現(xiàn)在很流行springboot的開(kāi)發(fā)，小編閑來(lái)無(wú)事也學(xué)了學(xué)，開(kāi)發(fā)過(guò)程中遇見(jiàn)了log4j日志的一個(gè)小小問(wèn)題，特此記載。

首先在pox.xml中引入對(duì)應(yīng)的maven依賴：

<!-- 引入log4j--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-log4j</artifactId><version>1.3.8.RELEASE</version></dependency>

然后在src/resources/下新建log4j.properties文件（摘抄自網(wǎng)上）：

log4j.rootLogger=info,error,CONSOLE,DEBUG log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout log4j.appender.CONSOLE.layout.ConversionPattern=%d{yyyy-MM-dd-HH-mm} [%t] [%c] [%p] - %m%n log4j.logger.info=info log4j.appender.info=org.apache.log4j.DailyRollingFileAppender log4j.appender.info.layout=org.apache.log4j.PatternLayout log4j.appender.info.layout.ConversionPattern=%d{yyyy-MM-dd-HH-mm} [%t] [%c] [%p] - %m%n log4j.appender.info.datePattern='.'yyyy-MM-dd log4j.appender.info.Threshold = info log4j.appender.info.append=true log4j.appender.info.File=d://springboot3/logs/api_services_info.log log4j.logger.error=error log4j.appender.error=org.apache.log4j.DailyRollingFileAppender log4j.appender.error.layout=org.apache.log4j.PatternLayout log4j.appender.error.layout.ConversionPattern=%d{yyyy-MM-dd-HH-mm} [%t] [%c] [%p] - %m%n log4j.appender.error.datePattern='.'yyyy-MM-dd log4j.appender.error.Threshold = error log4j.appender.error.append=true log4j.appender.error.File=d://springboot3/logs/error/api_services_error.log log4j.logger.DEBUG=DEBUG log4j.appender.DEBUG=org.apache.log4j.DailyRollingFileAppender log4j.appender.DEBUG.layout=org.apache.log4j.PatternLayout log4j.appender.DEBUG.layout.ConversionPattern=%d{yyyy-MM-dd-HH-mm} [%t] [%c] [%p] - %m%n log4j.appender.DEBUG.datePattern='.'yyyy-MM-dd log4j.appender.DEBUG.Threshold = DEBUG log4j.appender.DEBUG.append=true log4j.appender.DEBUG.File=d://springboot3/logs/debug/api_services_debug.log

在application.yml中加入如下配置：

logging:config: src/main/resources/log4j.properties

至此，log4j的配置完畢，啟動(dòng)項(xiàng)目，發(fā)現(xiàn)會(huì)報(bào)錯(cuò)：

SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/C:/Users/tony/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/C:/Users/tony/.m2/repository/org/slf4j/slf4j-log4j12/1.7.25/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder] 12:02:26.963 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Included patterns for restart : [] 12:02:26.969 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Excluded patterns for restart : [/spring-boot-actuator/target/classes/, /spring-boot-devtools/target/classes/, /spring-boot/target/classes/, /spring-boot-starter-[\w-]+/, /spring-boot-autoconfigure/target/classes/, /spring-boot-starter/target/classes/] 12:02:26.969 [main] DEBUG org.springframework.boot.devtools.restart.ChangeableUrls - Matching URLs for reloading : [file:/F:/work_intel/code/demo1/target/classes/] Logging system failed to initialize using configuration from 'src/main/resources/log4j.properties'

這是因?yàn)榕clogback的沖突并未解決，導(dǎo)致啟動(dòng)失敗，根據(jù)上面的報(bào)錯(cuò)信息，找到logback-classic-1.2.3.jar和slf4j-log4j12-1.7.25.jar的相應(yīng)位置刪除，并在pom.xml中加入如下排除代碼：

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><!-- 排除默認(rèn)的logback日志，使用log4j--><exclusions><exclusion><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-logging</artifactId></exclusion><exclusion><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId></exclusion></exclusions></dependency>

啟動(dòng)發(fā)現(xiàn)一切正常，至此，log4j的配置完畢。

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