前端传分页参数时候，后端报错，提示 存在可选int参数'page'，但由于被声明为基元类型，因此无法转换为null值
原因是后端获取前端传的参数接收给错了，改成@PathVariable接收即可
两者区别：
@RequestParam 和 @PathVariable 注解是用于从 request 中接收请求的，两个都可以接收参数，关键点不同的是@RequestParam 是从 request 里面拿取值，而 @PathVariable 是从一个URI模板里面来填充
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