代理模式－积木模式

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();}
}