AOP的底层实现,动态代理和cglib代理

JDK动态代理
public Object proxy(Object target){
    Object proxyInstance = Proxy.newProxyInstance(
            MyJDKProxyTransactionManager.class.getClassLoader(),
            target.getClass().getInterfaces(),
            new InvocationHandler() {
                @Override
                public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                    Object o = null;
                    try {
                        System.out.println("开启事物");
                        jdbcConnectionUtils.openTx();
                        o = method.invoke(target, args);
                        jdbcConnectionUtils.commitAndClose();
                        System.out.println("提交事物");
                        return o;
                    } catch (Exception e) {
                        e.printStackTrace();
                        jdbcConnectionUtils.rollbackAndClose();
                    }
                    return o;
                }
            }
    );
    return proxyInstance;
}





cglib代理

public static void main(String[] args) {
    Enhancer enhancer = new Enhancer();
    MyCar myCar = new MyCar();
    enhancer.setSuperclass(myCar.getClass());
    enhancer.setCallback(new MethodInterceptor() {
        @Override
        public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
            Object o = null;
            try {
                System.out.println("cglib 代理前");
                o = method.invoke(myCar, args);
                System.out.println("cglib代理后");
                return o;
            } catch (Exception e) {
                e.printStackTrace();
            }
            return o;
        }
    });
    MyCar cglibCar = (MyCar) enhancer.create();
    cglibCar.jump();
    cglibCar.run();
}