Spring每次使用實例變量都會返回新實例

這是我的對象定義。

package unittest.prototypetest; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.context.annotation.Scope; 
import org.springframework.stereotype.Component; 

@Component("valObject") 
@Scope("prototype") 
public class ValueObject { 
    private String value1; 
    private String value2; 

    //... getter and setter omitted. 
}

我定義如下組件掃描標籤：

<context:component-scan base-package="unittest" scoped-proxy="targetClass" />

然後我試圖通過ApplicatioinContext得到它的實例，

//ApplicationContextHelper is a class written by me to easily create ApplicationContext 
ValueObject valObject = ApplicationContextHelper.getBean("valObject"); 
valObject.setValue1("v1"); 
valObject.setValue2("v2"); 

System.out.println(valObject.getValue1()); 
System.out.println(valObject.getValue2());

最有線結果如下所示：

2013-01-15_14:04:02.245| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Returning cached instance of singleton bean 'valObject' 
2013-01-15_14:04:02.246| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Creating instance of bean 'scopedTarget.valObject' 
2013-01-15_14:04:02.246| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor' 
2013-01-15_14:04:02.250| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor' 
2013-01-15_14:04:02.250| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor' 
2013-01-15_14:04:02.252| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Finished creating instance of bean 'scopedTarget.valObject' 
2013-01-15_14:04:02.295| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Creating instance of bean 'scopedTarget.valObject' 
2013-01-15_14:04:02.296| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Finished creating instance of bean 'scopedTarget.valObject' 
2013-01-15_14:04:02.296| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Creating instance of bean 'scopedTarget.valObject' 
2013-01-15_14:04:02.296| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Finished creating instance of bean 'scopedTarget.valObject' 
null 
2013-01-15_14:04:02.296| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Creating instance of bean 'scopedTarget.valObject' 
2013-01-15_14:04:02.297| DEBUG | o.s.b.f.s.DefaultListableBeanFactory | Finished creating instance of bean 'scopedTarget.valObject' 
null

您可以在每次使用valObject實例時看到，Spring爲我的訪問創建了一個新實例。，以便系統輸出null，儘管我設置了值。

我做錯了什麼？請告知，非常感謝。

來源

2013-01-15 Matt

我不得不提到的問題是我沒有設置「原型」。請看日誌，每次我調用同一個valObject實例的setValue（）時，Spring不應該創建一個新的實例！ – Matt

您已將範圍設置爲原型，這是非單身人士。閱讀更多關於它here.

來源

2013-01-15 06:12:56 Freedo

我確實希望它是一個「原型」，因爲你看到我的代碼示例，它應該保持相同的實例，因爲我只是問了一次。 – Matt

Spring每次使用實例變量都會返回新實例

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