Spring的AOP原理（CGLib动态代理）

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本文链接： https://blog.csdn.net/shunli008/article/details/99349532

ProductDao 类

package com.shunli.ioc.demo5;

public class ProductDao {

	public void save() {
		System.out.println("save........");
	}

	public void update() {
		System.out.println("update........");
	}

	public void find() {
		System.out.println("find........");
	}

	public void delete() {
		System.out.println("delete........");
	}
}

MyCglibProxy

package com.shunli.ioc.demo5;

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 MyCglibProxy implements MethodInterceptor{
	
	private ProductDao productDao;
	
	public MyCglibProxy(ProductDao productDao) {
		this.productDao = productDao;
		
	}
	
	public Object CreateProxy() {
		//1、创建核心类
		Enhancer enchEnhancer = new Enhancer();
		//2、设置父类
		enchEnhancer.setSuperclass(productDao.getClass());
		//3、设置回调
		enchEnhancer.setCallback(this);
		//4、生成代理
		Object proxy = enchEnhancer.create();
		return proxy;
	}

	@Override
	public Object intercept(Object arg0, Method arg1, Object[] arg2, MethodProxy arg3) throws Throwable {
		
		if("update".equals(arg1.getName())) {
			System.out.println("调用update前调用此方法");
		}
		return arg3.invokeSuper(arg0, arg2);
	}
}

dmeo

package com.shunli.ioc.demo5;

import org.junit.Test;

public class Demo {

	@Test
	public void demo2() {
		
		ProductDao productDao = new ProductDao();
		
		ProductDao proxy = (ProductDao)new MyCglibProxy(productDao).CreateProxy();
		
		proxy.save();
		proxy.update();
		proxy.find();
		proxy.delete();
	}
}

输出