Java Log Usage

Step1:maven Project Import Dependency

<dependency>    <groupId>log4j</groupId>    <artifactId>log4j</artifactId>    <version>1.2.17</version></dependency>

Step2:resources folder created under the Log4j.properties, the specific content is as follows

#Root logger optionlog4j.rootLogger=DEBUG, stdout, file#Redirect log messages to consolelog4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.Target=System.outlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.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.RollingFileAppenderlog4j.appender.file.File=C:\log4j.loglog4j.appender.file.MaxFileSize=5MBlog4j.appender.file.MaxBackupIndex=10log4j.appender.file.layout=org.apache.log4j.PatternLayoutlog4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

STEP3: Using

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

Java Log Usage