java 動態代理 ， 多看看。 多用用。

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import java.lang.reflect.InvocationHandler; import java.lang.reflect.Proxy; import java.lang.reflect.Method; //抽象角色：java動態代理的實現目前只支援介面，不支援抽象類別 interface BusinessFoo {     void foo(); } interface BusinessBar{    String bar(String message);}//真實角色：真正實現商務邏輯方法class BusinessFooImpl implements BusinessFoo{    public void foo()    {        System.out.println("BusinessFooImpl.foo()");    }}class BusinessBarImpl implements BusinessBar{    public String bar(String message)    {        System.out.println("BusinessBarImpl.bar()");        return message;    }}//動態角色：動態組建代理程式類class BusinessImplProxy implements InvocationHandler{    private Object obj;    BusinessImplProxy() {    }    BusinessImplProxy(Object obj) {        this.obj = obj;    }    public Object invoke(Object proxy,Method method,Object[] args) throws Throwable    {        Object result = null;        doBefore();        result = method.invoke(obj,args);        doAfter();        return result;    }    public void doBefore(){        System.out.println("do something before Business Logic");    }    public void doAfter(){        System.out.println("do something after Business Logic");    }    public static Object factory(Object obj)    {        Class cls = obj.getClass();        return Proxy.newProxyInstance(cls.getClassLoader(),cls.getInterfaces(),new BusinessImplProxy(obj));    }}//測試類別public class DynamicProxy{       public static void main(String[] args) throws Throwable    {        BusinessFooImpl bfoo = new BusinessFooImpl();        BusinessFoo bf = (BusinessFoo)BusinessImplProxy.factory(bfoo);        bf.foo();        System.out.println();        BusinessBarImpl bbar = new BusinessBarImpl();        BusinessBar bb = (BusinessBar)BusinessImplProxy.factory(bbar);        String message = bb.bar("Hello,World");        System.out.println(message);    }}

 

java 動態代理 ， 多看看。 多用用。