Exception in thread 「main「 java.util.NoSuchElementException
UserDao層代碼 OrdersDao層代碼 OrdersView層代碼 UserView層代碼 報錯視圖： 結果發現這裏居然報錯，經過一番檢查才發現OrdersView層的sc.close();是不能關閉數據流的，所以只要註釋掉就行。
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