黑马程序员——用动态生成类实现类似于spring的可配置的AOP框架

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代码演示：

//框架测试类

package com.itheima.aopframework;

import java.io.InputStream;

public class AopFrameworkTest {

	public static void main(String[] args)throws Exception{
		// TODO Auto-generated method stub
		InputStream is = AopFrameworkTest.class.getResourceAsStream("config.properies");
		
		Object obj = new BeanFactory(is).getBean("xxx");
		
		System.out.println(obj.getClass().getName());
		
	}

}

//判断是否是 ProxyFactroyBean类

package com.itheima.aopframework;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import com.itheima.Adivce;

public class BeanFactory {
	Properties property = new Properties();
	
	public BeanFactory(InputStream is){
		try {
			property.load(is);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public Object getBean(String name){
		String className = property.getProperty(name);
		
		//通过反射创建类
		Object bean = null;
		try {
			Class clazz = Class.forName(className);
			bean = clazz.newInstance();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
		
		//判断是否是 ProxyFactroyBean类
		if(bean instanceof ProxyFactoryBean){
			Object proxy = null;
			ProxyFactoryBean proxyFactoryBean = (ProxyFactoryBean)bean;
			
			try {
				Adivce adivce = (Adivce)Class.forName(property.getProperty(name + ".adivce")).newInstance();
				Object target = Class.forName(property.getProperty(name + ".target")).newInstance();
				proxyFactoryBean.setAdivce(adivce);
				proxyFactoryBean.setTarget(target);
				proxy = proxyFactoryBean.getProxy();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}	
			return proxy;
		}
		return bean;
	}
}

//通过代理动态生成类

package com.itheima.aopframework;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import com.itheima.Adivce;

public class ProxyFactoryBean {
	private Adivce adivce;
	public Adivce getAdivce() {
		return adivce;
	}

	public void setAdivce(Adivce adivce) {
		this.adivce = adivce;
	}

	public Object getTarget() {
		return target;
	}

	public void setTarget(Object target) {
		this.target = target;
	}

	private Object target;

	public Object getProxy() {
		Object proxy2 = (Object)Proxy.newProxyInstance(
				target.getClass().getClassLoader(),
			    target.getClass().getInterfaces(),
			    new InvocationHandler() {	
					@Override
					public Object invoke(Object proxy, Method method, Object[] args)
							throws Throwable {
						adivce.startTime(method);
						
						Object obj = method.invoke(target, args);
						
						adivce.endTime(method);
						return obj;
					}
			});
		return proxy2;
	}

}

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