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# Set root logger level to WARN and append to stdout
log4j.rootLogger=INFO,stdout,R,R1
#日志文件输出目标，控制台/文件
#日志输出方式:控制台
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=com.youcompan.project.log4j.Log4jExPatternLayout
log4j.appender.stdout.layout.ConversionPattern=[xxxx] %d %5p %T (%c.%M:%L) - %m%n
#应用服务器日志目录
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=${catalina.home}/logs/ydbudget.log
log4j.appender.R.DatePattern = '.'yyyy-MM-dd'.log'
#log4j.appender.R.MaxFileSize=500KB
log4j.appender.R.layout=com.youcompan.project.log4j.Log4jExPatternLayout
log4j.appender.R.layout.ConversionPattern=[xxxx]%d%5p %T (%C.%M:%L) - %m%n
log4j.appender.R.Append=true
#应用根目录
log4j.appender.R1=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R1.File=${webApp.root}logs/ydbudget.log
log4j.appender.R1.DatePattern = '.'yyyy-MM-dd'.log'
#log4j.appender.R1.MaxFileSize=500KB
log4j.appender.R1.layout=com.youcompan.project.log4j.Log4jExPatternLayout
log4j.appender.R1.layout.ConversionPattern=[xxxx]%d%5p %T (%C.%M:%L) - %m%n
log4j.appender.R1.Append=true
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输出三个地方 配置基本一致， 固然相对路径不一样，按日滚动吧java
其中应用服务器 中${catalina.home}是tomcat系的自带系统变量 ，无需其余配置web
而应用根目录中的${webApp.root} 是在web.xml中经过spring定义的spring
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<
context-param
>
<
param-name
>webAppRootKey</
param-name
>
<
param-value
>webApp.root</
param-value
>
</
context-param
>
<
context-param
>
<
param-name
>log4jConfigLocation</
param-name
>
<
param-value
>classpath:log4j.properties</
param-value
>
</
context-param
>
<
listener
>
<
listener-class
>org.springframework.web.util.Log4jConfigListener</
listener-class
>
</
listener
>
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如今来看布局类的定义和pattern的配置，apache
Log4jExPatternLayout 这个类是继承自 org.apache.log4j.PatternLayout ，其主要功能就是为了让 pattern 中的 %T 显示 线程号，上代码，tomcat
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public
class
Log4jExPatternLayout
extends
PatternLayout {
public
Log4jExPatternLayout(String pattern){
super
(pattern);
}
public
Log4jExPatternLayout(){
super
();
}
/**
* 重写createPatternParser方法，返回PatternParser的子类
*/
@Override
protected
PatternParser createPatternParser(String pattern) {
return
new
Log4jExPatternParser(pattern);
}
}
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public
class
Log4jExPatternParser
extends
PatternParser {
public
Log4jExPatternParser(String pattern) {
super
(pattern);
}
/**
* 重写finalizeConverter，对特定的占位符进行处理，T表示线程ID占位符
*/
@Override
protected
void
finalizeConverter(
char
c) {
if
(c ==
'T'
) {
this
.addConverter(
new
ExPatternConverter(
this
.formattingInfo));
}
else
{
super
.finalizeConverter(c);
}
}
private
static
class
ExPatternConverter
extends
PatternConverter {
public
ExPatternConverter(FormattingInfo fi) {
super
(fi);
}
/**
* 当须要显示线程ID的时候，返回当前调用线程的ID
*/
@Override
protected
String convert(LoggingEvent event) {
return
String.valueOf(Thread.currentThread().getId());
}
}
}
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参考文档忘记了，这篇文章是后来整理的，感谢他们吧服务器