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                1. **singleton:** Spring Ioc容器中只會存在一個共享bean實例,無論多少個bean引用它,始終指向同一個對象,默認作用域。 2. **prototype:** 每次通過Spring 容器獲取prototype的bean時,都會創建一個新的bean實例,每個bean實例都有自己的屬性和狀態,而singleton全局只有一個對象。 3. **request:** 在一次http請求中,容器都會返回該bean的同一個實例。而在不同session請求則會創建新的實例,該bean僅在當前session內有效 4. **global session:** 在一個全局的http session中,容器會返回該bean的同一個實例,僅在使用portlet context時有效
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