java - Spring XML 配置中的工厂方法 bean 继承

Question

我读到，基于 XML 的 Spring 配置 bean 可以继承工厂方法。
我尝试实现它:

Controller 接口(interface):

public interface Controller {
    String method();
}

ControllerFactory类:

public class ControllerFactory {
    public Controller getController(String controllerName){
        switch(controllerName){
            case "OtherController":
                return new OtherController();
            case "SampleController":
                return new SampleController();
            default:
                throw new IllegalArgumentException("Wrong controller name.");
        }
    }
}

SampleController 实现:

public class SampleController implements Controller {
    @Override
    public String method() {
        return "SampleController";
    }
}

其他 Controller 实现:

public class OtherController implements Controller {
    @Override
    public String method() {
        return "OtherController";
    }
}

但是以下 XML 配置:

<!--factory method inheritance -->
<bean id="controllerFactory" class="factory.ControllerFactory"/>
<bean id="parentController" abstract="true" factory-bean="controllerFactory" factory-method="getController"/>
<bean id="otherController" parent="parentController">
    <constructor-arg index="0" value="OtherController"/>
</bean>

给出编译时错误:

No matching constructor found in class 'Controller'

如何更改它以正确实现工厂方法 bean 继承？

将工厂方法配置复制到子 bean 按预期工作:

<bean id="otherController" parent="parentController" factory-bean="controllerFactory" factory-method="getController">
    <constructor-arg index="0" value="OtherController"/>
</bean>

Answer 1

更改 ID 为 parentController 的 bean如下:

<bean id="parentController" class="factory.ControllerFactory" factory-bean="controllerFactory" factory-method="getController">
<constructor-arg index="0" value="OtherController"/>
</bean> .

试试这个可能会起作用。