Java Proxy

package com.su.liuqing.proxy_;

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

public class ProxyTest {

// 目标接口
public interface TarInterface {
    void say();
}

// 调用处理器
public static class MyHandler<T> implements InvocationHandler {
    // 目标对象
    private final T target;

    public MyHandler(T target) {
        this.target = target;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("方法执行前");
        // 目标方法执行
        return method.invoke(target, args);
    }
}

public static void main(String[] args) {
    // 目标对象
    TarInterface target = new TarInterface() {
        private final String name = "tar";

        public void say() {
            System.out.println("hello");
        }
    };
    MyHandler<TarInterface> myHandler = new MyHandler<>(target);
    // 创建代理对象
    Object proxyInstance = Proxy.newProxyInstance(ProxyTest.class.getClassLoader(), new Class[]{TarInterface.class}, myHandler);
    TarInterface p = (TarInterface) proxyInstance;
    p.say();
}

}