java 基础加强

package cn.com; 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 { public static void main(String args[]) throws Exception{ Class clazzProxy = Proxy.getProxyClass(Collection.class.getClassLoader(), Collection.class); System.out.println(clazzProxy.getName()); System.out.println("-----begin constuctor------"); Constructor[] constraints = clazzProxy.getConstructors(); for(Constructor constructor : constraints){ String name = constructor.getName(); StringBuffer sBuffer = new StringBuffer(name); sBuffer.append("("); Class[] classParams = constructor.getParameterTypes(); for(Class classparam : classParams){ sBuffer.append(classparam.getName()+" "+ classparam.getName().substring(classparam.getName().lastIndexOf(".")+1, classparam.getName().length()).toString().toLowerCase()).append(','); } if(classParams.length>0){ sBuffer.deleteCharAt(sBuffer.length()-1); } sBuffer.append(")"); System.out.println(sBuffer); } System.out.println("-----begin method------"); Method[] methods = clazzProxy.getMethods(); for(Method method : methods){ String name = method.getName(); StringBuffer sBuffer = new StringBuffer(name); sBuffer.append("("); Class[] classParams = method.getParameterTypes(); for(Class classparam : classParams){ sBuffer.append(classparam.getName()+" "+ classparam.getName().substring(classparam.getName().lastIndexOf(".")+1, classparam.getName().length()).toString().toLowerCase()).append(','); } if(classParams.length>0){ sBuffer.deleteCharAt(sBuffer.length()-1); } sBuffer.append(")"); System.out.println(sBuffer); } System.out.println("-----begin create instance------"); Constructor constructor = clazzProxy.getConstructor(InvocationHandler.class); class MyInvocationHander implements InvocationHandler{ @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { return null; } } Collection proxy1 = (Collection)constructor.newInstance(new MyInvocationHander()); proxy1.clear(); Collection proxy2 = (Collection)constructor.newInstance(new InvocationHandler(){ @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { return null; } }); final ArrayList target = new ArrayList(); Collection proxy3 = (Collection) getProxy(target,new MyAdvice()); proxy3.add("abc"); proxy3.add("xyz"); System.out.println(proxy3.size()); } 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 { /*long starttime = System.currentTimeMillis(); Object retVal = method.invoke(target, args); long endtime = System.currentTimeMillis(); System.out.println(method + " 发费时间：" + (endtime - starttime)); return retVal;*/ advice.beforeMethod(); Object retVal = method.invoke(target, args); advice.afterMethod(method); return retVal; } }); return proxy3; } }