使用maven管理項目時,在pom.xml中加入slf4j和log4j的jar包依賴:
<!-- Logging configuration: start -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.10</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.10</version>
</dependency>
<!-- Logging configuration: end -->
maven會自動加入所依賴的jar包:
在src/main/resources中加入log4j.properties文件,內容如下:
#config root logger
log4j.rootLogger = INFO,system.out
log4j.appender.system.out=org.apache.log4j.ConsoleAppender
log4j.appender.system.out.layout=org.apache.log4j.PatternLayout
log4j.appender.system.out.layout.ConversionPattern=MINAServer Logger-->%5p{%F:%L}-%m%n
#config this Project.file logger
log4j.logger.thisProject.file=INFO,thisProject.file.out
log4j.appender.thisProject.file.out=org.apache.log4j.DailyRollingFileAppender
log4j.appender.thisProject.file.out.File=logContentFile.log
log4j.appender.thisProject.file.out.layout=org.apache.log4j.PatternLayout
程序中使用logger的簡單示例:
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class HelloWorld {
public static void main(String[] args) {
Logger logger = LoggerFactory.getLogger(HelloWorld.class);
logger.info("Hello World");
}
}
控制檯輸出結果:
MINAServer Logger--> INFO{HelloWorld.java:9}-Hello World