jdk动态代理例子

1. 声明接口

package cn.zhengyong.proxy;

/**
 * 接口
 * @author zhengyong
 *
 */
public interface OriginInterface {

    public void testProxy();

}

2. 实现接口

package cn.zhengyong.proxy;

/**
 * 实现类
 * @author zhengyong
 *
 */
public class OriginImpl implements OriginInterface{

    @Override
    public void testProxy() {
        System.out.println("test finish.");
    }
}

3. 创建代理类，需要持有接口对象

package cn.zhengyong.proxy;

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

/**
 * 
 * 代理类实现InvocationHandler
 * 
 * @author zhengyong
 *
 */
public class OriginProxy implements InvocationHandler{

    private Object target;

    public  OriginProxy(OriginInterface target){
        super();
        this.target = target;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

        System.out.println("begin invoke method.");

        Object result = method.invoke(target, args);

        System.out.println("end invoke method.");

        return result;
    }
}

4. 创建测试类

package cn.zhengyong.proxy;

import java.lang.reflect.Proxy;

/**
 * @author zhengyong
 *
 */
public class ProxyTest {

    public static void main(String[] args) {
        // 实例化目标对象
        OriginInterface target = new OriginImpl();
        // 根据目标对象创建代理对象
        OriginInterface proxy = (OriginInterface) Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), new OriginProxy(target));
        // 调用代理对象方法
        proxy.testProxy();
    }

}

 

5. 运行结果

begin invoke method.
test finish.
end invoke method.