动态代理在转账中的运用

package com.hope.factory;

import com.hope.service.IAccountService;
import com.hope.utils.TransactionManager;

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

/**
 * @author newcityman
 * @date 2019/11/22 - 20:33
 * 用于创建service的代理对象的工厂
 */
public class BeanFactory {
    private IAccountService accountService;
    private TransactionManager txManager;

    public void setTxManager(TransactionManager txManager) {
        this.txManager = txManager;
    }

    public final void setAccountService(IAccountService accountService) {
        this.accountService = accountService;
    }

    public IAccountService getAccountService() {
        return (IAccountService) Proxy.newProxyInstance(accountService.getClass().getClassLoader(), accountService.getClass().getInterfaces(),
                new InvocationHandler() {
                    @Override
                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                        Object rtValue = null;
                        try {
                            //       1、开启事务
                            txManager.beainTransaction();
                            //       2、执行方法
                            rtValue = method.invoke(accountService, args);
                            //       3、提交事务
                            txManager.commit();
                            //       4、返回结果
                            return rtValue;
                        } catch (Exception e) {
                            //            5、回滚事务
                            txManager.rollback();
                            e.printStackTrace();
                            throw new RuntimeException("错误信息如下：");
                        } finally {
                            //            6、释放资源
                            txManager.release();
                        }
                    }
                });
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--配置代理的service-->
    <bean id="proxyAccountService" factory-bean="beanFactory" factory-method="getAccountService"/>
    <!--配置beanfactory-->
    <bean id="beanFactory" class="com.hope.factory.BeanFactory">
        <property name="accountService" ref="accountService"></property>
        <property name="txManager" ref="txManager"></property>
    </bean>
    <!--配置service-->
    <bean id="accountService" class="com.hope.service.impl.AccountServiceImpl">
        <!--注入dao-->
        <property name="accountDao" ref="accountDao"/>
    </bean>
    <!--配置dao-->
    <bean id="accountDao" class="com.hope.dao.impl.AccountDaoImpl">
        <!--注入runner-->
        <property name="runner" ref="runner"/>
        <!--注入connectionUtils-->
        <property name="connectionUtils" ref="connctionUtils"/>
    </bean>
    <!--配置QueryRunner-->
    <bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
    </bean>
    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!--连接数据库的必备信息-->
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/easy"/>
        <property name="user" value="root"/>
        <property name="password" value="123"/>
    </bean>

    <bean name="connctionUtils" class="com.hope.utils.ConnectionUtils">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <bean name="txManager" class="com.hope.utils.TransactionManager">
        <property name="connectionUtils" ref="connctionUtils"/>
    </bean>
</beans>