sprig AOP之ProxyFactory

我们在项目中大多使用的声明式的AOP配置，其实在spring中也提供了编程式的AOP实现方法，具体在ProxyFactory中例如ProxyFactory例子如下：

TargetImpl target = new TargetImpl();

ProxyFactory proxy = new ProxyFactory ();

target.addAdvisor(youAdvisor);

target.addAdvice(youAdvice);

TargetImpl  targetproxy = proxy.getProxy();

proxyFactory类的源码如下：
public class ProxyFactory extends ProxyCreatorSupport
{

    public ProxyFactory()
    {
    }

    public ProxyFactory(Object target)
    {
        Assert.notNull(target, "Target object must not be null");
        setInterfaces(ClassUtils.getAllInterfaces(target));
        setTarget(target);
    }

    public ProxyFactory(Class proxyInterfaces[])
    {
        setInterfaces(proxyInterfaces);
    }

    public ProxyFactory(Class proxyInterface, Interceptor interceptor)
    {
        addInterface(proxyInterface);
        addAdvice(interceptor);
    }

    public ProxyFactory(Class proxyInterface, TargetSource targetSource)
    {
        addInterface(proxyInterface);
        setTargetSource(targetSource);
    }

    public Object getProxy()
    {
        return createAopProxy().getProxy();
    }

    public Object getProxy(ClassLoader classLoader)
    {
        return createAopProxy().getProxy(classLoader);
    }

    public static Object getProxy(Class proxyInterface, Interceptor interceptor)
    {
        return (new ProxyFactory(proxyInterface, interceptor)).getProxy();
    }

    public static Object getProxy(Class proxyInterface, TargetSource targetSource)
    {
        return (new ProxyFactory(proxyInterface, targetSource)).getProxy();
    }

    public static Object getProxy(TargetSource targetSource)
    {
        if(targetSource.getTargetClass() == null)
        {
            throw new IllegalArgumentException("Cannot create class proxy for TargetSource with null target class");
        } else
        {
            ProxyFactory proxyFactory = new ProxyFactory();
            proxyFactory.setTargetSource(targetSource);
            proxyFactory.setProxyTargetClass(true);
            return proxyFactory.getProxy();
        }
    }
}
proxyFactory的实现原理与ProxyFactoryBean的实现原理是一样的，只是在最外层的表示形式有所不同，proxyFactory没有使用proxyFactoryBean的IoC封装，而是通过直接继承ProxyCreatorSupport的功能来完成AOP的属性配置。

具体实例
/**
* 具体的拦截器类
*/
public class TestInterceptor implements MethodInterceptor
{
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable
    {
        System.out.print("zhangsan start.....");
        Object retVal = invocation.proceed();
        System.out.print("end");
        return retVal;
    }

}

//具体业务类
public class Loginservice
{
   public void login()
   {
       System.out.println("this is login method");
   }
}

//测试类
public class Test
{
    public static void main(String[] args)
    {
        //具体的业务逻辑
        Loginservice loginservice = new Loginservice();
        //代理工厂
        ProxyFactory pf = new ProxyFactory(loginservice);
        //添加advice
        pf.addAdvice(new TestInterceptor());
        //产生代理对象
        Loginservice lg = (Loginservice) pf.getProxy();
        lg.login();
    }
}

这只是简单的通过编码完成了spring的AOP功能。