這個錯誤是因為java獲取頁面數據的時候，id值可能為空，而int的默認值為0，若想能夠接受NULL的值，將int換成integer即可解決。
遇到這個錯誤就是把參數int 改成Integer
大家以后在springmvc接受參數的時候，盡量不要使用基本數據類型，當然你一定要使用的話，可以把defaultValue加上，這樣就不會報這個錯誤了。
注意：就算你加上required=false, 一樣也是不行的。
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