IoC与AOP的那点事儿

public class Person {

	// 由Person自己管理Food类的创建
	public void eat() {
		Food food = new Chicken();
		System.out.println("I am eating " + food.getName() + "...");
	}

}

public class Person {
	private Food food;

	// 通过set注入
	public void setFood(Food food) {
		this.food = food;
	}

	// Person不需要关注Food,只管使用即可
	public void eat() {
		System.out.println("I am eating " + this.food.getName() + "...");
	}

}

public class A {

	public void something () {
		// 业务逻辑...
		recordLog();	
	}

	private void recordLog() {
		// 记录日志...
	}

}

public class B {

	public void something () {
		// 业务逻辑...
		recordLog();
	}

	private void recordLog() {
		// 记录日志...
	}

}

public class A {

	public void something () {
		// 业务逻辑...
		Report.recordLog();
	}

}

public class B {

	public void something () {
		// 业务逻辑...
		Report.recordLog();
	}

}

public class Report {

	public static void recordLog (String ...messages) {
		// 记录日志...
	}

}

public class Something {

    public void say() {
        System.out.println("Say something...");
    }

    public static void main(String[] args) {
        Something something = new Something();
        something.say();
    }

}

public aspect SomethingAspect {

    /**
     * 切入点,切入到Something.say()
     */
    pointcut recordLog():call(* com.sun.sylvanas.application.hello_aop.Something.say(..));

    /**
     * 在方法执行后执行
     */
    after():recordLog() {
        System.out.println("[AFTER] Record log...");
    }

}