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下面是CGLib的原生寫(xiě)法（使用net.sf.cglib.proxy.*包內(nèi)的類實(shí)現(xiàn)）

class Foo {
    public void fun1(){
        System.out.println("fun1");
        fun2();
    }
    public void fun2() {
        System.out.println("fun2");
    }
}

class CGlibProxyEnhancer implements MethodInterceptor{
    public Object getProxy(Class clazz) {
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(clazz);
        enhancer.setCallback(this);
        return enhancer.create();
    }
    @Override
    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
        System.out.print("before ");
        Object result = proxy.invokeSuper(obj,args);
        return result;
    }
}

public class Test {
    public static void main(String[] args) {
        CGlibProxyEnhancer pf = new CGlibProxyEnhancer();
        Foo foo = (Foo) pf.getProxy(Foo.class);
        foo.fun1();
    }
}

打印結(jié)果是：
before fun1
before fun2
可以看到，雖然fun2()是通過(guò)foo.fun1()調(diào)用的，但fun()2依然能被代理。

但如果用Spring AOP那套基本寫(xiě)法的話：

class Foo {
    public void fun1() {
        System.out.println("fun1");
        fun2();
    }
    public void fun2() {
        System.out.println("fun2");
    }
}
class Before implements MethodBeforeAdvice {

    public void before(Method method, Object[] objects, Object o) throws Throwable {
        System.out.print("before ");
    }
}

public class TestCGLib {
    public static void main(String[] args) {
        Foo foo = new Foo();
        BeforeAdvice advice = new Before();
        ProxyFactory pf = new ProxyFactory();
        pf.setOptimize(true);//啟用Cglib2AopProxy創(chuàng)建代理
        pf.setProxyTargetClass(true);
        pf.setTarget(foo);
        pf.addAdvice(advice);
        Foo proxy = (Foo) pf.getProxy();
        proxy.fun1();
    }
}

輸出結(jié)果是：
before fun1
fun2
可見(jiàn)fun2方法沒(méi)有被代理。

為什么會(huì)有這樣的差異？