日志的简单使用，三种方式。

1. org.apache.commons.logging.Log

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   //import org.apache.commons.logging.Log; //import org.apache.commons.logging.LogFactory; private static final Log log = LogFactory.getLog(xxxServiceImpl.class); log.info(Object msg);

2. log4j 1.x 版本：org.apache.log4j.Logger

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   //org.apache.log4j.Logger; private final Logger logger = Logger.getLogger(this.getClass()); logger.info(Object msg);

3. log4j 2.x 版本：org.apache.logging.log4j.Logger

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   private static final Logger logger = LogManager.getLogger(xxxClass.class); logger.info(String msg);

日志的简单使用，两种方式：org.apache.commons.logging.Log日志包，org.apache.log4j.Logger日志包。

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import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
private static final Log log = LogFactory.getLog(this.getClass());

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
private static Logger logger = LoggerFactory.getLogger(xxxClass.class);

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
private static final Logger logger = LogManager.getLogger(xxxClass.class);

import java.util.logging.Logger;
Logger logger = Logger.getLogger("serviceLogger");