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在JAVA后台中，使用的最频繁的工具之一就是输出日志的代码。最开始的时候，我是用System.out.println()
输出日志，后来发现，真正的大神输出日志的时候是不会用它的。而是用一种封装好的代码log.info();
我对这种方式输出日志产生了浓厚的兴趣。经过研究才知道，这是log4j中的关于输出日志的api,随后在公司项目中，我多次用到这个工具类。但是随着时间的推移，我越来越发现，输出日志的方式可以是很多种的，比如logger.info();
log.error(); 于是我准备一探究竟…
* 最原始的方法 System.out.println(“这里是输出的日志”);
* 比较常用的方法 public class ApplicationStarter { // 创建日志的实现类 包
org.slf4j.LoggerFactory org.slf4j.Logger; private static Logger logger =
LoggerFactory.getLogger(ApplicationStarter.class); public static void main(
String[] args) { SpringApplication.run(ApplicationStarter.class, args); // 打印日志
logger.debug("\n"+"启动成功！---------------------------"); }
* PlayFrameWork框架自带工具类 Logger.info(“》》》执行成功”); // 来自包 play.Logger
* Lombok自带日志工具 @Slf4j @Configuration public class RedisConfig extends
CachingConfigurerSupport { log.info("test"); // 来自包 lombok.extern.slf4j.Slf4j ｝
