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This article mainly shows you "how to solve the problems encountered in using @ RequestParam annotations and generics". The content is easy to understand and clear. I hope it can help you solve your doubts. Let the editor lead you to study and learn this article "how to solve the problems encountered in using @ RequestParam annotations and generics".

Use @ RequestParam annotations and generics

The purpose of the @ RequestParam annotation is to give an alias to the passed parameter, but when the parameter contains generics, the annotation does not recognize generics

After removing the @ RequestParam annotation

The function and usage of @ RequestParam annotations

The two simplest ways to write an interface: the difference with or without the @ RequestParam annotation

The parameters of the first writing method are not required, and the parameters of the second writing method are required. Parameter name is userId

The second way of writing can be set to optional via @ RequestParam (required = false). Because the invalid value defaults to true, it must be passed by default.

In the second way, you can specify the parameter name through @ RequestParam ("userId") or @ RequestParam (value = "userId").

The second way of writing is to specify the default value of the parameter through @ RequestParam (defaultValue = "0")

The usage is as follows:

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