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                ### Spring Bean的作用域 * 單例(Singleton):在整個應用中,只創建bean的一個實例 * 原型(Prototype):每次注入或者通過Spring應用上下文獲取的時候,都會創建一個新的bean實例 * 會話(Session):在Web應用中,為每個會話創建一個bean實例;如購物車bean來說,會話作用域是最為合適的 * 請求(Rquest):在Web應用中,為每個請求創建一個bean實例 _注意:Sping的單例是Spring容器管理的單例,而不是用單例模式構造的單例;_
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