Log4j 配置和使用

1、maven 依赖

<!-- https://mvnrepository.com/artifact/log4j/log4j --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>

2、log4j.properties 配置

#log4j.path=/Users/tinybye/Documents/log4j/ log4j.path=H://test/ ### 设置 ### #log4j.rootLogger = [level] , appenderName1, appenderName2,blablabla... log4j.rootLogger=info,stdout,DDD,EEE #log4j.rootLogger=info,stdout ### 输出信息到控制台 ### 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=[%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n ### 输出DEBUG 级别以上的日志到=/Users/tinybye/Documents/log4j/debug.log ### log4j.appender.DDD=org.apache.log4j.DailyRollingFileAppender log4j.appender.DDD.File=H://test/debug.log log4j.appender.DDD.Append=true log4j.appender.DDD.Threshold=DEBUG log4j.appender.DDD.layout=org.apache.log4j.PatternLayout log4j.appender.DDD.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n ### 输出ERROR 级别以上的日志到=/Users/tinybye/Documents/log4j/error.log ### log4j.appender.EEE=org.apache.log4j.DailyRollingFileAppender log4j.appender.EEE.File=H://test/error.log log4j.appender.EEE.Append=true log4j.appender.EEE.Threshold=ERROR log4j.appender.EEE.layout=org.apache.log4j.PatternLayout log4j.appender.EEE.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n

3、使用

import org.apache.log4j.Logger; import org.apache.log4j.PropertyConfigurator; import java.util.HashMap; import java.util.List; import java.util.Map; /** * <p> project: </p> * <p> Title: ${TITLE} </p> * <p>Description: ${DESCRIPTION} </p> * <p>Copyright: Copyright (c) </p> * <p>Company: </p> * <p>Created by liangxs on 2018-07-05 11:44.</p> * * @version 1.0 */ public class DBTest { private static Logger log = Logger.getLogger(DBTest.class); public static MySQLDBUtil dbUtil = null; public static void main(String[] args) { PropertyConfigurator.configure(ClassLoader.getSystemResource("log4j.properties")); log.info("info"); log.debug("debug"); log.error("error"); log.info("info"); } }