通过实现类手写动态代理

package com.hikversion.controller;

import org.springframework.cglib.proxy.Enhancer;
import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;

public class TestMethodInterceptor {

public static void main(String[] args) {
    Enhancer enhancer=new Enhancer();
    enhancer.setSuperclass(TestMethodInterceptor.class);
    enhancer.setCallback(new adviseMethodInterceptor());

    Object proxy = enhancer.create();
    TestMethodInterceptor methodInterceptor = (TestMethodInterceptor) proxy;

    methodInterceptor.doSomeThing("通过代理工厂设置代理对象，拦截代理方法");
}

public static class adviseMethodInterceptor implements MethodInterceptor {
    public Object intercept(Object arg0, Method method, Object[] arg2, MethodProxy arg3)throws Throwable {
        System.out.println("==================");
        arg3.invokeSuper(arg0, arg2);
        System.out.println("expected role is  but now is " );
        return null;
    }
}

public String doSomeThing(String someThing){
    System.out.println("执行被拦截的方法："+someThing);
    //int i=5/0;
    return "执行被拦截的方法："+someThing;
}

}