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Spring Boot日志架構
Spring Boot支援Java Util Logging,Log4j2,Lockback作為日志架構,如果你使用starters啟動器,Spring Boot将使用Logback作為預設日志架構。無論使用哪種日志架構,Spring Boot都支援配置将日志輸出到控制台或者檔案中。
spring-boot-starter啟動器包含spring-boot-starter-logging啟動器并內建了slf4j日志抽象及Logback日志架構。
屬性配置日志
Spring Boot支援屬性配置日志參數,這個不是很靈活,不細講。
參考配置:
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# LOGGING
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logging.config= # Location of the logging configuration file. For instance `classpath:logback.xml` for Logback
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logging.exception-conversion-word=%wEx # Conversion word used when logging exceptions.
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logging.file= # Log file name. For instance `myapp.log`
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logging.level.*= # Log levels severity mapping. For instance `logging.level.org.springframework=DEBUG`
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logging.path= # Location of the log file. For instance `/var/log`
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logging.pattern.console= # Appender pattern for output to the console. Only supported with the default logback setup.
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logging.pattern.file= # Appender pattern for output to the file. Only supported with the default logback setup.
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logging.pattern.level= # Appender pattern for log level (default %5p). Only supported with the default logback setup.
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logging.register-shutdown-hook=false # Register a shutdown hook for the logging system when it is initialized.
如:
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logging.level.root=DEBUG
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logging.level.org.springframework.web=DEBUG
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logging.level.org.hibernate=ERROR
自定義日志檔案
根據不同的日志架構,預設加載的日志配置檔案的檔案名,放在資源根目錄下,其他的目錄及檔案名不能被加載。
Logging System | Customization |
---|---|
Logback | logback-spring.xml, logback-spring.groovy, logback.xml or logback.groovy |
Log4j2 | log4j2-spring.xml or log4j2.xml |
JDK (Java Util Logging) | logging.properties |
既然預設自帶了Logback架構,Logback也是最優秀的日志架構,往資源目錄下建立一個logback-spring.xml即可,下面是一個參考配置檔案。
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<?xml version="1.0" encoding="UTF-8"?>
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<configuration debug="false">
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<springProperty scope="context" name="APP_NAME" source="spring.application.name"/>
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<springProperty scope="context" name="APP_PORT" source="server.port"/>
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<springProperty scope="context" name="DEFAULT_APP_PORT" source="spring.application.port"/>
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<property name="OS_NAME" value="${os.name}"/>
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<if condition='property("OS_NAME").contains("Windows")'>
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<then>
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<property name="LOG_PATH" value="${LOG_PATH:-E:/logs}" />
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</then>
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<else>
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<property name="LOG_PATH" value="${LOG_PATH:-/log}" />
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</else>
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</if>
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<property name="LOG_DIR" value="${APP_NAME:-system}" />
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<property name="APP_PORT" value="${APP_PORT:-${DEFAULT_APP_PORT:-0}}" />
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<if condition='!property("APP_PORT").equals("0")'>
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<then>
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<property name="LOG_DIR" value="${LOG_DIR}-${APP_PORT}" />
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</then>
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</if>
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<!-- 控制台輸出 -->
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
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<!--格式化輸出:%d表示日期,%thread表示線程名,%-5level:級别從左顯示5個字元寬度,%msg:日志消息,%n是換行符 -->
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<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
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</encoder>
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</appender>
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<!-- 按照每天生成日志檔案 -->
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<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
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<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
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<level>INFO</level>
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</filter>
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<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
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<!--日志檔案輸出的檔案名 -->
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<FileNamePattern>${LOG_PATH}/${LOG_DIR}/info.log.%d{yyyy-MM-dd}.log</FileNamePattern>
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<!--日志檔案保留天數 -->
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<MaxHistory>30</MaxHistory>
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</rollingPolicy>
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<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
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<!--格式化輸出:%d表示日期,%thread表示線程名,%-5level:級别從左顯示5個字元寬度%msg:日志消息,%n是換行符 -->
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<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
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</encoder>
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<!--日志檔案最大的大小 -->
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<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
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<MaxFileSize>10MB</MaxFileSize>
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</triggeringPolicy>
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</appender>
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<!-- 按照每天生成日志檔案 error級别 -->
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<appender name="FILE-ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
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<filter class="ch.qos.logback.classic.filter.LevelFilter">
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<level>ERROR</level>
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<onMatch>ACCEPT</onMatch>
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<onMismatch>DENY</onMismatch>
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</filter>
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<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
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<!--日志檔案輸出的檔案名 -->
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<FileNamePattern>${LOG_PATH}/${LOG_DIR}/error.log.%d{yyyy-MM-dd}.log</FileNamePattern>
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<!--日志檔案保留天數 -->
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<MaxHistory>30</MaxHistory>
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</rollingPolicy>
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<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
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<!--格式化輸出:%d表示日期,%thread表示線程名,%-5level:級别從左顯示5個字元寬度%msg:日志消息,%n是換行符 -->
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<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
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</encoder>
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<!--日志檔案最大的大小 -->
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<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
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<MaxFileSize>10MB</MaxFileSize>
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</triggeringPolicy>
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</appender>
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<!--myibatis log configure -->
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<logger name="com.apache.ibatis" level="TRACE" />
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<logger name="java.sql.Connection" level="DEBUG" />
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<logger name="java.sql.Statement" level="DEBUG" />
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<logger name="java.sql.PreparedStatement" level="DEBUG" />
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<!-- 日志輸出級别 -->
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<root level="INFO">
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<appender-ref ref="STDOUT" />
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<appender-ref ref="FILE" />
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<appender-ref ref="FILE-ERROR" />
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</root>
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</configuration>
強烈推薦使用logback-spring.xml作為檔案名,因為logback.xml加載太早。
日志初始化在ApplicationContext建立之前,是以@PropertySources加載的配置是讀取不到的,系統環境變量、Spring Environment及application,bootstrap配置檔案中的資訊可以讀取到。
讀取系統環境屬性:
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<property name="LOG_PATH" value="${LOG_PATH:-E:/logs}" />
讀取目前應用Environment中的屬性:
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<springProperty scope="context" name="fluentHost" source="myapp.fluentd.host"
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defaultValue="localhost"/>
Spring Boot也支援通過springProfile來加載不同profiles下的配置。
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<springProfile name="staging">
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<!-- configuration to be enabled when the "staging" profile is active -->
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</springProfile>
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<springProfile name="dev, staging">
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<!-- configuration to be enabled when the "dev" or "staging" profiles are active -->
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</springProfile>
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<springProfile name="!production">