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Commons logging提供统一的log系统接入，基本的commons logging能实现console输出，当然commons logging也提供其它诸如log4j的接入
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
基本输出规则： console输出。
package com.test;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Created by ygshen on 7/23/16.
*/
public class mainclass {
// Logger factory 会查询logging的实现来定义具体的Log方式，如果没有定义诸如log4j的log 实现 那么 //logging使用的是默认的console 输出
private static Log logger= LogFactory.getLog(mainclass.class);
public static void main(String[] args){
logger.info("test information");
logger.error("test error message");
}
}
common logging 可以提供其它高级logging的基础支持。比如log4j
Logging4J+common-logging 使用方法：
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.6.2</version>
</dependency>
commons-logging.properties
org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger
Log4J.properties: 这个配置文件 主要是用来配置Appender的即输出目标，主要包括 consoleAppender, FileAppender
#定义成默认的Console输出
log4j.rootLogger=debug,stdout ### 输出到控制台 ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out ## 输出INFO级别以上的日志 log4j.appender.stdout.Threshold=INFO log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
# Define the root logger with appender file
log=/home/ygshen/WorkSpace/logs
log4j.rootLogger =info,file
### 输出到日志文件 ###
log4j.appender.file = org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File = ${log}/log.out
log4j.appender.file.Append = true
# Define the layout for file appender
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.conversionPattern=%m%n
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原文地址：http://www.cnblogs.com/ygshen/p/5699170.html
