代理模式－积木模式

　　代理模式在实际开发中的确非常常见和常用，表面上代理模式是产生出一个代理类，作为访问实际实现类的代理，控制了外界对实际代理类的访问，在此基础上增加一些增强性的功能。实际上，还将实际实现作为一个粒度，将增强的部分功能分离解耦。

这里记录一下实现的一些代码：

静态代理：

public interface Subject {    void toilet();}public class RealSubject implements Subject{    public void toilet() {        System.out.println("toilet");    }}/** * 代理类控制了真实角色的访问权限 * 而从代理类自身增强的角度来看,可以说是控制了被代理功能的粒度细分的控制 */public class SubjectProxy implements Subject{    Subject subject =  new RealSubject();    public void toilet() {        System.out.println("take my phone");        subject.toilet();        System.out.println("smell bad");    }}

动态代理（java proxy）：

public class ProxyHandler implements InvocationHandler {    private Object object;    public ProxyHandler() {    }    public ProxyHandler(Object object) {        this.object = object;    }    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {        System.out.println("take my phone");        Object result = method.invoke(object,args);        System.out.println("smell bad");        return result;    }}public class TestProxy {    public static void main(String[] args) {        Subject subject = new RealSubject();        ProxyHandler proxyHandler = new ProxyHandler(subject);        Subject subjectProxy = (Subject)Proxy.newProxyInstance(subject.getClass().getClassLoader(),                subject.getClass().getInterfaces(),proxyHandler);        subjectProxy.toilet();    }}

动态代理（cglib）：

public class CglibProxyInterceptor implements MethodInterceptor{    public Object intercept(Object o, Method method,                            Object[] args, MethodProxy methodProxy)            throws Throwable {        System.out.println("take my phone");        Object o1 = methodProxy.invokeSuper(o, args);        System.out.println("smell bad");        return o1;    }}public class CglibProxyTest {    public static void main(String[] args) {        CglibProxyInterceptor cglibProxyInterceptor = new CglibProxyInterceptor();        Enhancer enhancer = new Enhancer();        enhancer.setCallback(cglibProxyInterceptor);        enhancer.setSuperclass(RealSubject.class);        Subject subject = (Subject)enhancer.create();        subject.toilet();    }}