技術標籤：javaaopproxy

第一步

建立一個user介面

public interface User {
    public void say();
}

建立一個A類，繼承User介面

public class A implements User {

    @Override
    public void say() {
        System.out.println("AAAAAAAAAA");
    }
}

第二步

分別建立Cglib代理類和Jdk動態代理類

@AllArgsConstructor
public class JdkProx
 
 implements InvocationHandler {
    public Object o;
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("JdkProx在什麼之前");
        Object result = method.invoke(this.o, args);
        System.out.println("jdkProx在什麼之後"
 
);
        return result;

    }
}

public class CglibProx implements MethodInterceptor {
    @Override
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        System.out.println("cglib在什麼之前");
        Object o1 = methodProxy.
 
invokeSuper(o, objects);
        System.out.println("cglib在什麼之後");
        return o1;
    }
}

第三步，測試

public class Test {
    public static void main(String[] args) {
        Class<A> aClass = A.class;
        Class<?>[] interfaces = aClass.getInterfaces();
        if (interfaces.length == 0) {
            Enhancer enhancer = new Enhancer();
            enhancer.setSuperclass(A.class);
            enhancer.setCallback(new CglibProx());
            A a = (A) enhancer.create();
            a.say();
        }else {
            JdkProx jdkProx = new JdkProx(new A());
            User user = (User) Proxy.newProxyInstance(aClass.getClassLoader(), interfaces, jdkProx);
            user.say();
        }
    }
}

執行結果

判斷是Jdk動態代理還是Cglib代理主要是看是否繼承了介面，如果有介面則是Jdk動態代理，沒有介面則是cglib代理