问题描述
我想拦截对某个类 MyClass 的所有方法调用，以便能够对某些 setter 调用做出反应.
I want to intercept all method invocations to some class MyClass to be able to react on some setter-invocations.
我尝试使用动态代理，但据我所知，这只适用于实现某些接口的类.但是MyClass没有这样的接口.
I tried to use dynamic proxies, but as far as I know, this only works for classes implementing some interface. But MyClass does not have such an interface.
除了实现包装类之外，还有什么其他方法可以将所有调用委托给一个成员，该成员是 MyClass 的一个实例或除了使用 AOP 之外?
Is there any other way, besides implementing a wrapper class, that delegates all invocations to a member, which is an instance of the MyClass or besided using AOP?
推荐答案
正如您所注意到的，您不能使用 JDK 动态代理(无接口)，而是使用 Spring 和 CGLIB(Spring 包含的 JAR)，您可以执行以下操作:
As you note, you cannot use JDK dynamic proxies (no interface), but using Spring and CGLIB (JAR included with Spring), you can do the following:
public class Foo
{
public void setBar()
{
throw new UnsupportedOperationException("should not go here");
}
public void redirected()
{
System.out.println("Yiha");
}
}
Foo foo = new Foo();
ProxyFactory pf = new ProxyFactory(foo);
pf.addAdvice(new MethodInterceptor()
{
public Object invoke(MethodInvocation mi) throws Throwable
{
if (mi.getMethod().getName().startsWith("set"))
{
Method redirect = mi.getThis().getClass().getMethod("redirected");
redirect.invoke(mi.getThis());
}
return null;
}
});
Foo proxy = (Foo) pf.getProxy();
proxy.setBar(); // prints "Yiha"
这篇关于如何拦截具有标准 Java 功能(无 AspectJ 等)的方法调用?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！