Log4j日志文件常用配置

1日志级别热修改

web.xml

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org.springframework.web.util.Log4jConfigListener

log4jRefreshInterval

5000

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Spring的Log4jConfiglistener类会调用Log4j的PropertyConfigurator.configureAndWatch()，将刷新间隔作为参数传入。

public static void initLogging(String location, long refreshInterval) throws FileNotFoundException {

String resolvedLocation =SystemPropertyUtils.resolvePlaceholders(location);

File file = ResourceUtils.getFile(resolvedLocation);

if (!file.exists()) {

throw new FileNotFoundException("Log4j config file [" +resolvedLocation + "] not found");

}

if(resolvedLocation.toLowerCase().endsWith(XML_FILE_EXTENSION)) {

DOMConfigurator.configureAndWatch(file.getAbsolutePath(),refreshInterval);

}

else {

PropertyConfigurator.configureAndWatch(file.getAbsolutePath(),refreshInterval);

}

}

2日志文件编码格式

3日志文件保留时间

通过下面配置，可以限制DailyRollingFileAppender保留的文件个数。