Spring视频学习（六）JDK和cglib实现AOP

package cn.itcast.aop;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import cn.itcast.service.impl.PersonServiceBean;

public class JDKProxyFactory implements InvocationHandler{
private Object targetObject;

public Object createProxyIntance(Object targetObject){
this.targetObject = targetObject;
return Proxy.newProxyInstance(this.targetObject.getClass().getClassLoader(),
this.targetObject.getClass().getInterfaces(), this);
}

public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {//环绕通知
PersonServiceBean bean = (PersonServiceBean) this.targetObject;
Object result = null;
if(bean.getUser()!=null){
//..... advice()-->前置通知
System.out.println("before");
try {
result = method.invoke(targetObject, args);
// afteradvice() -->后置通知
System.out.println("after");
} catch (RuntimeException e) {
//exceptionadvice()--> 例外通知
}finally{
//finallyadvice(); -->最终通知
}
}else{
System.out.println("无权调用");
}
return result;
}

}

package cn.itcast.aop;

import java.lang.reflect.Method;

import cn.itcast.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());//非final
enhancer.setCallback(this);
return enhancer.create();
}

public Object intercept(Object proxy, Method method, Object[] args,
MethodProxy  methodProxy) throws Throwable {
PersonServiceBean bean = (PersonServiceBean) this.targetObject;
Object result = null;
if(bean.getUser()!=null){
result = methodProxy.invoke(targetObject, args);
}
return result;
}
}

package junit.test;

import org.junit.BeforeClass;
import org.junit.Test;

import cn.itcast.aop.CGlibProxyFactory;
import cn.itcast.aop.JDKProxyFactory;
import cn.itcast.service.PersonService;
import cn.itcast.service.impl.PersonServiceBean;

public class AOPTest {

@BeforeClass
public static void setUpBeforeClass() throws Exception {
}

@Test public void proxyTest(){
JDKProxyFactory factory = new JDKProxyFactory();
PersonService service = (PersonService) factory.createProxyIntance(new PersonServiceBean());
service.save("888");
}

@Test public void proxyTest2(){
CGlibProxyFactory factory = new CGlibProxyFactory();
PersonServiceBean service = (PersonServiceBean) factory.createProxyIntance(new PersonServiceBean("xxx"));
service.save("999");
}
}