自己留存。

package com.daili;

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

public class MJ {
    public static void main(String[] args) {
        Object object = Proxy.newProxyInstance(MJ.class.getClassLoader(), new Class[]{IAplusB.class}, new InvocationHandler() {//返回代理对象
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                System.out.println(method.getName());
                System.out.println("从数据库连接池获取连接");
                System.out.println("解析xml文件");
                System.out.println("解析方法");
                System.out.println("获得的sql为xxx");
                System.out.println("给参数赋值");
                System.out.println("执行sql");
                System.out.println("获得结果");
                int invoke = 100;
                return invoke;
            }
        });
        if (object instanceof IAplusB){
            IAplusB iAplusB = (IAplusB) object;
            int add = iAplusB.add();
            System.out.println(add);
        }
    }
}
interface IAplusB{
    int add();
}