Spring AOP系列之一：手动方式

    AOP (Aspect Oriented Programming)面向切面编程，是对OOP (Object Oriented Programming)面向对象编程很好的补充，可以在不改变原始目标原型的情况下，动态地添加通用逻辑，完成业务逻辑和通用处理分离，实现解耦和利于扩展。

首先看下手动方式，没有使用AOP代理：

车辆接口：

public interface Vehicle {
	void info();
}

汽车类：

public class Car implements Vehicle {
	private String name;
	private String price;

	public void setName(String name) {
		this.name = name;
	}

	public void setPrice(String price) {
		this.price = price;
	}

	@Override
	public void info() {
		System.out.println("Car name: " + name + ", price: " + price);
	}
}

代理类：

public class CarManualProxy {
	private Car car;

	public void setCar(Car car) {
		this.car = car;
	}
	
	public void sell() {
		car.info();
		System.out.println("Give 200 maintenance coupon via manual way");
	}
}

Spring配置文件beans-manual-proxy.xml，放在类路径下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"
  default-autowire="byName">

  <bean id="car" class="com.john.spring.aop.Car">
  	<property name="name" value="Superb" />
	<property name="price" value="220000" />
  </bean>
  
  <bean id="carManualProxy" class="com.john.spring.aop.CarManualProxy">
  	<property name="car" ref="car" />
  </bean>
</beans>

测试：

public static void main(String[] args) {
	ApplicationContext ctx = new ClassPathXmlApplicationContext(new String[] { "beans-manual-proxy.xml" });
	CarManualProxy carProxy = (CarManualProxy) ctx.getBean("carManualProxy");
	carProxy.sell();
}

输出：
Car name: Superb, price: 220000
Give 200 maintenance coupon via manual way