AOP分析

Posted wangsong

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cglib动态代理

Waiter target = new NaiveWaiter();//一个实现了Waiter接口的类
BeforeAdvice advice = new GreetingBeforeAdvice();//一个实现了MethodBeforeAdvice的类
//spring提供的代理工厂
ProxyFactory pf = new ProxyFactory();
//设置代理目标
pf.setTarget(target);
//为代理目标添加增强
pf.addAdvice(advice);
//生成代理实例
Waiter proxy = (Waiter) pf.getProxy();
proxy.greetTo("Brian");
        

public interface MethodBeforeAdvice extends BeforeAdvice {
	
	/**
	 * Callback before a given method is invoked.
	 * @param method method being invoked
	 * @param args arguments to the method
	 * @param target target of the method invocation. May be <code>null</code>.
	 * @throws Throwable if this object wishes to abort the call.
	 */
	void before(Method method, Object[] args, Object target) throws Throwable;

}

技术分享图片

spring提供的代理工厂new ProxyFactory();

//其父类ProxyCreatorSupport
public ProxyCreatorSupport() {
	this.aopProxyFactory = new DefaultAopProxyFactory();
}

设置代理目标 pf.setTarget(target);

//进入ProxyFactory的父类AdvisedSupport
public void setTarget(Object target) {
    setTargetSource(new SingletonTargetSource(target));
}

public void setTargetSource(TargetSource targetSource) {
	this.targetSource = (targetSource != null ? targetSource : EMPTY_TARGET_SOURCE);
}

public SingletonTargetSource(Object target) {
	Assert.notNull(target, "Target object must not be null");
	this.target = target;
}

为代理目标添加增强pf.addAdvice(advice);

/**
 * List of Advisors. If an Advice is added, it will be wrapped
 * in an Advisor before being added to this List.
 */
private List advisors = new LinkedList(); //advice就是一个声明，跟serializble一样

//进入AdvisedSupport
public void addAdvice(Advice advice) throws AopConfigException {
    int pos = this.advisors.size();
    addAdvice(pos, advice);
}

public void addAdvice(int pos, Advice advice) throws AopConfigException {
	Assert.notNull(advice, "Advice must not be null");
	if (advice instanceof IntroductionInfo) {
		addAdvisor(pos, new DefaultIntroductionAdvisor(advice, (IntroductionInfo) advice));
	}
	else if (advice instanceof DynamicIntroductionAdvice) {
		throw new AopConfigException("DynamicIntroductionAdvice may only be added as part of IntroductionAdvisor");
	}
	else {
		addAdvisor(pos, new DefaultPointcutAdvisor(advice)); //普通的advice走这里
	}
}


public DefaultPointcutAdvisor(Advice advice) {
	this(Pointcut.TRUE, advice);//Pointcut.TRUE表示所有方法，所有类都匹配
}

public DefaultPointcutAdvisor(Pointcut pointcut, Advice advice) {
	this.pointcut = pointcut;
	setAdvice(advice);
}

//进入AbstractGenericPointcutAdvisor
public void setAdvice(Advice advice) {
	this.advice = advice;
}

public void addAdvisor(int pos, Advisor advisor) throws AopConfigException {
	if (advisor instanceof IntroductionAdvisor) {
		validateIntroductionAdvisor((IntroductionAdvisor) advisor);
	}
	addAdvisorInternal(pos, advisor);
}

private void addAdvisorInternal(int pos, Advisor advisor) throws AopConfigException {
    ...
	this.advisors.add(pos, advisor);
	...
}

生成代理实例pf.getProxy();

//进入ProxyFactory
public Object getProxy() {
	return createAopProxy().getProxy();
}

//进入父类ProxyCreatorSupport
protected final synchronized AopProxy createAopProxy() {
        ...
	return getAopProxyFactory().createAopProxy(this);
}

//进入DefaultAopProxyFactory
public AopProxy createAopProxy(AdvisedSupport config) throws AopConfigException {
	if (config.isOptimize() || config.isProxyTargetClass() || hasNoUserSuppliedProxyInterfaces(config)) {
		Class<?> targetClass = config.getTargetClass();
		...
		if (targetClass.isInterface() || Proxy.isProxyClass(targetClass)) {
			return new JdkDynamicAopProxy(config);
		}
		return new ObjenesisCglibAopProxy(config); //走cglib
	}
	else {
		return new JdkDynamicAopProxy(config); //走jdk动态代理
	}
}
	
//进入ObjenesisCglibAopProxy的父类CglibAopProxy
public CglibAopProxy(AdvisedSupport config) throws AopConfigException {
    ...
	this.advised = config;
	this.advisedDispatcher = new AdvisedDispatcher(this.advised);
}

//CglibAopProxy
public Object getProxy() {
		return getProxy(null);
	}
	
	
public Object getProxy(ClassLoader classLoader) {
...
	Class<?> rootClass = this.advised.getTargetClass();

	Class<?> proxySuperClass = rootClass;
    ...
    
	// Validate the class, writing log messages as necessary.
	validateClassIfNecessary(proxySuperClass, classLoader);

	// Configure CGLIB Enhancer...
	Enhancer enhancer = createEnhancer();
	...
	enhancer.setSuperclass(proxySuperClass);
	enhancer.setInterfaces(AopProxyUtils.completeProxiedInterfaces(this.advised));
	enhancer.setNamingPolicy(SpringNamingPolicy.INSTANCE);
	enhancer.setStrategy(new ClassLoaderAwareUndeclaredThrowableStrategy(classLoader));

    ....
	// Generate the proxy class and create a proxy instance.
	return createProxyClassAndInstance(enhancer, callbacks);
}

//子类ObjenesisCglibAopProxy实现，无构造器创建对象
protected Object createProxyClassAndInstance(Enhancer enhancer, Callback[] callbacks) {
	Class<?> proxyClass = enhancer.createClass();
	Object proxyInstance = null;

	if (objenesis.isWorthTrying()) {
		proxyInstance = objenesis.newInstance(proxyClass, enhancer.getUseCache());
	}

	if (proxyInstance == null) {
		// Regular instantiation via default constructor...
		proxyInstance = (this.constructorArgs != null ?
				proxyClass.getConstructor(this.constructorArgTypes).newInstance(this.constructorArgs) :
				proxyClass.newInstance());
	}

	((Factory) proxyInstance).setCallbacks(callbacks);
	return proxyInstance;
}
进入Cglib2AopProxy的静态内部类DynamicAdvisedInterceptor
    public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
			MethodInvocation invocation = null;
			Object oldProxy = null;
			boolean setProxyContext = false;
			Class targetClass = null;
			Object target = null;
			try {
				Object retVal = null;
				...
				target = getTarget();
				if (target != null) {
					targetClass = target.getClass();
				}
				List chain = this.advised.getInterceptorsAndDynamicInterceptionAdvice(method, targetClass);
				if (chain.isEmpty() && Modifier.isPublic(method.getModifiers())) {
					retVal = methodProxy.invoke(target, args);
				}
				else {
					invocation = new CglibMethodInvocation(proxy, target, method, args,
							targetClass, chain, methodProxy);
					retVal = invocation.proceed(); //执行拦截器链,同下文jdk动态代理的aop一样
				}

				retVal = massageReturnTypeIfNecessary(proxy, target, method, retVal);
				return retVal;
			}
			....
		}

指定接口进行jdk动态代理

Waiter target = new NaiveWaiter();
BeforeAdvice advice = new GreetingBeforeAdvice();
//spring提供的代理工厂
ProxyFactory pf = new ProxyFactory();
//指定接口进行代理
pf.setInterfaces(target.getClass().getInterfaces());

//pf.setOptimize(true);//启用优化后则还将使用Cglib2AopProxy代理

//设置代理目标
pf.setTarget(target);
//为代理目标添加增强
pf.addAdvice(advice);
//生成代理实例
Waiter proxy = (Waiter) pf.getProxy();

指定接口进行代理

//进入AdvisedSupport
public void setInterfaces(Class<?>... interfaces) {
	this.interfaces.clear();
	for (Class<?> ifc : interfaces) {
		addInterface(ifc);
	}
}

public void addInterface(Class<?> intf) {
    ...
    if (!this.interfaces.contains(intf)) {
		this.interfaces.add(intf);
		...
	}
}
...

//获取代理，进入JdkDynamicAopProxy
public Object getProxy() {
		return getProxy(ClassUtils.getDefaultClassLoader()); //获取应用类加载器
	}
	
	public Object getProxy(ClassLoader classLoader) {
	    ...
		Class<?>[] proxiedInterfaces = AopProxyUtils.completeProxiedInterfaces(this.advised); //获得需要代理的接口
		findDefinedEqualsAndHashCodeMethods(proxiedInterfaces); //对Object的方法特殊处理
		return Proxy.newProxyInstance(classLoader, proxiedInterfaces, this);//经典的jdk动态代理
	}
	
	public static Class<?>[] completeProxiedInterfaces(AdvisedSupport advised) {
		Class<?>[] specifiedInterfaces = advised.getProxiedInterfaces();
		...
		boolean addSpringProxy = !advised.isInterfaceProxied(SpringProxy.class);//有没有接口是SpringProxy的子类，这是个标志接口
		boolean addAdvised = !advised.isOpaque() && !advised.isInterfaceProxied(Advised.class);//opaque表示是否禁止将代理对象转换为Advised对象
		int nonUserIfcCount = 0;
		if (addSpringProxy) {
			nonUserIfcCount++;
		}
		if (addAdvised) {
			nonUserIfcCount++;
		}
		Class<?>[] proxiedInterfaces = new Class<?>[specifiedInterfaces.length + nonUserIfcCount];
		System.arraycopy(specifiedInterfaces, 0, proxiedInterfaces, 0, specifiedInterfaces.length);
		if (addSpringProxy) {
			proxiedInterfaces[specifiedInterfaces.length] = SpringProxy.class;
		}//一个标志类，由spring生产的
		if (addAdvised) {
			proxiedInterfaces[proxiedInterfaces.length - 1] = Advised.class;
		} //Advised是一个代理配置类
		return proxiedInterfaces;//又添加了俩接口
	}
	
	private void findDefinedEqualsAndHashCodeMethods(Class<?>[] proxiedInterfaces) {
		for (Class<?> proxiedInterface : proxiedInterfaces) {
			Method[] methods = proxiedInterface.getDeclaredMethods();
			for (Method method : methods) {
				if (AopUtils.isEqualsMethod(method)) {
					this.equalsDefined = true;
				}
				if (AopUtils.isHashCodeMethod(method)) {
					this.hashCodeDefined = true;
				}
				if (this.equalsDefined && this.hashCodeDefined) {
					return; //发现有复写equals和hashcode，接下来要进行代理
				}
			}
		}
	}

当调用具体方法时proxy.greetTo("Brian");

final class JdkDynamicAopProxy implements ..., InvocationHandler {

public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		MethodInvocation invocation;
		Object oldProxy = null;
		boolean setProxyContext = false;

		TargetSource targetSource = this.advised.targetSource;//要被代理的对象
		Class<?> targetClass = null;
		Object target = null;

		try {
			if (!this.equalsDefined && AopUtils.isEqualsMethod(method)) {
				// The target does not implement the equals(Object) method itself.
				return equals(args[0]);
			}
			if (!this.hashCodeDefined && AopUtils.isHashCodeMethod(method)) {
				// The target does not implement the hashCode() method itself.
				return hashCode();
			}
			if (!this.advised.opaque && method.getDeclaringClass().isInterface() &&
					method.getDeclaringClass().isAssignableFrom(Advised.class)) { //调用了advised的方法
				// Service invocations on ProxyConfig with the proxy config...
				return AopUtils.invokeJoinpointUsingReflection(this.advised, method, args);
			}

			Object retVal;
			...

			target = targetSource.getTarget(); //获取代理对象
			if (target != null) {
				targetClass = target.getClass();
			}

			// Get the interception chain for this method.
			List<Object> chain = this.advised.getInterceptorsAndDynamicInterceptionAdvice(method, targetClass);

			// 没有advice，走简单反射
			if (chain.isEmpty()) {
				Object[] argsToUse = AopProxyUtils.adaptArgumentsIfNecessary(method, args);//主要针对可变参数
				retVal = AopUtils.invokeJoinpointUsingReflection(target, method, argsToUse);
			}
			else {
				// We need to create a method invocation...
				invocation = new ReflectiveMethodInvocation(proxy, target, method, args, targetClass, chain); //执行拦截器链的总入口
				// Proceed to the joinpoint through the interceptor chain.
				retVal = invocation.proceed();
			}
			
			...
			return retVal;
		}
		...
	}
}


public List<Object> getInterceptorsAndDynamicInterceptionAdvice(Method method, Class<?> targetClass) {
	MethodCacheKey cacheKey = new MethodCacheKey(method);
	List<Object> cached = this.methodCache.get(cacheKey);//缓存机制，毕竟构造耗时
	if (cached == null) {
		cached = this.advisorChainFactory.getInterceptorsAndDynamicInterceptionAdvice(
				this, method, targetClass);//获得某方法对应的Interceptor
		this.methodCache.put(cacheKey, cached);
	}
	return cached;
}

//进入DefaultAdvisorChainFactory
public List<Object> getInterceptorsAndDynamicInterceptionAdvice(
			Advised config, Method method, Class<?> targetClass) {

		List<Object> interceptorList = new ArrayList<Object>(config.getAdvisors().length); //里面存着MethodInterceptor
		Class<?> actualClass = (targetClass != null ? targetClass : method.getDeclaringClass());
		boolean hasIntroductions = hasMatchingIntroductions(config, actualClass);
		AdvisorAdapterRegistry registry = GlobalAdvisorAdapterRegistry.getInstance();//返回一个DefaultAdvisorAdapterRegistry

		for (Advisor advisor : config.getAdvisors()) {
			if (advisor instanceof PointcutAdvisor) {//我们的DefaultPointcutAdvisor
				// Add it conditionally.
				PointcutAdvisor pointcutAdvisor = (PointcutAdvisor) advisor;
				if (config.isPreFiltered() || pointcutAdvisor.getPointcut().getClassFilter().matches(actualClass)) { //匹配指定类
					MethodInterceptor[] interceptors = registry.getInterceptors(advisor); //获得方法拦截器
					MethodMatcher mm = pointcutAdvisor.getPointcut().getMethodMatcher();
					if (MethodMatchers.matches(mm, method, actualClass, hasIntroductions)) {//匹配指定方法
				        	...
						interceptorList.addAll(Arrays.asList(interceptors));//又转成list了
					}
				}
			}
			...
		}

		return interceptorList;
	}
	
	
	//进入DefaultAdvisorAdapterRegistry
	public MethodInterceptor[] getInterceptors(Advisor advisor) throws UnknownAdviceTypeException {
		List<MethodInterceptor> interceptors = new ArrayList<MethodInterceptor>(3);
		Advice advice = advisor.getAdvice();
		if (advice instanceof MethodInterceptor) {
			interceptors.add((MethodInterceptor) advice); //如果实现了MethodInterceptor接口直接加入
		}
		for (AdvisorAdapter adapter : this.adapters) {
			if (adapter.supportsAdvice(advice)) { //是否实现了相应advice
				interceptors.add(adapter.getInterceptor(advisor));
			}
		}
		...
		return interceptors.toArray(new MethodInterceptor[interceptors.size()]);//转化为数组返回
	}
	
	//DefaultAdvisorAdapterRegistry在构造时会创建这三种adapter
	public DefaultAdvisorAdapterRegistry() {
		registerAdvisorAdapter(new MethodBeforeAdviceAdapter());
		registerAdvisorAdapter(new AfterReturningAdviceAdapter());
		registerAdvisorAdapter(new ThrowsAdviceAdapter());
	}
	
	//以MethodBeforeAdviceAdapter为例
	public boolean supportsAdvice(Advice advice) {
		return (advice instanceof MethodBeforeAdvice);
	}

	public MethodInterceptor getInterceptor(Advisor advisor) {
		MethodBeforeAdvice advice = (MethodBeforeAdvice) advisor.getAdvice();
		return new MethodBeforeAdviceInterceptor(advice);
	}
	
	
	protected ReflectiveMethodInvocation(
			Object proxy, Object target, Method method, Object[] arguments,
			Class targetClass, List<Object> interceptorsAndDynamicMethodMatchers) {

		this.proxy = proxy;
		this.target = target;
		this.targetClass = targetClass;
		this.method = BridgeMethodResolver.findBridgedMethod(method);
		this.arguments = arguments;
		this.interceptorsAndDynamicMethodMatchers = interceptorsAndDynamicMethodMatchers;
	}
执行拦截链invocation.proceed()
//进入ReflectiveMethodInvocation
public Object proceed() throws Throwable {
		//	We start with an index of -1 and increment early.
		if (this.currentInterceptorIndex == this.interceptorsAndDynamicMethodMatchers.size() - 1) {
			return invokeJoinpoint(); //拦截器走到最后一个进行普通方法反射调用
		}

		Object interceptorOrInterceptionAdvice =
				this.interceptorsAndDynamicMethodMatchers.get(++this.currentInterceptorIndex);//计数累加
		if (interceptorOrInterceptionAdvice instanceof InterceptorAndDynamicMethodMatcher) {
		    ...
		}
		else {
			return ((MethodInterceptor) interceptorOrInterceptionAdvice).invoke(this);
		}
	}
	
	//进入MethodBeforeAdviceInterceptor
	public Object invoke(MethodInvocation mi) throws Throwable {
		this.advice.before(mi.getMethod(), mi.getArguments(), mi.getThis() );
		return mi.proceed();
	}
	
	//终于进入自己实现的GreetingBeforeAdvice了
    public void before(Method method, Object[] args, Object obj) throws Throwable {
            String clientName = (String) args[0];
            System.out.println("How are you！Mr." + clientName + ".");
        }
        
        
        protected Object invokeJoinpoint() throws Throwable {
		return AopUtils.invokeJoinpointUsingReflection(this.target, this.method, this.arguments);
	}
	
	//进入AopUtils
	public static Object invokeJoinpointUsingReflection(Object target, Method method, Object[] args)
			throws Throwable {
			...
			ReflectionUtils.makeAccessible(method);
			return method.invoke(target, args); //执行target方法
	}
ProxyFactory和ProxyFactoryBean的区别
  • ProxyFactoryBean实现了Spring的FactoryBean接口，所以它跟Spring中的其它FactoryBean一样，都是基于工厂模式来获取一个bean的。
  • ProxyFactoryBean就是用来获取一个对象的代理对象的FactoryBean。它也是继承自ProxyCreatorSupport类的，所以它的功能基本跟ProxyFactory差不多
  • 只是ProxyFactory是用于编程式的创建代理对象。而ProxyFactoryBean用于在Spring的bean容器中创建基于bean的代理对象 技术分享图片

网上找的图，虽然丑，但画的非常好，把各个组件的关系描绘的分明

Spring配置
<bean id="forumServiceTarget" class="com.brianway.learning.spring.aop.advice.ForumService"/>
<bean id="transactionManager" class="com.brianway.learning.spring.aop.advice.TransactionManager"/>
<bean id="forumService" class="org.springframework.aop.framework.ProxyFactoryBean"
      p:interceptorNames="transactionManager"
      p:target-ref="forumServiceTarget"
      p:proxyTargetClass="false"/>  <!--需要将ForumService抽成接口，不然会转用cglib-->

//从获取bean开始
ForumServiceInterface forumService = (ForumServiceInterface) context.getBean("forumService"); 

//进入AbstractBeanFactory
public Object getBean(String name) throws BeansException {
		return doGetBean(name, null, null, false);
	}
	
protected <T> T doGetBean(
		final String name, final Class<T> requiredType, final Object[] args, boolean typeCheckOnly)
		throws BeansException {

	final String beanName = transformedBeanName(name);
	Object bean;

	Object sharedInstance = getSingleton(beanName); //获得ProxyFactoryBean
	if (sharedInstance != null && args == null) {
        ...
		bean = getObjectForBeanInstance(sharedInstance, name, beanName, null);
	}
	...
	return (T) bean;
}


protected Object getObjectForBeanInstance(
			Object beanInstance, String name, String beanName, RootBeanDefinition mbd) {
            ...
            
            if (!(beanInstance instanceof FactoryBean) || BeanFactoryUtils.isFactoryDereference(name)) {
			return beanInstance;  //不是factoryBean直接返回
		}
		
	    Object object = null;
		if (mbd == null) {
			object = getCachedObjectForFactoryBean(beanName);//先看缓存
		}
		if (object == null) {
			FactoryBean<?> factory = (FactoryBean<?>) beanInstance;
			// Caches object obtained from FactoryBean if it is a singleton.
			if (mbd == null && containsBeanDefinition(beanName)) {
				mbd = getMergedLocalBeanDefinition(beanName);
			}
			boolean synthetic = (mbd != null && mbd.isSynthetic());
			object = getObjectFromFactoryBean(factory, beanName, !synthetic); //factoryBean获取对象
		}
		return object;
}

protected Object getObjectFromFactoryBean(FactoryBean<?> factory, String beanName, boolean shouldPostProcess) {
        Object object = this.factoryBeanObjectCache.get(beanName);
    	if (object == null) {
    		object = doGetObjectFromFactoryBean(factory, beanName);
    		Object alreadyThere = this.factoryBeanObjectCache.get(beanName); //先从缓存找
    		if (alreadyThere != null) {
    			object = alreadyThere;
    		}
    		else {
    			if (object != null && shouldPostProcess) {
					object = postProcessObjectFromFactoryBean(object, beanName); //后置处理器
    			}
    			this.factoryBeanObjectCache.put(beanName, (object != null ? object : NULL_OBJECT)); //放入缓存
    		}
    	}
    	return (object != NULL_OBJECT ? object : null);
}

private Object doGetObjectFromFactoryBean(final FactoryBean<?> factory, final String beanName)
			throws BeanCreationException {

		Object object;
		...
		object = factory.getObject();
		...
		return object;
	}

ProxyFactoryBean获取对象

public Object getObject() throws BeansException {
		initializeAdvisorChain(); //初始化拦截器链
		if (isSingleton()) {
			return getSingletonInstance();
		}
		else {
			return newPrototypeInstance();
		}
	}
	
	
	private synchronized void initializeAdvisorChain() throws AopConfigException, BeansException {
		if (this.advisorChainInitialized) {
			return;//已经初始化过了直接返回
		}

		if (!ObjectUtils.isEmpty(this.interceptorNames)) {
		    ...
			for (String name : this.interceptorNames) {

				if (name.endsWith(GLOBAL_SUFFIX)) {
				    ...
				}

				else {
					Object advice;
					if (this.singleton || this.beanFactory.isSingleton(name)) {
						advice = this.beanFactory.getBean(name);//从bean获得advice
					}
					else {
						advice = new PrototypePlaceholderAdvisor(name);
					}
					addAdvisorOnChainCreation(advice, name);
				}
			}
		}

		this.advisorChainInitialized = true;
	}
	
	private void addAdvisorOnChainCreation(Object next, String name) {
		Advisor advisor = namedBeanToAdvisor(next); //转换成相应的advisor
		addAdvisor(advisor);
	}
	
	private Advisor namedBeanToAdvisor(Object next) {
		return this.advisorAdapterRegistry.wrap(next);
	}
	
	//进入DefaultAdvisorAdapterRegistry
	public Advisor wrap(Object adviceObject) throws UnknownAdviceTypeException {
		if (adviceObject instanceof Advisor) {
			return (Advisor) adviceObject;
		}
		...
		Advice advice = (Advice) adviceObject;
		if (advice instanceof MethodInterceptor) {
			return new DefaultPointcutAdvisor(advice);
		}
		for (AdvisorAdapter adapter : this.adapters) {
			if (adapter.supportsAdvice(advice)) {
				return new DefaultPointcutAdvisor(advice);
			}
		}
		throw new UnknownAdviceTypeException(advice);
	}
	
	
	private synchronized Object getSingletonInstance() {
		if (this.singletonInstance == null) {
			this.targetSource = freshTargetSource();
			if (this.autodetectInterfaces && getProxiedInterfaces().length == 0 && !isProxyTargetClass()) {
				Class<?> targetClass = getTargetClass();
				setInterfaces(ClassUtils.getAllInterfacesForClass(targetClass, this.proxyClassLoader)); //代理目标类的所有接口
			}
			super.setFrozen(this.freezeProxy);
			this.singletonInstance = getProxy(createAopProxy());
		}
		return this.singletonInstance;
	}
	
	private TargetSource freshTargetSource() {
		if (this.targetName == null) {
			return this.targetSource;
		}
		else {
		...
		}
	}
	
	//进入父类ProxyCreatorSupport，和之前分析一样，就不赘述了
	protected final synchronized AopProxy createAopProxy() {
	    ...
		return getAopProxyFactory().createAopProxy(this);
	}
	
	protected Object getProxy(AopProxy aopProxy) {
		return aopProxy.getProxy(this.proxyClassLoader);
	}
	
	//进入JdkDynamicAopProxy，生成代理对象
	public Object getProxy(ClassLoader classLoader) {
		Class<?>[] proxiedInterfaces = AopProxyUtils.completeProxiedInterfaces(this.advised);
		findDefinedEqualsAndHashCodeMethods(proxiedInterfaces);
		return Proxy.newProxyInstance(classLoader, proxiedInterfaces, this);
	}

aspectj注解的代理

  1. 用户通过配置XML <aop:aspectj-autoproxy>或@EnableAspectJAutoProxy注解来开启AOP自动代理对象，spring IOC容器在启动时会将配置的目标对象bean、切面及相关通知信息，解析成Advisor对象对应的BeanDefintion，并把代理对象的配置信息保存在ProxyConfig对象中。
  2. AbstractAutoProxyCreator继承了ProxyConfig，且实现了SmartInstantiationAwareBeanPostProcessor , BeanFactoryAware接口，这意味着当IOC容器启动时，会创建AbstractAutoProxyCreator对象，实现了BeanFactoryAware意味着，在AbstractAutoProxyCreator实例初始化阶段，BeanFactory自动注入DefaultListableBeanFactory工厂给AbstractAutoProxyCreator实例使用，有BeanFactory对象则可以通过getBean方法来访问容器中所有的通知对象Advisor相关信息.
  3. 每当调用BeanFactory取得bean对象时，利用实现了SmartInstantiationAwareBeanPostProcessor的后置处理器功能，BeanFactory会在多个阶段自动调用AbstractAutoProxyCreator这个后置处理器的实现方法，这些实现方法用来判断该Bean是否需要代理，判断Bean是否需要的代理的依据是根据该bean对象是否在IOC容器中存在匹配的一个或多个通知Advisor对象，存在则需要代理，否则，就放过。

Spring Aop只是借鉴aspectj的定义，提供注解驱动的AOP，本质上还是用的aop的动态代理，这种风格的好处就是不需要使用XML进行配置

参考文档:

ajc环境配置：

编译时织入（Compile Time Weaving, CTW） 载入（Load Time Weaving, LTW）时织入。

只需要配 ajc compiler:aspectjtools.jar，其他不勾选，1.7的aspectjtools，字节码选1.5？ 注意先清空target目录，再全项目编译

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