spring动态代理
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package cn.itcast.day3;import java.lang.reflect.Method;public interface Advice {void beforeMethod(Method method);void afterMethod(Method method);}package cn.itcast.day3;import java.lang.reflect.Method;public class MyAdvice implements Advice {long beginTime = 0;public void afterMethod(Method method) {// TODO Auto-generated method stubSystem.out.println("从传智播客毕业上班啦！");long endTime = System.currentTimeMillis();System.out.println(method.getName() + " running time of " + (endTime - beginTime));}public void beforeMethod(Method method) {// TODO Auto-generated method stubSystem.out.println("到传智播客来学习啦！");beginTime = System.currentTimeMillis();}}package cn.itcast.day3;import java.lang.reflect.Constructor;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;import java.util.ArrayList;import java.util.Collection;public class ProxyTest {/** * @param args */@SuppressWarnings("unchecked")public static void main(String[] args) {//Class clazzProxy1 = Proxy.getProxyClass(Collection.class.getClassLoader(), Collection.class);//System.out.println(clazzProxy1.getName());////System.out.println("----------begin constructors list----------");///*$Proxy0()//$Proxy0(InvocationHandler,int)*///Constructor[] constructors = clazzProxy1.getConstructors();//for(Constructor constructor : constructors){//String name = constructor.getName();//StringBuilder sBuilder = new StringBuilder(name);//sBuilder.append('(');//Class[] clazzParams = constructor.getParameterTypes();//for(Class clazzParam : clazzParams){//sBuilder.append(clazzParam.getName()).append(',');//}//if(clazzParams!=null && clazzParams.length != 0)//sBuilder.deleteCharAt(sBuilder.length()-1);//sBuilder.append(')');//System.out.println(sBuilder.toString());//}////System.out.println("----------begin methods list----------");///*$Proxy0()//$Proxy0(InvocationHandler,int)*///Method[] methods = clazzProxy1.getMethods();//for(Method method : methods){//String name = method.getName();//StringBuilder sBuilder = new StringBuilder(name);//sBuilder.append('(');//Class[] clazzParams = method.getParameterTypes();//for(Class clazzParam : clazzParams){//sBuilder.append(clazzParam.getName()).append(',');//}//if(clazzParams!=null && clazzParams.length != 0)//sBuilder.deleteCharAt(sBuilder.length()-1);//sBuilder.append(')');//System.out.println(sBuilder.toString());//}////System.out.println("----------begin create instance object----------");////Object obj = clazzProxy1.newInstance();//Constructor constructor = clazzProxy1.getConstructor(InvocationHandler.class);//class MyInvocationHander1 implements InvocationHandler{////public Object invoke(Object proxy, Method method, Object[] args)//throws Throwable {//// TODO Auto-generated method stub//return null;//}////}//Collection proxy1 = (Collection)constructor.newInstance(new MyInvocationHander1());////System.out.println(proxy1);//proxy1.clear();////proxy1.size();////System.out.println("111111111111111");////Collection proxy2 = (Collection)constructor.newInstance(new InvocationHandler(){////public Object invoke(Object proxy, Method method, Object[] args)//throws Throwable {//return null;//}////}); //动态代理final ArrayList target = new ArrayList();Collection proxy3 = (Collection)getProxy(target,new MyAdvice());proxy3.add("zxx");proxy3.add("lhm");proxy3.add("bxd");//System.out.println(proxy3.size());//System.out.println(proxy3.getClass().getName()); }//把目标抽取成参数private static Object getProxy(final Object target,final Advice advice) {Object proxy3 = Proxy.newProxyInstance(target.getClass().getClassLoader(),/*new Class[]{Collection.class},*/target.getClass().getInterfaces(),new InvocationHandler(){public Object invoke(Object proxy, Method method, Object[] args)throws Throwable {advice.beforeMethod(method);Object retVal = method.invoke(target, args);advice.afterMethod(method);return retVal;}});return proxy3;}}