https://blog.csdn.net/z3133464733/article/details/79189699

init ，destroy，postconstruct，predestroy。从上面链接理解到得好像不太对

没看https://blog.csdn.net/u010900754/article/details/95018759

 

@configuration里面   @value 取配置，@component里面 @autowired把  值注入进来