java實現(xiàn)動態(tài)代理示例分享

2019-11-26 15:35:30

字體：大中小

供稿：網(wǎng)友

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

public class LogHandler implements InvocationHandler {
private Object delegate;

    public Object bind(Object delegate) {
        this.delegate = delegate;
        return Proxy.newProxyInstance(delegate.getClass().getClassLoader(),
                delegate.getClass().getInterfaces(), this);
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        Object result = null;
        try {
            System.out.println("方法開始：" + method);
            result = method.invoke(delegate, args);
            System.out.println("方法結(jié)束：" + method);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}

復(fù)制代碼代碼如下:

public interface Animal {
    public void hello();
}

動態(tài)代理作為代理模式的一種擴展形式，廣泛應(yīng)用于框架（尤其是基于AOP的框架）的設(shè)計與開發(fā)，本文將通過實例來講解Java動態(tài)代理的實現(xiàn)過程。

復(fù)制代碼代碼如下:

public class Monkey implements Animal {

    @Override
    public void hello() {
        // TODO Auto-generated method stub
        System.out.println("hello");
    }
}

復(fù)制代碼代碼如下:

public class Main {
    public static void main(String[] args) {
        LogHandler logHandler = new LogHandler();
        Animal animal = (Animal) logHandler.bind(new Monkey());
        animal.hello();
    }
}