技術標籤：Javaproxy

目標物件介面

Target.java

public interface Target {
    public void save();
}

目標物件實現

TargetImpl.java

import com.itheima.Target;

public class TargetImpl implements Target {
    public void save() {
        System.out.println("running.......");
    }
}

通知，功能目標

Advice.java

public
 
 class Advice {
    public  void before(){
        System.out.println("前置加強");
    }


    public void afterRunning(){
        System.out.println("後置加強");
    }
}

測試類

import com.itheima.impl.TargetImpl;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
 

import java.lang.reflect.Proxy;

public class ProxyTest {
    public static void main(String[] args) {
        final TargetImpl target = new TargetImpl();

        final Advice advice = new Advice();
        //返回值 就是生成的動態代理物件
        Target proxy = (Target) Proxy.newProxyInstance(
                target.
 
getClass().getClassLoader(),  //目標物件的載入器
                target.getClass().getInterfaces(),   //目標物件相同的介面位元組碼物件陣列
                new InvocationHandler() {
                    //呼叫代理物件的任何方法，實際是執行invoke();
                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                        advice.before();
                        Object invoke = method.invoke(target, args);//執行目標物件方法
                        advice.afterRunning();
                        return invoke;
                    }
                }
        );

        proxy.save();

    }
}

執行結果