获取spring bean的新实例 [英] Get new instance of a spring bean

问题描述

我有一个名为 MyInterface 的界面。实现 MyInterface 的类（让我们称之为 MyImplClass ）也实现 Runnable 接口所以我可以用它来实例化线程。这是我的代码。

I have an interface called MyInterface. The class that implements MyInterface (lets call it MyImplClass) also implements the Runnable interface so i can use it to instantiate threads. This is my code now.

for (OtherClass obj : someList) {
    MyInterface myInter = new MyImplClass(obj);
    Thread t = new Thread(myInter);
    t.start();
} 

我想要做的是在ApplicationContext.xml中声明实现类并为每次迭代获取一个新实例。所以我的代码看起来像这样：

What i want to do is to declare the implementing class in my ApplicationContext.xml and get a new instance for each iteration. So my code will look something like this:

for (OtherClass obj : someList) {
    MyInterface myInter = // getting the implementation from elsewhere
    Thread t = new Thread(myInter);
    t.start();
} 

我想尽可能保留IoC模式。

我该怎么办？

谢谢

I want to still keep the IoC pattern if possible.
How can i do so?
Thanks

推荐答案

您可以尝试使用弹簧范围原型的工厂模式，如下所示。定义一个抽象工厂类，它将为您提供 MyInterface 对象

You can try factory pattern with spring scope prototype like below. Define a Abstract Factory Class which will give you MyInterface object

public abstract class MyInterfaceFactoryImpl implements MyInterfaceFactory {

@Override
public abstract MyInterface getMyInterface();

}

然后定义Spring bean.xml文件，如下所示。请注意 myinterface bean被定义为原型（所以它总是会给你新实例）。

Then define the Spring bean.xml file as below. Please note myinterface bean is defined as prototype ( So it will always give you new instance).

<bean name="myinterface" class="com.xxx.MyInterfaceImpl" scope="prototype"/>

然后使用工厂方法名称定义factorybean。

Then define the factorybean with factory method name.

<bean name="myinterfaceFactory" class="com.xxx.MyInterfaceFactoryImpl">
    <lookup-method bean="myinterface" name="getMyInterface" />
</bean>

现在你可以调用 myinterfaceFactory 来获取新的实例。

Now you can call myinterfaceFactory to get new instance.

for (OtherClass obj : someList) {
        MyInterface myInter = myInterfaceFactory.getMyInterface();
        Thread t = new Thread(myInter);
        t.start();
}

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