【实现AOP功能的封装与配置】

来源：互联网发布：淘宝买家怎么盖楼编辑：程序博客网时间：2024/06/05 07:13

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.ArrayListxxx=com.xiaozhi.proxy.ProxyFactoryBeanxxx.advice=com.xiaozhi.proxy.MyAdvicexxx.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() {@Overridepublic 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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