Spring Boot Introduction (iii)-Log management

Spring Boot supports jul,log4j2 and logback.
1. Default Settings
-With SLF4J + Logback
-Log output to console only
-Level is info
-Log file rotate size is 10Mb
-Output format: Timestamp level process ID---[Thread name] class name log content

Reference: 2018-01-22 18:54:16.076 INFO 8296---[main] s.b.c.e.t.tomcatembeddedservletcontainer:tomcat started on Port (s): 8080 (http)

2. Input to File

Reference: Logging.path=d:

The Spring.log file is created in this directory and the output is the same as the console.

3. Detailed configuration

Src/main/resources/application.properties

1 # Location of the log file.2logging.file=d:\\spring-boot-Demo.log3 # Appender Pattern4Logging.pattern.console=%date%-5level%logger{0}-%msg%N5Logging.pattern.file=%date%-5level [%thread]%logger{0} [%file:%line]-%msg%N6logging.pattern.level=%5p7# Log Levels-Root8logging.level.=DEBUG9# Log Levels- PackageTenlogging.level.org.springframework.web=INFO One# Log Levels-class ALogging.level.com.rensanning.springboot.homecontroller=trace

Note: Logging.file and Logging.path cannot be set simultaneously

4. Test Code
Src/main/java/com/rensanning/springboot/hellocontroller.java

1 ImportOrg.slf4j.Logger;2 Importorg.slf4j.LoggerFactory;3 Importorg.springframework.web.bind.annotation.RequestMapping;4 ImportOrg.springframework.web.bind.annotation.RestController;5 6 @RestController7  Public classHellocontroller {8     9     Private FinalLogger log = Loggerfactory.getlogger ( This. GetClass ());Ten      One@RequestMapping ("/") A      PublicString Index () { -          -         //Log a simple message theLog.debug ("Debug Level Log"); -Log.info ("Info level log"); -Log.warn ("Warn level log"); -Log.error ("Error level Log"); +          -         return"Hello World from Spring boot!"; +     } A      at}

Access http://localhost:8080/After you start the app.

5. External configuration
src/main/resources/

• Logback, Logback.xml or Logback-spring.xml
• Log4j2, Log4j2.xml or Log4j2-spring.xml
• Logging.properties, JUL

Src/main/resources/logback-spring.xml

1<?xml version= "1.0" encoding= "UTF-8"?>2<configuration scan= "true" scanperiod= "seconds" >3 4<property name= "Log.base" value= "D:"/>5<property name= "Log.level" value= "DEBUG"/>6 7<!--appenders--8<appender name= "STDOUT"class= "Ch.qos.logback.core.ConsoleAppender" >9<encoder>Ten<pattern>%-5level%logger{0}-%msg%n</pattern> One</encoder> A</appender> -  -<appender name= "FILE"class= "Ch.qos.logback.core.rolling.RollingFileAppender" > the<file>${log.base}/SpringSample.log</file> -<rollingpolicyclass= "Ch.qos.logback.core.rolling.TimeBasedRollingPolicy" > -<fileNamePattern>${log.base}/SpringSample.%d{yyyyMMdd}.%i.log</fileNamePattern> -<timebasedfilenamingandtriggeringpolicyclass= "Ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP" > +<maxFileSize>5MB</maxFileSize> -</timeBasedFileNamingAndTriggeringPolicy> +</rollingPolicy> A<encoder> at<pattern>%date%-5level [%thread]%logger{0} [%file:%line]-%msg%n</pattern> -</encoder> -</appender> -      -<!--3rdparty Logger-- -<logger name= "Org.springframework" level= "${log.level}"/> in<logger name= "org.apache.commons" level= "INFO"/> -<logger name= "Org.apache.tiles" level= "INFO"/> to<logger name= "Org.apache.ibatis" level= "${log.level}"/> +<logger name= "Org.apache.shiro" level= "${log.level}"/> -<logger name= "Org.dozer" level= "INFO"/> the<logger name= "Org.scribe" level= "${log.level}"/> *      $<!--application Logger--Panax Notoginseng<logger name= "Com.rensanning.springboot" level= "${log.level}"/> -      the<!--Root Logger-- +<root level= "${log.level}" > A<appender-ref ref= "STDOUT"/> the<appender-ref ref= "FILE"/> +</root> -  $</configuration>

Access http://localhost:8080/After you start the app.

Console output: DEBUG hellocontroller-debug level Log
INFO Hellocontroller-info Level Log
WARN Hellocontroller-warn Level Log
ERROR Hellocontroller-error Level Log

Springboot Default configuration file:
Base.xml (Console-appender.xml file-appender.xml)
https://github.com/spring-projects/spring-boot/blob/master/spring-boot/src/main/resources/org/springframework/ Boot/logging/logback/base.xml

  1  <included> 2  <include Resource= "Org/springframework/boot/logging/logback/defaults.xml"/> 3  < Property Name= "Log_file" value= "${log_file:-${log_path:-${log_temp:-${java.io.tmpdir:-/tmp}}}/spring.log}"/>< Span style= "COLOR: #008080" > 4  <include resource= "org/springframework/boot/logging/logback/ Console-appender.xml "/> 5  <include resource=" org/springframework/boot/ Logging/logback/file-appender.xml "/> 6  <root level=" INFO "> 7  <appender-ref ref= "CONSOLE"/> 8  < ; Appender-ref ref= "FILE"/> 9  </root>10< /span> </included> 

6. Partial Setup (introduction of Base.xml)
Src/main/resources/application.properties

Reference: Logging.path=d:

Src/main/resources/logback-spring.xml

1 <?xml version= "1.0" encoding= "UTF-8"?>2 <configuration>3     <include Resource= "Org/springframework/boot/logging/logback/base.xml"/>4     <logger name= " Com.rensanning.springboot "level=" WARN "additivity=" false ">5         <appender-ref ref=" CONSOLE "/> 6         <appender-ref ref= "FILE"/>7     </logger>8 </configuration>

Access http://localhost:8080/After you start the app.

Use <springProfile>
Src/main/resources/application.properties

Reference: Logging.path=d:src/main/resources/logback-spring.xml

1<?xml version= "1.0" encoding= "UTF-8"?>2<configuration>3<include resource= "Org/springframework/boot/logging/logback/base.xml"/>4<springprofile name= "Dev,staging" >5<logger name= "Com.rensanning.springboot" level= "DEBUG" additivity= "false" >6<appender-ref ref= "CONSOLE"/>7</logger>8</springProfile>9<springprofile name= "Production" >Ten<logger name= "Com.rensanning.springboot" level= "WARN" additivity= "false" > One<appender-ref ref= "FILE"/> A</logger> -</springProfile> -</configuration>

Add VM Parameters-dspring.profiles.active=dev Access http://localhost:8080/after starting the app.

Use <if><then><else>

Logback through the Janino package also supports conditional judgments in configuration files. http://janino-compiler.github.io/janino/

 <dependency> <groupId>org.codehaus.janino</groupId> <artifactid>janino</ Artifactid> <version>2.7.8</version></dependency> 

<?xml version= "1.0" encoding= "UTF-8"?><configuration> <include    resource= "org/springframework/ Boot/logging/logback/base.xml "/>    <if condition= ' property (" Spring.profiles.active "). Contains ( "Dev") ' >        <then>            <logger name= "Com.rensanning.springboot" level= "DEBUG" additivity= "false" >                <appender-ref ref= "CONSOLE"/>            </logger>        </then>        <else>            <logger name= "Com.rensanning.springboot" level= "WARN" additivity= "false" >                <appender-ref ref= "FILE"/ >            </logger>        </Else>    </if></configuration>

7. Using Log4j2

Pom.xml

1<dependency>2<groupId>org.springframework.boot</groupId>3<artifactId>spring-boot-starter-web</artifactId>4<exclusions>5<exclusion>6<groupId>org.springframework.boot</groupId>7<artifactId>spring-boot-starter-logging</artifactId>8</exclusion>9</exclusions>Ten</dependency> One<dependency> A<groupId>org.springframework.boot</groupId> -<artifactId>spring-boot-starter-log4j2</artifactId> -</dependency>

Src/main/resources/log4j2-spring.xml

<?xml version= "1.0" encoding= "UTF-8"? ><configuration monitorinterval= "The" > <Properties> &LT;PR Operty name= "Log-path" >d:</Property> </Properties> <Appenders> <console name= "Console -appender "target=" System_out "> <PatternLayout> <pattern>                    [%-5level]%d{yyyy-mm-dd HH:mm:ss. SSS} [%t]%c{1}-%msg%N</pattern>> </PatternLayout> </Console> <file name= "File-appender" Filena Me= "${log-path}/springboot_log.log" > <PatternLayout> <pattern>                    [%-5level]%d{yyyy-mm-dd HH:mm:ss. SSS} [%t]%c{1}-%msg%N</pattern> </PatternLayout> </File> </Appenders> <Loggers> &L T Logger name= "Com.rensanning.springboot" level= "info" additivity= "false" > <appenderref ref= "console-append Er "/> </Logger> <Root> <appenderref ref=" File-appender "/> <app Enderref ref= "Console-appender"/> </Root> </Loggers></Configuration>

Access http://localhost:8080/After you start the app.

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Spring Boot Introduction (iii)-Log management