【cglib代理】 四个步骤演示

package com.****.test;

import com.****.config.SpringConfig;
import com.****.logger.Logger;
import com.****.service.AccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cglib.proxy.Enhancer;
import org.springframework.cglib.proxy.InvocationHandler;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.lang.reflect.Method;

//启动容器
@RunWith(SpringJUnit4ClassRunner.class)
//向容器中添加配置
@ContextConfiguration(classes = SpringConfig.class)
public class AccountServiceTest {
    @Autowired
    private AccountService accountService;
    @Autowired
    private Logger logger;
    @Test
    public void SaveTest() {
        //1.创建目标对象 已经有啦 直接拿过来accountService

        //2.编写增强逻辑
        InvocationHandler invocationHandler = new InvocationHandler() {
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                //2.1调取目标方法
                Object obj = null;
                logger.method1();
                try {
                    obj = method.invoke(accountService, args);

                } catch (Exception e) {
                    logger.method3();
                }
                logger.method2();
                return obj;
            }
        };

        //3.创建代理对象
        //3.1创建增强器
        Enhancer enhancer = new Enhancer();
        //3.2设置父类
        enhancer.setSuperclass(AccountService.class);
        //4.3设置增强逻辑
        enhancer. setCallback(invocationHandler);
        //4.3创建代理对象
        AccountService proxyInstance =(AccountService) enhancer.create();
        /*AccountService proxyInstance = (AccountService) Proxy.newProxyInstance(
                accountService.getClass().getClassLoader(),
                accountService.getClass().getInterfaces(),
                invocationHandler
        );*/
        //4.让代理对象工作
        proxyInstance.save();
    }
}