public class SimpleStaticProxy {//服务接口static interface IService {void sayHello();}//服务类static class RealService implements IService {@Overridepublic void sayHello() {System.out.println("hi");}}//代理类static class TraceProxy implements IService {private IService realService;public TraceProxy(IService realService) {this.realService = realService;}@Overridepublic void sayHello() {System.out.println("Start say hi");realService.sayHello();System.out.println("End say hi");}}public static void main(String[] args) {RealService service = new RealService();TraceProxy traceProxy = new TraceProxy(service);traceProxy.sayHello();}
}

public class SimpleJDKDynamicProxy {interface IService {void sayHello();void sayGoodBye();}static class RealService implements IService {@Overridepublic void sayHello() {System.out.println("hi");}@Overridepublic void sayGoodBye() {System.out.println("GoodBye world!");}}static class SimpleInvocateHandler implements InvocationHandler {private Object realObj;public SimpleInvocateHandler(Object realObj) {this.realObj = realObj;}/*** @param proxy 表示代理对象本身，注意它不是被代理的对象，这个参数用处不大* @param method 表示正在被调用的方法* @param args 表示方法的参数* */@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {System.out.println("Start " + method.getName());Object result = method.invoke(realObj, args);System.out.println("End " + method.getName());return result;}}public static void main(String[] args) {IService realService = new RealService();IService proxyService = (IService) Proxy.newProxyInstance(IService.class.getClassLoader(),new Class<?>[]{IService.class}, new SimpleInvocateHandler(realService));proxyService.sayHello();proxyService.sayGoodBye();}
}

/*** @param loader 类加载器* @param interfaces 代理类要实现的接口列表* @param h 该接口定义了invoke方法，对代理接口所有的方法调用都会转给该方法* @return 可以转换为interfaces数组中的某个接口类型，注意只能转换为接口不能转换为具体的类* */public static Object newProxyInstance(ClassLoader loader,Class<?>[] interfaces, InvocationHandler h);

//创建代理类定义，类定义会被缓存
Class<?> proxyCls = Proxy.getProxyClass(IService.class.getClassLoader(), new Class<?>[] { IService.class });
//获取代理类的构造方法
Constructor<?> ctor = proxyCls.getConstructor(new Class<?>[] { InvocationHandler.class });
InvocationHandler handler = new SimpleInvocationHandler(realService);
//创建代理类对象
IService proxyService = (IService) ctor.newInstance(handler);

    final class $Proxy0 extends Proxy implements SimpleJDKDynamicProxyDemo.IService {private static Method m1;private static Method m3;private static Method m2;private static Method m0;public $Proxy0(InvocationHandler paramInvocationHandler) {super(paramInvocationHandler);}public final boolean equals(Object paramObject) {return((Boolean) this.h.invoke(this, m1,new Object[] { paramObject })).booleanValue();}public final void sayHello() {this.h.invoke(this, m3, null);}public final String toString() {return (String) this.h.invoke(this, m2, null);}public final int hashCode() {return ((Integer) this.h.invoke(this, m0, null)).intValue();}static {m1 = Class.forName("java.lang.Object").getMethod("equals",new Class[] { Class.forName("java.lang.Object") });m3 = Class.forName("laoma.demo.proxy.SimpleJDKDynamicProxyDemo$IService").getMethod("sayHello",new Class[0]);m2 = Class.forName("java.lang.Object").getMethod("toString", new Class[0]);m0 = Class.forName("java.lang.Object").getMethod("hashCode", new Class[0]);}}

public class SimpleCGLibDemo {static class RealService {public void sayHello() {System.out.println("hello");}}static class SimpleInterceptor implements MethodInterceptor {@Overridepublic Object intercept(Object object, Method method, Object[] args,MethodProxy methodProxy) throws Throwable {System.out.println("start " + method.getName());Object result = methodProxy.invokeSuper(object, args);System.out.println("end " + method.getName());return result;}}private static <T> T getProxy(Class<T> cls) {Enhancer enhancer = new Enhancer();enhancer.setSuperclass(cls);enhancer.setCallback(new SimpleInterceptor());return (T) enhancer.create();}public static void main(String[] args) {RealService proxy = getProxy(RealService.class);proxy.sayHello();}
}