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