common logging在运行时动态查找日志组件，性能不好 slf4j在编译时确定日志组件性能高

pom.xml

<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
		</dependency>
		<dependency>
			<groupId>commons-logging</groupId>
			<artifactId>commons-logging</artifactId>
			<version>1.2</version>
		</dependency>
	</dependencies>