Java 日志使用

Step1:maven项目导入依赖

<dependency>

    <groupId>log4j</groupId>

    <artifactId>log4j</artifactId>

    <version>1.2.17</version>

</dependency>

Step2:resources文件夹下创建的log4j.properties,具体内容如下

#Root logger option

log4j.rootLogger=DEBUG, 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

#Redirect log messages to a log file, support file rolling.

log4j.appender.file=org.apache.log4j.RollingFileAppender

log4j.appender.file.File=C:log4j.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

Step3:使用

import org.apache.log4j.Logger;

public class App{

  final static Logger logger = Logger.getLogger(App.class);
#接下来就可以使用
	logger.DEBUG()等