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The annotation is self-defined by implementing the parameter parser handlermethodargumentresolver interface

2022-04-23 08:18:00 【hungry＆foolish】

HandlerMethodArgumentResolver Similar to interceptors , Is a parameter parser , We can implement... By writing a class HandlerMethodArgumentResolver Interface to implement Controller Modification of method parameters in layer

Custom parser needs to be implemented HandlerMethodArgumentResolver Interface ,HandlerMethodArgumentResolver The interface contains two interface functions :
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When supportsParameter return True when , Will call resolveArgument.

example ：
Declare custom annotations （ Used to get the user's userid）
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Write a LoginUserHandlerMethodArgumentResolver Class implementation HandlerMethodArgumentResolver Interface
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stay resolveArgument Will get token, And then according to token obtain userid And back to

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