分享：AOP小例子，终于搞出来了 - 黑马程序员技术交流社区

import java.io.*;
import java.util.Properties;
public class BeanFactory {
//配置文件存储对象
Properties props = new Properties();
public BeanFactory(InputStream ips){
try {
props.load(ips);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//getBean方法
public Object getBean(String name) throws Exception {
//从配置文件获取要创建的Bean名
String className = props.getProperty(name);
Object bean = null;
try {
//根据className得到相应的class对象
Class clazz = Class.forName(className);
//对象实例化
bean = clazz.newInstance();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//判断如果传入的bean为ProxyFactoryBean的实例化对象，则创建代理进行处理，否则返回bean
if(bean instanceof ProxyFactoryBean){
ProxyFactoryBean proxyFactoryBean = (ProxyFactoryBean)bean;
//通过配置文件获得Advice实例对象、target对象
Advice advice = (Advice) Class.forName(props.getProperty(name + ".advice")).newInstance();
Object target = Class.forName(props.getProperty(name + ".target")).newInstance();
//赋值
proxyFactoryBean.setAdvice(advice);
proxyFactoryBean.setTarget(target);
Object proxy = proxyFactoryBean.getProxy(proxyFactoryBean,advice);
return proxy;
}
return bean;
}
}
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;
}
//获得Proxy对象
public Object getProxy(final Object target,final Advice advice) {
//传递三个参数创建一个proxy对象
Object proxy1 = Proxy.newProxyInstance(
target.getClass().getClassLoader(),
target.getClass().getInterfaces(),
new InvocationHandler(){
@Override
public Object invoke(Object proxy, Method method,
Object[] args) throws Throwable {
advice.beforeMethod(method);
Object retValue = method.invoke(target, args);
advice.afterMethod(method);
return retValue;
}
}
);
return proxy1;
}
}

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