xml配置
https://www.cnblogs.com/duanxz/p/9435343.html
注解配置
https://www.jianshu.com/p/3561d925816f
线程池:一个是ThreadPoolExecutor java自带的,一个是spring 的ThreadPoolTaskScheduler
http://www.bubuko.com/infodetail-2913945.html?
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线程池实战项目:https://www.jianshu.com/p/e961916e28bd