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();

    }
}

 

posted on 2017-02-24 13:46  每当变幻时  阅读(645)  评论(0编辑  收藏  举报

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