传智播客Spring视频教程学习笔记16

使用CGLIB实现AOP功能与AOP概念解释

前面的proxy技术必须在类实现了接口的前提下才可以实现权限的控制，cglb可以在类不实现接口的情况下完成。

在spring文件夹下lib/cglib下找到cglib的jar库文件，加入工程。

CGlibProxyFactory.java

package cn.pf.aop;

import java.lang.reflect.Method;

import cn.pf.aop.service.impl.PersonServiceBean;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class CGlibProxyFactory implements MethodInterceptor{
private Object targetObject;

public Object createProxyIntance(Object targetObject){
this.targetObject = targetObject;
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(this.targetObject.getClass());
enhancer.setCallback(this);
return enhancer.create();
}

@Override
public Object intercept(Object proxy, Method method, Object[] arg2,
MethodProxy arg3) throws Throwable {
PersonServiceBean personServiceBean = (PersonServiceBean)targetObject;
Object result = null;
if(personServiceBean.getUser() != null){
result = method.invoke(targetObject, arg2);
}
return result;
}
}

AOPTest.java

@Test public void proxyTest2(){
CGlibProxyFactory factory = new CGlibProxyFactory();
PersonServiceBean personServiceBean = (PersonServiceBean) factory.createProxyIntance(new PersonServiceBean("1"));
personServiceBean.save("111");
}

CGlib的enhance继承了目标类所有非final方法，对这些方法进行覆盖。创建的代理对象是目标对象的子类