【实现AOP功能的封装与配置】

本文介绍了一种使用Java实现AOP(面向切面编程)的方法。通过自定义工厂类BeanFactory来创建目标类或代理类的实例。当配置文件指定类名为ProxyFactoryBean时,会创建一个代理类,该代理类在调用目标方法前后可以执行额外的操作。

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工厂类BeanFactory负责创建目标类或代理类的实例对象,并通过配置文件实现切换。其getBean方法根据参数字符串返回一个相应的实例对象,如果参数字符串在配置文件中对应的类名不是ProxyFactoryBean,则直接返回该类的实例对象,否则,返回ProxyFactoryBean对象的getProxy方法返回的代理类。

AopFrameworkTest.java

package com.xiaozhi.proxy;


import java.io.InputStream;
import java.util.Collection;

public class AopFrameworkTest {

	public static void main(String[] args) throws Exception {
		InputStream ips = AopFrameworkTest.class.getResourceAsStream("config.properties");
		Object bean = new BeanFactory(ips).getBean("xxx");
		System.out.println(bean.getClass().getName());
		((Collection)bean).clear();
	}

}


config.properties

#xxx=java.util.ArrayList
xxx=com.xiaozhi.proxy.ProxyFactoryBean
xxx.advice=com.xiaozhi.proxy.MyAdvice
xxx.target=java.util.ArrayList

BeanFactory.java

package com.xiaozhi.proxy;


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

public class BeanFactory {
	Properties props = new Properties();
	public BeanFactory(InputStream ips){
		try {
			props.load(ips);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public Object getBean(String name){
		String className = props.getProperty(name);
		Object bean = null;
		try {
			Class clazz = Class.forName(className);
			bean = clazz.newInstance();
		} catch (Exception e) {
			e.printStackTrace();
		} 
		if(bean instanceof ProxyFactoryBean){
			Object proxy = null;
			ProxyFactoryBean proxyFactoryBean = (ProxyFactoryBean)bean;
			try {
				Advice advice = (Advice)Class.forName(props.getProperty(name + ".advice")).newInstance();
				Object target = Class.forName(props.getProperty(name + ".target")).newInstance();
				proxyFactoryBean.setAdvice(advice);
				proxyFactoryBean.setTarget(target);
				proxy = proxyFactoryBean.getProxy();
			} catch (Exception e) {
				e.printStackTrace();
			}
			return proxy;
		}
		return bean;
	}
}
ProxyFactoryBean.java

package com.xiaozhi.proxy;


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

public class ProxyFactoryBean {

	private Advice advice;
	private Object target;
	
	public Advice getAdvice() {
		return advice;
	}

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

	public Object getTarget() {
		return target;
	}

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

	public  Object getProxy() {
		return  Proxy.newProxyInstance(
				target.getClass().getClassLoader(),
				target.getClass().getInterfaces(), 
		new InvocationHandler() {
			@Override
			public Object invoke(Object proxy, Method method, Object[] args)throws Throwable 
			{
				advice.beforeMehotd();
				System.out.println(method.getName());
				Object object=method.invoke(target, args);
				advice.afterMehotd();
				return object;
			}
		});
	}

}




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