.logback.core.rolling.RollingFileAppender"> 32 <filter class="ch.qos.logback.classic.filter.ThresholdFilter"> 33 <level>ERROR</level> 34 </filter> 35 <encoder> 36 <pattern> 37 %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n 38 </pattern> 39 </encoder> 40 41 <!-- 設定滾動策略 --> 42 <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> 43 <!-- 路徑 --> 44 <fileNamePattern>app_log/log/app.err.%d.log</fileNamePattern> 45 46 <!-- 控制保留的歸檔檔案的最大數量，超出數量就刪除舊檔案，假設設定每個月滾動， 且<maxHistory> 是1，則只儲存最近1個月的檔案，刪除之前的舊檔案 --> 47 <MaxHistory>1</MaxHistory> 48 49 </rollingPolicy> 50 </appender> 51 52 <!-- 控制總的輸出級別 --> 53 <root level="INFO"> 54 <appender-ref ref="consoleApp" /> 55 <appender-ref ref="fileInfoApp" /> 56 <appender-ref ref="fileErrorApp" /> 57 </root> 58 </configuration>
設定完成後會自動建立資料夾
