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技术 2022年11月9日
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乍一看这个方法,以为什么消息都能输出,因为参数是Object类型的,但实际上,netty内部只支持两种类型,如图

<img src="data:image/png;base64,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" alt="">

所以,不要想当然的扔个Object进去

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