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Java提供的动态代理，是“代理模式”的一个实现。代理模式简介：http://www.cnblogs.com/endlu/p/5169749.html
public class End implements People{
public void say(String s) {
System.out.println("end is saying : " + s);
}
}
public interface People {
public void say(String s);
}
public class EndInvokeHandler implements InvocationHandler {
private People p;
public EndInvokeHandler(People p) {
this.p = p;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
System.out.println("before end say, gusse he will say : " + (String) args[0]);
method.invoke(p, args);
System.out.println("after end say");
return null;
}
}
public class TestDynamicProxy {
public static void main(String[] args) {
End end = new End();
EndInvokeHandler handler = new EndInvokeHandler(end);
Class aClass = end.getClass();
People people = (People) Proxy.newProxyInstance(aClass.getClassLoader(), aClass.getInterfaces(), handler);
people.say("hahaha!");
}
}
输出：
before end say, gusse he will say : hahaha! end is saying : hahaha! after end say
public class End {
public void say(String s) {
System.out.println("end is saying : " + s);
}
}
public class EndInteceptor implements MethodInterceptor {
@Override
public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
System.out.println("before say, i guess he will say : " + objects[0]);
methodProxy.invokeSuper(o, objects);
System.out.println("after end say");
return null;
}
}
public class TestCglib {
public static void main(String[] args) {
End end = new End();
EndInteceptor inteceptor = new EndInteceptor();
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(end.getClass());
enhancer.setCallback(inteceptor);
End endProxy = (End) enhancer.create();
endProxy.say("hello");
}
}
输出：
before say, i guess he will say : hello end is saying : hello after end say
其中MethodInterceptor与jdk中的InvocationHandler是一样的功能。在里面调用被代理的方法时，注意是用方法代理MethodProxy的invokeSuper方法。
由于cglib基于继承机制，所以也有他的限制：不能是final类，final方法也不能被代理。
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原文地址：http://www.cnblogs.com/endlu/p/5171546.html
