Spring AOP系列之二：Java代理

通过Java代理的方式：

汽车的代理，需要实现 java.lang.reflect.InvocationHandler接口

public class CarJavaProxy implements InvocationHandler {
	private Object car;

	public void setCar(Object car) {
		this.car = car;
	}

	public Object createProxy() {
		Object proxy = Proxy.newProxyInstance(car.getClass().getClassLoader(), car.getClass().getInterfaces(), this);
		return proxy;
	}

	@Override
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		Object result = method.invoke(car, args);
		if ("info".equalsIgnoreCase(method.getName())) {
			System.out.println("Give 200 maintenance coupon via Java proxy");
		}
		return result;
	}
}

Spring配置文件beans-java-proxy.xml：

<?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="carJavaProxy" class="com.john.spring.aop.CarJavaProxy">
  	<property name="car" ref="car" />
  </bean>
</beans>

测试：

public static void main(String[] args) {
	ApplicationContext ctx = new ClassPathXmlApplicationContext(new String[] { "beans-java-proxy.xml" });
	CarJavaProxy carProxy = (CarJavaProxy) ctx.getBean("carJavaProxy");
	Vehicle vehicle = (Vehicle) carProxy.createProxy();
	vehicle.info();
}

输出：
Car name: Superb, price: 220000
Give 200 maintenance coupon via Java proxy