AOP执行流程与机制

一、CgLib实现动态代理的例子

1、创建Person类

package com.example.cglib;


public class Person {
	
	public void study(){
		System.out.println("study");
	}

}

　　

2、创建CgLibProxy 类

package com.example.cglib;

import java.lang.reflect.Method;

import org.springframework.cglib.proxy.Enhancer;
import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;



public class CgLibProxy implements MethodInterceptor {

	private Enhancer enhancer = new Enhancer();
	
	public Object getProxy(Class<?> clazz){
		enhancer.setSuperclass(clazz);
		enhancer.setCallback(this);
		
		Object object = enhancer.create();
		
		return object;
		
	}

	@Override
	public Object intercept(Object arg0, Method arg1, Object[] arg2, MethodProxy arg3) throws Throwable {
		System.out.println(arg0.getClass().getName() +"." + arg1.getName());
		
		//执行父类（目标对象Person）的对应方法
		Object result = arg3.invokeSuper(arg0, arg2);
		System.out.println("执行结束");
		return result;
	}
	
	public static void main(String[] args) {
		CgLibProxy proxy = new CgLibProxy();
		
	
		Person person = (Person)proxy.getProxy(Person.class);
		
		System.out.println(person.getClass().getName());
		
		//打印person父类的名字
		System.out.println(person.getClass().getSuperclass().getName());
		
		person.study();
	}

}

　　

 

输出结果：

 

 

Cglib通过子类实现父类的方法实现AOP