Spring.AOP下的 hello world !

package com.test532;

public class MessageWriter {
public void writeMessage(){
System.out.print("World");
}
}

package com.test532;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

//此类实现包围通知  MethodInterceptor
public class MethodDecorator implements MethodInterceptor{

@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
System.out.print("Hello ");
Object retVal = invocation.proceed();
System.out.print(" !");
return retVal;
}
}

public class HelloWorldWriter {
public static void main(String[] args) {
MessageWriter writer = new MessageWriter();
//使用ProxyFactory是完全编程式的做法，一般我们不需要这么做，
//可以依靠ProxyFactoryBean类来声明式地创建代理
ProxyFactory factory = new ProxyFactory();//创建代理工厂
factory.addAdvice(new MethodDecorator());//织入通知
factory.setTarget(writer);//设定织入的目标对象
MessageWriter proxy = (MessageWriter)factory.getProxy(); //获得代理
proxy.writeMessage();
}
}

Hello World !