专注 K8S研究
分类: 系统运维
2018-04-08 11:52:42
Java应用中,日志一般分为以下5个级别:
Spring Boot使用Apache的Commons Logging作为内部的日志框架,其仅仅是一个日志接口,在实际应用中需要为该接口来指定相应的日志实现。
SpringBt默认的日志实现是Java Util Logging,是JDK自带的日志包,此外SpringBt当然也支持Log4J、Logback这类很流行的日志实现。
统一将上面这些日志实现统称为日志框架
下面我们来实践一下!
logging.level.root=INFO
package com.hansonwang99.controller; import com.hansonwang99.K8sresctrlApplication; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping("/testlogging") public class LoggingTestController { private static Logger logger = LoggerFactory.getLogger(K8sresctrlApplication.class); @GetMapping("/hello") public String hello() {
logger.info("test logging..."); return "hello";
}
}
由于将日志等级设置为INFO,因此包含INFO及以上级别的日志信息都会打印出来
这里可以看出,很多大部分的INFO日志均来自于SpringBt框架本身,如果我们想屏蔽它们,可以将日志级别统一先全部设置为ERROR,这样框架自身的INFO信息不会被打印。然后再将应用中特定的包设置为DEBUG级别的日志,这样就可以只看到所关心的包中的DEBUG及以上级别的日志了。
application.yml中改配置
logging: level: root: error com.hansonwang99.controller: debug
很明显,将root日志级别设置为ERROR,然后再将com.hansonwang99.controller包的日志级别设为DEBUG,此即:即先禁止所有再允许个别的 设置方法
package com.hansonwang99.controller; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping("/testlogging") public class LoggingTestController { private Logger logger = LoggerFactory.getLogger(this.getClass()); @GetMapping("/hello") public String hello() {
logger.info("test logging..."); return "hello";
}
}
可见框架自身的INFO级别日志全部藏匿,而指定包中的日志按级别顺利地打印出来
logging:
level:
root: error
com.hansonwang99.controller: debug
file: ${user.home}/logs/hello.log
使用Spring Boot Logging,我们发现虽然日志已输出到文件中,但控制台中依然会打印一份,发现用org.slf4j.Logger是无法解决这个问题的
<dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-webartifactId> <exclusions> <exclusion> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-loggingartifactId> exclusion> exclusions> dependency> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-log4j2artifactId> dependency>
xml version="1.0" encoding="UTF-8"?> <configuration> <appenders> <File name="file" fileName="${sys:user.home}/logs/hello2.log"> <PatternLayout pattern="%d{HH:mm:ss,SSS} %p %c (%L) - %m%n"/> File> appenders> <loggers> <root level="ERROR"> <appender-ref ref="file"/> root> <logger name="com.hansonwang99.controller" level="DEBUG" /> loggers> configuration>
运行程序发现控制台没有日志输出,而hello2.log文件中有内容,这符合我们的预期:
而且日志格式和pattern="%d{HH:mm:ss,SSS} %p %c (%L) - %m%n"格式中定义的相匹配
<dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-webartifactId> <exclusions> <exclusion> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-loggingartifactId> exclusion> exclusions> dependency> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-log4j2artifactId> dependency>
xml version="1.0" encoding="UTF-8"?> <configuration status="warn"> <properties> <Property name="app_name">springboot-webProperty> <Property name="log_path">logs/${app_name}Property> properties> <appenders> <console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="[%d][%t][%p][%l] %m%n" /> console> <RollingFile name="RollingFileInfo" fileName="${log_path}/info.log" filePattern="${log_path}/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log.gz"> <Filters> <ThresholdFilter level="INFO" /> <ThresholdFilter level="WARN" onMatch="DENY" onMismatch="NEUTRAL" /> Filters> <PatternLayout pattern="[%d][%t][%p][%c:%L] %m%n" /> <Policies> <TimeBasedTriggeringPolicy interval="1" modulate="true" /> <SizeBasedTriggeringPolicy size="2 MB" /> Policies> <DefaultRolloverStrategy compressionLevel="0" max="10"/> RollingFile> <RollingFile name="RollingFileWarn" fileName="${log_path}/warn.log" filePattern="${log_path}/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log.gz"> <Filters> <ThresholdFilter level="WARN" /> <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL" /> Filters> <PatternLayout pattern="[%d][%t][%p][%c:%L] %m%n" /> <Policies> <TimeBasedTriggeringPolicy interval="1" modulate="true" /> <SizeBasedTriggeringPolicy size="2 MB" /> Policies> <DefaultRolloverStrategy compressionLevel="0" max="10"/> RollingFile> <RollingFile name="RollingFileError" fileName="${log_path}/error.log" filePattern="${log_path}/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log.gz"> <ThresholdFilter level="ERROR" /> <PatternLayout pattern="[%d][%t][%p][%c:%L] %m%n" /> <Policies> <TimeBasedTriggeringPolicy interval="1" modulate="true" /> <SizeBasedTriggeringPolicy size="2 MB" /> Policies> <DefaultRolloverStrategy compressionLevel="0" max="10"/> RollingFile> appenders> <loggers> <root level="info"> <appender-ref ref="Console" /> <appender-ref ref="RollingFileInfo" /> <appender-ref ref="RollingFileWarn" /> <appender-ref ref="RollingFileError" /> root> loggers> configuration>
package com.hansonwang99.controller; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping("/testlogging") public class LoggingTestController { private final Logger logger = LogManager.getLogger(this.getClass()); @GetMapping("/hello") public String hello() { for(int i=0;i<10_0000;i++){
logger.info("info execute index method");
logger.warn("warn execute index method");
logger.error("error execute index method");
} return "My First SpringBoot Application";
}
}
日志会根据不同的级别存储在不同的文件,当日志文件大小超过2M以后会分多个文件压缩存储,生产环境的日志文件大小建议调整为20-50MB。