springboot日志配置：

springboot默認(rèn)日志是打印再console中的，不會(huì)保存在文件中。我們項(xiàng)目上線肯定要保存日志用于分析的。

一、使用xml配置日志保存（并不需要pom配置slf4j依賴，starter里面已經(jīng)配置了依賴了）

1、在項(xiàng)目的resources目錄下創(chuàng)建一個(gè)【logback-spring.xml】日志配置文件

名稱只要是一 logback開頭就行，測(cè)試使用log.xml并不會(huì)生成日志。合法名稱：logback.xml 、logback-spring.xml

備注：要配置logback-spring.xml，springboot會(huì)默認(rèn)加載此文件，為什么不配置logback.xml,因?yàn)?code style="font-size: 14px;padding: 2px 4px;border-radius: 4px;margin-right: 2px;margin-left: 2px;color: rgb(30, 107, 184);background-color: rgba(27, 31, 35, 0.05);font-family: "Operator Mono", Consolas, Monaco, Menlo, monospace;word-break: break-all;">logback.xml會(huì)先application.properties加載，而logback-spring.xml會(huì)后于application.properties加載，這樣我們?cè)?code style="font-size: 14px;padding: 2px 4px;border-radius: 4px;margin-right: 2px;margin-left: 2px;color: rgb(30, 107, 184);background-color: rgba(27, 31, 35, 0.05);font-family: "Operator Mono", Consolas, Monaco, Menlo, monospace;word-break: break-all;">application.properties文中設(shè)置日志文件名稱和文件路徑才能生效

2、編寫xml文件內(nèi)容：

<configuration??scan="true"?scanPeriod="60?seconds"?debug="false">
?<contextName>logbackcontextName>
?
?<appender?name="console"?class="ch.qos.logback.core.ConsoleAppender">
??<encoder>
???
???<pattern>%d{yyyy-MM-dd?HH:mm:ss.SSS}?[%thread]?%-5level?%logger?-?%msg%npattern>

??encoder>
?appender>

?
?<appender?name="logFile"??class="ch.qos.logback.core.rolling.RollingFileAppender">
????<Prudent>truePrudent>?
????<rollingPolicy?class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
??????<FileNamePattern>
?????poslog/%d{yyyy-MM-dd}/%d{yyyy-MM-dd}.log
??????FileNamePattern>
??????<maxHistory>7maxHistory>?
????rollingPolicy>
????<layout?class="ch.qos.logback.classic.PatternLayout">
??????<Pattern>
???????%d{yyyy-MM-dd?HH:mm:ss.SSS}?[%thread]?%-5level?%logger?-?%msg%n
??????Pattern>
????layout>
?appender>

?<root?level="INFO">
??<appender-ref?ref="console"?/>
??<appender-ref?ref="logFile"?/>
?root>

configuration>

上述配置的編碼中，對(duì)應(yīng)符號(hào)的含義如下

• %d{HH:mm:ss.SSS}——日志輸出時(shí)間
• %thread——輸出日志的進(jìn)程名字，這在Web應(yīng)用以及異步任務(wù)處理中很有用
• %-5level——日志級(jí)別，并且使用5個(gè)字符靠左對(duì)齊
• %logger ——日志輸出者的名字
• %msg——日志消息
• %n——平臺(tái)的換行符

3、編寫打印日志

?private?Logger?logger?=?LoggerFactory.getLogger(TestController.class);
?
?logger.info("name?=?"?+?name?+?"?||?views?=?"?+?views);//?使用

4、啟動(dòng)測(cè)試

在當(dāng)前文件夾下會(huì)創(chuàng)建一個(gè)【poslog/2020-10/22】的文件夾，里面會(huì)按天生成日志：【2020-10-22.log】，例如：

2020-10-22?16:38?[main]?INFO??org.springframework.boot.web.embedded.tomcat.TomcatWebServer?-?Tomcat?initialized?with?port(s):?8088?(http)
2020-10-22?16:38?[main]?INFO??org.apache.coyote.http11.Http11NioProtocol?-?Initializing?ProtocolHandler?["http-nio-8088"]
2020-10-22?16:38?[main]?INFO??org.apache.catalina.core.StandardService?-?Starting?service?[Tomcat]
2020-10-22?16:38?[main]?INFO??org.apache.catalina.core.StandardEngine?-?Starting?Servlet?engine:?[Apache?Tomcat/9.0.38]
2020-10-22?16:38?[main]?INFO??org.apache.catalina.core.AprLifecycleListener?-?Loaded?Apache?Tomcat?Native?library?[1.2.23]?using?APR?version?[1.7.0].
2020-10-22?16:38?[main]?INFO??org.apache.catalina.core.AprLifecycleListener?-?APR?capabilities:?IPv6?[true],?sendfile?[true],?accept?filters?[false],?random?[true].
2020-10-22?16:38?[main]?INFO??org.apache.catalina.core.AprLifecycleListener?-?APR/OpenSSL?configuration:?useAprConnector?[false],?useOpenSSL?[true]
2020-10-22?16:38?[main]?INFO??org.apache.catalina.core.AprLifecycleListener?-?OpenSSL?successfully?initialized?[OpenSSL?1.1.1c??28?May?2019]
2020-10-22?16:38?[main]?INFO??org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/]?-?Initializing?Spring?embedded?WebApplicationContext
2020-10-22?16:38?[main]?INFO??org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext?-?Root?WebApplicationContext:?initialization?completed?in?1422?ms
2020-10-22?16:38?[main]?INFO??org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor?-?Initializing?ExecutorService?'applicationTaskExecutor'
2020-10-22?16:38?[main]?INFO??org.apache.coyote.http11.Http11NioProtocol?-?Starting?ProtocolHandler?["http-nio-8088"]
2020-10-22?16:38?[main]?INFO??org.springframework.boot.web.embedded.tomcat.TomcatWebServer?-?Tomcat?started?on?port(s):?8088?(http)?with?context?path?''
2020-10-22?16:38?[main]?INFO??com.example.demo.DockerComposeTestApplication?-?Started?DockerComposeTestApplication?in?2.841?seconds?(JVM?running?for?3.257)

備注：發(fā)現(xiàn)使用這個(gè)默認(rèn)不用配置pom依賴，最新的spring-boot-starter-web中已經(jīng)集成了。

總結(jié)：啟動(dòng)一個(gè)項(xiàng)目，直接將logback-spring.xml文件復(fù)制到resources目錄下就可以實(shí)現(xiàn)日志文件記錄。非常方便。

二、進(jìn)階配置：

分類logback.xml配置：

日志配置到d盤了

<configuration>
?
?<property?name="log.path"?value="d:/logback"?/>
?
?<property?name="log.pattern"?value="%d{HH:mm:ss.SSS}?[%thread]?%-5level?%logger{20}?-?[%method,%line]?-?%msg%n"?/>

?
?<appender?name="console"?class="ch.qos.logback.core.ConsoleAppender">
??<encoder>
???<pattern>${log.pattern}pattern>
??encoder>
?appender>
?
?
?<appender?name="file_info"?class="ch.qos.logback.core.rolling.RollingFileAppender">
??<file>${log.path}/sys-info.logfile>
??
??<rollingPolicy?class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
???
???<fileNamePattern>${log.path}/sys-info.%d{yyyy-MM-dd}.logfileNamePattern>
???
???<maxHistory>60maxHistory>
??rollingPolicy>
??<encoder>
???<pattern>${log.pattern}pattern>
??encoder>
??<filter?class="ch.qos.logback.classic.filter.LevelFilter">
???

???
???<onMatch>ACCEPTonMatch>
???
???<onMismatch>DENYonMismatch>
??filter>
?appender>
?
?<appender?name="file_error"?class="ch.qos.logback.core.rolling.RollingFileAppender">
??<file>${log.path}/sys-error.logfile>
??
??<rollingPolicy?class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
???
???<fileNamePattern>${log.path}/sys-error.%d{yyyy-MM-dd}.logfileNamePattern>
???
???<maxHistory>60maxHistory>
??rollingPolicy>
??<encoder>
???<pattern>${log.pattern}pattern>
??encoder>
??<filter?class="ch.qos.logback.classic.filter.LevelFilter">
???
???<level>ERRORlevel>
???
???<onMatch>ACCEPTonMatch>
???
???<onMismatch>DENYonMismatch>
??filter>
?appender>
?
?
?<appender?name="sys-user"?class="ch.qos.logback.core.rolling.RollingFileAppender">
??<file>${log.path}/sys-user.logfile>
??<rollingPolicy?class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
???
???<fileNamePattern>${log.path}/sys-user.%d{yyyy-MM-dd}.logfileNamePattern>
???
???<maxHistory>60maxHistory>
??rollingPolicy>
??<encoder>
???<pattern>${log.pattern}pattern>
??encoder>
?appender>
?
?
?<logger?name="com.example"?level="debug"?/>
?
?<logger?name="org.springframework"?level="warn"?/>

?<root?level="info">
??<appender-ref?ref="console"?/>
?root>
?
?
?<root?level="info">
??<appender-ref?ref="file_info"?/>
??<appender-ref?ref="file_error"?/>
?root>
?
?
?<logger?name="sys-user"?level="info">
??<appender-ref?ref="sys-user"/>
?logger>
configuration>?

還可以在application.yml中配置

#?日志配置
logging:
??level:
????com.example:?info
????org.springframework:?warn

配置info就只有info以上日志才會(huì)輸出

如果配置 com.example: debug ，那么我們項(xiàng)目com.example包里面debug以上的日志也會(huì)輸出。

-?END -
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