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package com.imooc.aop.demo1;public interface UserDao {        public void save();    public void update();    public void delete();    public void find();}

package com.imooc.aop.demo1;public class UserDaoImpl implements UserDao {    public void save() {        System.out.println("保存用户...");    }    public void update() {        System.out.println("修改用户...");    }    public void delete() {        System.out.println("删除用户...");    }    public void find() {        System.out.println("查询用户...");    }}

package com.imooc.aop.demo1;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;public 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);    }}

package com.imooc.aop.demo1;import org.junit.Test;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();    }}

运行结果：权限校验...保存用户...修改用户...删除用户...查询用户...

package com.imooc.aop.demo2;public class ProductDao {        public void save(){        System.out.println("保存商品...");    }    public void update(){        System.out.println("修改商品...");    }    public void delete(){        System.out.println("删除商品...");    }    public void find(){        System.out.println("查询商品...");    }}

package com.imooc.aop.demo2;import org.springframework.cglib.proxy.Enhancer;import org.springframework.cglib.proxy.MethodInterceptor;import org.springframework.cglib.proxy.MethodProxy;import java.lang.reflect.Method;public class MyCglibProxy implements MethodInterceptor{    private ProductDao productDao;    public MyCglibProxy(ProductDao productDao){        this.productDao = productDao;    }    public Object createProxy(){        // 1.创建核心类        Enhancer enhancer = new Enhancer();        // 2.设置父类        enhancer.setSuperclass(productDao.getClass());        // 3.设置回调        enhancer.setCallback(this);        // 4.生成代理        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);    }}

package com.imooc.aop.demo2;import org.junit.Test;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();    }}

运行结果：权限校验===================保存商品...修改商品...删除商品...查询商品...

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