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我试图通过“介绍”方面向我的bean注入行为 - 但迄今为止尚未成功。
任何帮助表示赞赏。春季介绍人方面
行为为 '介绍':
public interface MinCalculator{
public double min(double a,double b);
}
public class MinCalculatorImpl implements MinCalculator{
public double min(double a,double b){
double result=(a<b)?a:b;
return result;
}
}
实现类:
public class MathsImpl{
public void run(){ System.out.println(" This is me ");}
public static void main(String[] args){
ApplicationContext context = new ClassPathXmlApplicationContext("META-INF/beans-intro.xml");
MathsImpl test = (MathsImpl) context.getBean("MathBean");
test.run();
MinCalculator minI=(MinCalculator)test;
minI.min(4,2);
}
}
在 '引入' 方面:
@Aspect
public class IntroducerAspect {
@DeclareParents(
value="com.aspect.MathsImpl",
defaultImpl=MinCalculatorImpl.class)
public MinCalculator minCalculator;
}
的配置:
<aop:aspectj-autoproxy />
<bean id="MathBean" class="com.aspect.MathsImpl" />
<!-- Aspect -->
<bean id="introAspect" class="com.aspect.IntroducerAspect" />
结果:
INFO: Loading XML bean definitions from class path resource [META-INF/beans-intr
o.xml]
Jul 30, 2013 10:46:32 PM org.springframework.beans.factory.support.DefaultListab
leBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.
[email protected]: defining beans [org.springframework.aop.conf
ig.internalAutoProxyCreator,MathBean,introAspect]; root of factory hierarchy
Exception in thread "main" java.lang.ClassCastException: com.sun.proxy.$Proxy5 c
annot be cast to com.aspect.MathsImpl
at com.aspect.MathsImpl.main(MathsImpl.java:13)
这个工作!上对此的解释将不胜感激。 – IUnknown
[Spring:aop-proxying](http://static.springsource.org/spring/docs/3.2.x/spring-framework-reference/html/aop.html#aop-proxying):使用此选项可启用CGLIB代理方法;因为默认只有接口可以被代理(看看[Java:Proxy](http://docs.oracle.com/javase/7/docs/api/java/lang/reflect/Proxy.html)。 使用CGLIB你也可以代理类,不仅接口(检查'测试'类型,它应该像$$ EnhancerByCGLIB或类似而不是$代理) –