使用SpringMVC注解@RequestParam(value=XXX,required=false)时需

错误描述：

@RequestMapping(value = "/index")public String index(@RequestParam(value = "action", required = false)String action, @RequestParam(value = "notIncludeTypeId", required = false)int notIncludeTypeId){// …. 省略代码}

当可选参数“notIncludeTypeId”为空时，系统出现如下错误：

Optional int parameter 'notIncludeTypeId' is not 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.

错误原因：

当可选参数“notIncludeTypeId”不存在时，Spring默认将其赋值为null，，但由于notIncludeTypeId已定于为基本类型int，所以赋值失败！

解决方法：

“Consider declaring it as object wrapper for the corresponding primitive type.”建议使用包装类型代替基本类型，如使用“Integer”代替“int”

耿耿于怀着过去和忐忑不安着未来的人，也常常挥霍无度着现在。