(二)Spring AOP的实现-ProxyFactory实现AOP

1.我们还可以使用ProxyFactory实现Spring AOP的功能，只是在使用ProxyFactory的时候，需要编程式的完成AOP应用的设置。

TargetImpl target = new TargetImple();

ProxyFactory aopFactory = new ProxyFactory(target);

aopFactory.addAdvisor(yourAdvisor);

aopFactory.addAdvice(yourAdvice);

TargetImpl targetProxy = (TargetImpl)aopFactory.getProxy();

2.对于ProxyFactory实现AOP功能，其实现原理与ProxyFactoryBean的实现原理是一样的，只是在最外层的表现形式有所不同。

public class ProxyFactory extends ProxyCreatorSupport {

/**
* Create a new ProxyFactory.
*/
public ProxyFactory() {
}

/**
* Create a new ProxyFactory.
* <p>Will proxy all interfaces that the given target implements.
* @param target the target object to be proxied
*/
public ProxyFactory(Object target) {
setTarget(target);
setInterfaces(ClassUtils.getAllInterfaces(target));
}

/**
* Create a new ProxyFactory.
* <p>No target, only interfaces. Must add interceptors.
* @param proxyInterfaces the interfaces that the proxy should implement
*/
public ProxyFactory(Class<?>... proxyInterfaces) {
setInterfaces(proxyInterfaces);
}

/**
* Create a new ProxyFactory for the given interface and interceptor.
* <p>Convenience method for creating a proxy for a single interceptor,
* assuming that the interceptor handles all calls itself rather than
* delegating to a target, like in the case of remoting proxies.
* @param proxyInterface the interface that the proxy should implement
* @param interceptor the interceptor that the proxy should invoke
*/
public ProxyFactory(Class<?> proxyInterface, Interceptor interceptor) {
addInterface(proxyInterface);
addAdvice(interceptor);
}

/**
* Create a ProxyFactory for the specified {@code TargetSource},
* making the proxy implement the specified interface.
* @param proxyInterface the interface that the proxy should implement
* @param targetSource the TargetSource that the proxy should invoke
*/
public ProxyFactory(Class<?> proxyInterface, TargetSource targetSource) {
addInterface(proxyInterface);
setTargetSource(targetSource);
}

/**
* Create a new proxy according to the settings in this factory.
* <p>Can be called repeatedly. Effect will vary if we've added
* or removed interfaces. Can add and remove interceptors.
* <p>Uses a default class loader: Usually, the thread context class loader
* (if necessary for proxy creation).
* @return the proxy object
*/
public Object getProxy() {
return createAopProxy().getProxy();
}

/**
* Create a new proxy according to the settings in this factory.
* <p>Can be called repeatedly. Effect will vary if we've added
* or removed interfaces. Can add and remove interceptors.
* <p>Uses the given class loader (if necessary for proxy creation).
* @param classLoader the class loader to create the proxy with
* (or {@code null} for the low-level proxy facility's default)
* @return the proxy object
*/
public Object getProxy(ClassLoader classLoader) {
return createAopProxy().getProxy(classLoader);
}

/**
* Create a new proxy for the given interface and interceptor.
* <p>Convenience method for creating a proxy for a single interceptor,
* assuming that the interceptor handles all calls itself rather than
* delegating to a target, like in the case of remoting proxies.
* @param proxyInterface the interface that the proxy should implement
* @param interceptor the interceptor that the proxy should invoke
* @return the proxy object
* @see #ProxyFactory(Class, org.aopalliance.intercept.Interceptor)
*/
@SuppressWarnings("unchecked")
public static <T> T getProxy(Class<T> proxyInterface, Interceptor interceptor) {
return (T) new ProxyFactory(proxyInterface, interceptor).getProxy();

}

/**
* Create a proxy for the specified {@code TargetSource},
* implementing the specified interface.
* @param proxyInterface the interface that the proxy should implement
* @param targetSource the TargetSource that the proxy should invoke
* @return the proxy object
* @see #ProxyFactory(Class, org.springframework.aop.TargetSource)
*/
@SuppressWarnings("unchecked")
public static <T> T getProxy(Class<T> proxyInterface, TargetSource targetSource) {
return (T) new ProxyFactory(proxyInterface, targetSource).getProxy();
}

/**
* Create a proxy for the specified {@code TargetSource} that extends
* the target class of the {@code TargetSource}.
* @param targetSource the TargetSource that the proxy should invoke
* @return the proxy object
*/
public static Object getProxy(TargetSource targetSource) {
if (targetSource.getTargetClass() == null) {
throw new IllegalArgumentException("Cannot create class proxy for TargetSource with null target class");
}
ProxyFactory proxyFactory = new ProxyFactory();
proxyFactory.setTargetSource(targetSource);
proxyFactory.setProxyTargetClass(true);
return proxyFactory.getProxy();
}
}