SpringAOP underlying implementation, the Acting

There are final modified method of the proxy class can not.

spring using JDK dynamic proxy way for implementation of the interface class, call the library cglib agent does not implement the interface of the class.

1.JDK dynamic proxy:

Acting categories:

ublic class MyJdkProxy implements InvocationHandler{
    private UserDao userDao;

    public MyJdkProxy(UserDao userDao){
        this.userDao = userDao;
    }

    public Object createProxy(){
        Object proxy = Proxy.newProxyInstance(userDao.getClass().getClassLoader(),userDao.getClass().getInterfaces(),this);
        return proxy;
    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        if("save".equals(method.getName())){
            System.out.println("权限校验...");
            return method.invoke(userDao,args);
        }
        return method.invoke(userDao,args);
    }
}

transfer:

public class SpringDemo1 {
    @Test
    public void demo1(){
        UserDao userDao = new UserDaoImpl();

        UserDao proxy = (UserDao)new MyJdkProxy(userDao).createProxy();
        proxy.save();
        proxy.update();
        proxy.delete();
        proxy.find();
    }
}

 

 

2.cglib Agent:

Acting categories:

public class MyCglibProxy implements MethodInterceptor{

    private ProductDao productDao;

    public MyCglibProxy(ProductDao productDao){
        this.productDao = productDao;
    }

    Object createProxy public () {
        // create a core class 1.
        Enhancer Enhancer Enhancer new new = ();
        // Set the parent class 2.
        enhancer.setSuperclass (productDao.getClass ());
        // Sets the callback 3.
        enhancer.setCallback (this );
        // generating agent 4.
        Object proxy enhancer.create = ();
        return proxy;
    }

    public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
        if("save".equals(method.getName())){
            System.out.println("权限校验===================");
            return methodProxy.invokeSuper(proxy,args);
        }
        return methodProxy.invokeSuper(proxy,args);
    }
}
调用：

public class SpringDemo2 {

    @Test
    public void demo1(){
        ProductDao productDao = new ProductDao();

        ProductDao proxy = (ProductDao) new MyCglibProxy(productDao).createProxy();
        proxy.save();
        proxy.update();
        proxy.delete();
        proxy.find();
    }
}