Spring - AOP之底层实现（动态代理 JDK VS CGLIB）

packagecom.imooc.aop.demo1;
publicinterfaceUserDao {
publicvoidsave();
publicvoidupdate();
publicvoiddelete();
publicvoidfind();
}

packagecom.imooc.aop.demo1;
publicclassUserDaoImplimplementsUserDao {
publicvoidsave() {
System.out.println("保存用户...");
    }
publicvoidupdate() {
System.out.println("修改用户...");
    }
publicvoiddelete() {
System.out.println("删除用户...");
    }
publicvoidfind() {
System.out.println("查询用户...");
    }
}

packagecom.imooc.aop.demo1;
importjava.lang.reflect.InvocationHandler;
importjava.lang.reflect.Method;
importjava.lang.reflect.Proxy;
publicclassMyJdkProxyimplementsInvocationHandler{
privateUserDaouserDao;
publicMyJdkProxy(UserDaouserDao){
this.userDao=userDao;
    }
publicObjectcreateProxy(){
Objectproxy=Proxy.newProxyInstance(userDao.getClass().getClassLoader(),userDao.getClass().getInterfaces(),this);
returnproxy;
    }
publicObjectinvoke(Objectproxy, Methodmethod, Object[] args) throwsThrowable {
if("save".equals(method.getName())){
System.out.println("权限校验...");
returnmethod.invoke(userDao,args);
        }
returnmethod.invoke(userDao,args);
    }
}

packagecom.imooc.aop.demo1;
importorg.junit.Test;
publicclassSpringDemo1 {
@Testpublicvoiddemo1(){
UserDaouserDao=newUserDaoImpl();
UserDaoproxy= (UserDao)newMyJdkProxy(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...

packagecom.imooc.aop.demo2;
publicclassProductDao {
publicvoidsave(){
System.out.println("保存商品...");
    }
publicvoidupdate(){
System.out.println("修改商品...");
    }
publicvoiddelete(){
System.out.println("删除商品...");
    }
publicvoidfind(){
System.out.println("查询商品...");
    }
}

packagecom.imooc.aop.demo2;
importorg.springframework.cglib.proxy.Enhancer;
importorg.springframework.cglib.proxy.MethodInterceptor;
importorg.springframework.cglib.proxy.MethodProxy;
importjava.lang.reflect.Method;
publicclassMyCglibProxyimplementsMethodInterceptor{
privateProductDaoproductDao;
publicMyCglibProxy(ProductDaoproductDao){
this.productDao=productDao;
    }
publicObjectcreateProxy(){
// 1.创建核心类Enhancerenhancer=newEnhancer();
// 2.设置父类enhancer.setSuperclass(productDao.getClass());
// 3.设置回调enhancer.setCallback(this);
// 4.生成代理Objectproxy=enhancer.create();
returnproxy;
    }
publicObjectintercept(Objectproxy, Methodmethod, Object[] args, MethodProxymethodProxy) throwsThrowable {
if("save".equals(method.getName())){
System.out.println("权限校验===================");
returnmethodProxy.invokeSuper(proxy,args);
        }
returnmethodProxy.invokeSuper(proxy,args);
    }
}

packagecom.imooc.aop.demo2;
importorg.junit.Test;
publicclassSpringDemo2 {
@Testpublicvoiddemo1(){
ProductDaoproductDao=newProductDao();
ProductDaoproxy= (ProductDao) newMyCglibProxy(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...