如何使用Spring Boot 1.3.6.Release使Log4j2可由环境配置

Question

我想把这个放在我的房子里

#Place holders for log4j2.xml file
log.file.path=/opt/tomcat/logs
log.file.name=dummydummy
log.file.size=100 MB
log.level=DEBUG

下面是我的log4j2。

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" monitorInterval="30">
    <Properties>
        <Property name="PID">????</Property>
        <property name="name">my-log</property>
    </Properties>
    <Appenders>
        <RollingFile name="file" fileName="${log.file.path}${log.file}.log"
            filePattern="${log.file.path}${log.file}-%d{yyyy-MM-dd}-%i.log.gz">
            <PatternLayout
                pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %5p ${sys:PID} --- [%t] %c{1}(%M:%L) : %m%n%wEx" />
            <Policies>
                <TimeBasedTriggeringPolicy /><!-- Rotated everyday -->
                <SizeBasedTriggeringPolicy size="${log.file.size}" /> <!-- Or every 100 MB -->
            </Policies>
        </RollingFile>
        <Console name="Console" target="SYSTEM_OUT" follow="true">
            <PatternLayout
                pattern="%clr{%d{yyyy-MM-dd HH:mm:ss.SSS}}{faint} %clr{%5p} %clr{${sys:PID}}{magenta} %clr{---}{faint} %clr{[%t]}{faint} %clr{%c{1}(%M:%L)}{cyan} %clr{:}{faint} %m%n%wEx" />
        </Console>
    </Appenders>
    <Loggers>
        <Logger name="org.hibernate.validator.internal.util.Version"
            level="warn" />
        <Logger name="org.apache.coyote.http11.Http11NioProtocol" level="warn" />
        <Logger name="org.apache.tomcat.util.net.NioSelectorPool" level="warn" />
        <Logger name="org.apache.catalina.startup.DigesterFactory" level="error" />
        <Logger name="org.springframework.web" level="error" />

        <Root level="${log.level}">
            <AppenderRef ref="Console" />
            <AppenderRef ref="file" />
        </Root>
    </Loggers>
</Configuration>

Answer 1

properties lookup元素允许从log4j配置中的外部属性文件引用属性。对于您的示例，它应该如下所示：

>

文件env.properties包含以下属性：

log.file.path=/opt/tomcat/logs
log.file.name=dummydummy
log.file.size=100 MB
log.level=DEBUG

属性查找应定义为log4j2.xml的属性：

<Configuration>  
  <Properties>  
      <property name="log.file.path">${bundle:env:log.file.path}</property>  
      <property name="log.file.name">${bundle:env:log.file.name}</property>  
      <property name="log.file.size">${bundle:env:log.file.size}</property>  
      <property name="log.level">${bundle:env:log.level}</property>   
  </Properties>