日志log4j

配置

依赖

<dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.25</version> </dependency>

log4j.properties

log4j.rootLogger=info, stdout,file # Redirect log messages to console log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n # Rirect log messages to a log file log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.File=test.log log4j.appender.file.MaxFileSize=5MB log4j.appender.file.MaxBackupIndex=10 log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

log4j简单使用

import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class MyTest { public static final Logger logger = LoggerFactory.getLogger(MyTest.class); public static void main(String[] args) { String username="czp"; logger.info(username); logger.debug(username); logger.warn(username); logger.error(username); } }

级别