这里的原子有什么作用啊，用来显示消息，那为啥不能直接string类型。 AtomicReference的用法和作用是啥？
AtomicReference<String> msg
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hywcsdn2017 2018-03-08 10:07关注msg里存放的信息，等到了前台页面的时候取出来在展示给用户，AtomicReference保证了赋值操作的安全性
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