[英]Factory method bean inheritance in Spring XML configuration
我讀到,在基於XML的Spring配置中,bean可以繼承工廠方法。
我試圖實現它:
控制器接口:
public interface Controller {
String method();
}
ControllerFactory類:
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實現:
public class SampleController implements Controller {
@Override
public String method() {
return "SampleController";
}
}
OtherController實現:
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>
給出編譯時錯誤:
No matching constructor found in class 'Controller'
如何更改它以正確實現工廠方法bean繼承?
將工廠方法配置復制到子bean可以正常工作:
<bean id="otherController" parent="parentController" factory-bean="controllerFactory" factory-method="getController">
<constructor-arg index="0" value="OtherController"/>
</bean>
與ID更改豆parentController
如下:
<bean id="parentController" class="factory.ControllerFactory" factory-bean="controllerFactory" factory-method="getController"> <constructor-arg index="0" value="OtherController"/> </bean>
。
試試這個可能有效。
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