Optional int parameter ‘id‘ is present but cannot be translated into a null value due to being ……

我不是女神ヾ 2024-04-22 19:12 66阅读 0赞

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> 
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> 
> ?Hello World ！

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### Optional int parameter ‘id’ is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type. ###

> 可选的 int 参数 ‘id’ 存在，但由于被声明为基元类型，因此无法转换为 null 值。请考虑将其声明为相应基元类型的对象包装器
> 
> **错误原因：**
> 
> 遇到这个错误就是把参数int 改成Integer ，springmvc接受参数的时候，尽量不要使用基本数据类型

>  *  原代码
> 
>     @RequestMapping("/toUpdate")
>     public String toUpdatePaper(int id, Model model){
>          
>         Books books = bookService.queryBookById(id);
>         model.addAttribute("books",books);
>         return "updateBook";
>     }
> 
>  *  修改代码
> 
>     @RequestMapping("/toUpdate")
>     public String toUpdatePaper(Interger id, Model model){
>          
>         Books books = bookService.queryBookById(id);
>         model.addAttribute("books",books);
>         return "updateBook";
>     }

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