在Spring中，ProxyFactory和ProxyFactoryBean有什么区别？

Question

我有以下示例代码：

MyMethodBeforeAdviceImpl.java

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

public class MyMethodBeforeAdviceImpl implements MethodBeforeAdvice {
    @Override
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println("MyMethodBeforeAdviceImpl#before");
    }
}

MyService.java

public interface MyService {
    void serve();
}

MyServiceImpl.java

public class MyServiceImpl implements MyService {
    @Override
    public void serve() {
        System.out.println("MyServiceImpl#serve");
    }
}

最后是App.java

import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.framework.ProxyFactoryBean;

public class App {
    public static void main(String[] args) {
        final MyServiceImpl myService = new MyServiceImpl();
        final MethodBeforeAdvice myMethodBeforeAdvice = new MyMethodBeforeAdviceImpl();

        final ProxyFactory proxyFactory = new ProxyFactory();
        proxyFactory.addAdvice(myMethodBeforeAdvice);
        proxyFactory.setTarget(myService);

        MyService proxyServiceFromFactory = (MyService) proxyFactory.getProxy();
        proxyServiceFromFactory.serve();

        final ProxyFactoryBean proxyFactoryBean = new ProxyFactoryBean();
        proxyFactoryBean.addAdvice(myMethodBeforeAdvice);
        proxyFactoryBean.setTarget(myService);

        MyService proxyServiceFromFactoryBean = (MyService) proxyFactoryBean.getObject();
        proxyServiceFromFactoryBean.serve();

        System.exit(-1);
    }
}

主要方法的输出如下：

MyMethodBeforeAdviceImpl#before
MyServiceImpl#serve
MyMethodBeforeAdviceImpl#before
MyServiceImpl#serve

因此，就这个非常小的例子而言，它们的作用完全相同。ProxyFactory文档指出：

用于编程使用的AOP代理工厂，而不是通过bean工厂中的声明性设置。该类提供了一种在自定义用户代码中获取和配置AOP代理实例的简单方法。

但在我看来，你还是为了同样的目的而使用ProxyFactoryBean吧？

这两个类是如何达到不同目的的？

Answer 1

ProxyFactory独立于Spring的IoC容器。ProxyFactoryBean正在将Spring与Spring的IoC容器结合起来。