【旧】G006Spring学习笔记-IOC案例完善

package com.zibo.dao;

import com.zibo.domain.Account;

import java.util.List;

public interface IAccountDao {
    //查询所有账户
    List<Account> findAllAccount();
    //根据id查询账户
    Account findAccountById(Integer accountId);
    //保存账户
    void saveAccount(Account account);
    //更新账户
    void updateAccount(Account account);
    //删除用户
    void deleteAccountById(Integer accountId);

    /**
     * 通过名字查询账户
     * @param accountName       账户名字
     * @return                  账户
     * 备注：如果有唯一的一个结果就返回，如果没有结果返回null，如果结果超过一个抛异常
     */
    Account findAccountByName(String accountName);
}

package com.zibo.dao.impl;

import com.zibo.dao.IAccountDao;
import com.zibo.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * 账户的持久层实现类
 */
@Repository("accountDao")
public class AccountDaoImpl implements IAccountDao {
    @Autowired
    private QueryRunner runner;

    @Override
    public List<Account> findAllAccount() {
        try {
            return runner.query("select * from account",new BeanListHandler<>(Account.class));
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    @Override
    public Account findAccountById(Integer accountId) {
        try {
            return runner.query("select * from account where id = ?",new BeanHandler<>(Account.class),accountId);
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    @Override
    public void saveAccount(Account account) {
        try {
            runner.update("insert into account(name,money) values(?,?)",account.getName(),account.getMoney());
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    @Override
    public void updateAccount(Account account) {
        try {
            runner.update("update account set name = ?, money = ? where id = ?",account.getName(),account.getMoney(),account.getId());
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    @Override
    public void deleteAccountById(Integer accountId) {
        try {
            runner.update("delete from account where id = ?",accountId);
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }
    //转账
    @Override
    public Account findAccountByName(String accountName) {
        try {
            List<Account> accounts = runner.query("select * from account where name = ?",new BeanListHandler<>(Account.class),accountName);
            if(accounts==null || accounts.size()==0){
                return null;
            }else if(accounts.size()==1){
                return accounts.get(0);
            }else {
                throw new RuntimeException("结果不唯一，数据错误！");
            }
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }
}

package com.zibo.service;

import com.zibo.domain.Account;

import java.util.List;

/**
 *  账户的业务层接口
 */
public interface IAccountService {
    //查询所有账户
    List<Account> findAllAccount();
    //根据id查询账户
    Account findAccountById(Integer accountId);
    //保存账户
    void saveAccount(Account account);
    //更新账户
    void updateAccount(Account account);
    //删除用户
    void deleteAccountById(Integer accountId);

    /**
     * 转账
     * @param sourceName    转出者名字
     * @param targetName    转入者名字
     * @param money         转账金额
     */
    void transfer(String sourceName,String targetName,float money);
}

package com.zibo.service.impl;

import com.zibo.dao.IAccountDao;
import com.zibo.domain.Account;
import com.zibo.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * 账户的业务层实现类
 */
@Service("accountService")
public class AccountServiceImpl implements IAccountService {
    @Autowired
    private IAccountDao accountDao;

    @Override
    public List<Account> findAllAccount() {
        return accountDao.findAllAccount();
    }

    @Override
    public Account findAccountById(Integer accountId) {
        return accountDao.findAccountById(accountId);
    }

    @Override
    public void saveAccount(Account account) {
        accountDao.saveAccount(account);
    }

    @Override
    public void updateAccount(Account account) {
        accountDao.updateAccount(account);
    }

    @Override
    public void deleteAccountById(Integer accountId) {
        accountDao.deleteAccountById(accountId);
    }
    //转账
    @Override
    public void transfer(String sourceName, String targetName, float money) {
        //1、根据名称查询转出账户；
        Account source = accountDao.findAccountByName(sourceName);
        //2、根据名称查询转入账户；
        Account target = accountDao.findAccountByName(targetName);
        //3、转出账户减钱；
        source.setMoney(source.getMoney()-money);
        //4、转入账户加钱；
        target.setMoney(target.getMoney()+money);
        //5、更新转出账户；
        accountDao.updateAccount(source);
        //6、更新转入账户；
        accountDao.updateAccount(target);
    }
}

package com.zibo.test;

import com.zibo.config.SpringConfiguration;
import com.zibo.domain.Account;
import com.zibo.service.IAccountService;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.List;

/**
 * 使用junit单元测试进行测试
 * spring整合junit配置：
 *  1、导入spring整合junit的jar（坐标）；
 *  2、使用junit提供的注解，把原有的main方法替换成spring提供的@Runwith；
 *  3、告知spring的运行器，spring的ioc创建是基于xml还是注解，并说明其位置，使用@ContextConfiguration；
 *  ContextConfiguration:
 *      locations：指定xml文件的位置，加上classpath关键字，表示在类路径下；
 *      classes：指定注解类所在的位置；
 *  备注：当我们使用5.x版本的时候，junit的jar必须是4.12以上；
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfiguration.class)
public class AccountServiceTest {
//    private ApplicationContext ac;
    @Autowired
    private IAccountService as;
    @Before
    public void init(){
        //1、获取容器
//        ac = new ClassPathXmlApplicationContext("bean.xml");
//        ac = new AnnotationConfigApplicationContext(SpringConfiguration.class);
        //2、得到业务层对象
//        as = ac.getBean("accountService", IAccountService.class);
    }
    @Before
    public void end(){
//        ac.close();
    }
    @Test
    public void testFindAllAccount(){
        //3、执行方法
        List<Account> accounts = as.findAllAccount();
        //4、遍历输出
        for (Account account : accounts) {
            System.out.println(account);
        }
    }
    @Test
    public void testFindAccountById(){
        Account account = as.findAccountById(1);
        System.out.println(account);
    }
    @Test
    public void testSave(){
        Account account = new Account();
        account.setName("大哥");
        account.setMoney(2000);
        as.saveAccount(account);
    }
    @Test
    public void testUpdate(){
        Account account = new Account();
        account.setId(3);
        account.setName("二哥");
        account.setMoney(3000);
        as.updateAccount(account);
    }
    @Test
    public void testDelete(){
        as.deleteAccountById(1);
    }
    //转账测试
    @Test
    public void testTransfer(){
        as.transfer("二哥","bbb",500);
    }
}

    //转账
    @Override
    public void transfer(String sourceName, String targetName, float money) {
        //1、根据名称查询转出账户；
        Account source = accountDao.findAccountByName(sourceName);
        //2、根据名称查询转入账户；
        Account target = accountDao.findAccountByName(targetName);
        //3、转出账户减钱；
        source.setMoney(source.getMoney()-money);
        //4、转入账户加钱；
        target.setMoney(target.getMoney()+money);
        //5、更新转出账户；
        accountDao.updateAccount(source);

        //在这写一个错误，会导致转账过程中转出账户钱减了，但是转入账户钱没加
        int i = 1/0;

        //6、更新转入账户；
        accountDao.updateAccount(target);
    }

package com.itheima.service.impl;

import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import com.itheima.utils.TransactionManager;

import java.util.List;

/**
 * 账户的业务层实现类
 *
 * 事务控制应该都是在业务层
 */
public class AccountServiceImpl_OLD implements IAccountService{

    private IAccountDao accountDao;
    private TransactionManager txManager;

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

    public void setAccountDao(IAccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public List<Account> findAllAccount() {
        try {
            //1.开启事务
            txManager.beginTransaction();
            //2.执行操作
            List<Account> accounts = accountDao.findAllAccount();
            //3.提交事务
            txManager.commit();
            //4.返回结果
            return accounts;
        }catch (Exception e){
            //5.回滚操作
            txManager.rollback();
            throw new RuntimeException(e);
        }finally {
            //6.释放连接
            txManager.release();
        }

    }

    @Override
    public Account findAccountById(Integer accountId) {
        try {
            //1.开启事务
            txManager.beginTransaction();
            //2.执行操作
            Account account = accountDao.findAccountById(accountId);
            //3.提交事务
            txManager.commit();
            //4.返回结果
            return account;
        }catch (Exception e){
            //5.回滚操作
            txManager.rollback();
            throw new RuntimeException(e);
        }finally {
            //6.释放连接
            txManager.release();
        }
    }

    @Override
    public void saveAccount(Account account) {
        try {
            //1.开启事务
            txManager.beginTransaction();
            //2.执行操作
            accountDao.saveAccount(account);
            //3.提交事务
            txManager.commit();
        }catch (Exception e){
            //4.回滚操作
            txManager.rollback();
        }finally {
            //5.释放连接
            txManager.release();
        }

    }

    @Override
    public void updateAccount(Account account) {
        try {
            //1.开启事务
            txManager.beginTransaction();
            //2.执行操作
            accountDao.updateAccount(account);
            //3.提交事务
            txManager.commit();
        }catch (Exception e){
            //4.回滚操作
            txManager.rollback();
        }finally {
            //5.释放连接
            txManager.release();
        }

    }

    @Override
    public void deleteAccount(Integer acccountId) {
        try {
            //1.开启事务
            txManager.beginTransaction();
            //2.执行操作
            accountDao.deleteAccount(acccountId);
            //3.提交事务
            txManager.commit();
        }catch (Exception e){
            //4.回滚操作
            txManager.rollback();
        }finally {
            //5.释放连接
            txManager.release();
        }

    }

    @Override
    public void transfer(String sourceName, String targetName, Float money) {
        try {
            //1.开启事务
            txManager.beginTransaction();
            //2.执行操作

            //2.1根据名称查询转出账户
            Account source = accountDao.findAccountByName(sourceName);
            //2.2根据名称查询转入账户
            Account target = accountDao.findAccountByName(targetName);
            //2.3转出账户减钱
            source.setMoney(source.getMoney()-money);
            //2.4转入账户加钱
            target.setMoney(target.getMoney()+money);
            //2.5更新转出账户
            accountDao.updateAccount(source);

            int i=1/0;

            //2.6更新转入账户
            accountDao.updateAccount(target);
            //3.提交事务
            txManager.commit();

        }catch (Exception e){
            //4.回滚操作
            txManager.rollback();
            e.printStackTrace();
        }finally {
            //5.释放连接
            txManager.release();
        }


    }
}

package com.itheima.utils;

import javax.sql.DataSource;
import java.sql.Connection;

/**
 * 连接的工具类，它用于从数据源中获取一个连接，并且实现和线程的绑定
 */
public class ConnectionUtils {

    private ThreadLocal<Connection> tl = new ThreadLocal<Connection>();

    private DataSource dataSource;

    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }

    /**
     * 获取当前线程上的连接
     * @return
     */
    public Connection getThreadConnection() {
        try{
            //1.先从ThreadLocal上获取
            Connection conn = tl.get();
            //2.判断当前线程上是否有连接
            if (conn == null) {
                //3.从数据源中获取一个连接，并且存入ThreadLocal中
                conn = dataSource.getConnection();
                tl.set(conn);
            }
            //4.返回当前线程上的连接
            return conn;
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    /**
     * 把连接和线程解绑
     */
    public void removeConnection(){
        tl.remove();
    }
}

package com.itheima.utils;

/**
 * 和事务管理相关的工具类，它包含了，开启事务，提交事务，回滚事务和释放连接
 */
public class TransactionManager {

    private ConnectionUtils connectionUtils;

    public void setConnectionUtils(ConnectionUtils connectionUtils) {
        this.connectionUtils = connectionUtils;
    }

    /**
     * 开启事务
     */
    public  void beginTransaction(){
        try {
            connectionUtils.getThreadConnection().setAutoCommit(false);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    /**
     * 提交事务
     */
    public  void commit(){
        try {
            connectionUtils.getThreadConnection().commit();
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    /**
     * 回滚事务
     */
    public  void rollback(){
        try {
            connectionUtils.getThreadConnection().rollback();
        }catch (Exception e){
            e.printStackTrace();
        }
    }


    /**
     * 释放连接
     */
    public  void release(){
        try {
            connectionUtils.getThreadConnection().close();//还回连接池中
            connectionUtils.removeConnection();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

<?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.itheima.factory.BeanFactory">
        <!-- 注入service -->
        <property name="accountService" ref="accountService"/>
        <!-- 注入事务管理器 -->
        <property name="txManager" ref="txManager"/>
    </bean>

     <!-- 配置Service -->
    <bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl">
        <!-- 注入dao -->
        <property name="accountDao" ref="accountDao"/>
    </bean>

    <!--配置Dao对象-->
    <bean id="accountDao" class="com.itheima.dao.impl.AccountDaoImpl">
        <!-- 注入QueryRunner -->
        <property name="runner" ref="runner"/>
        <!-- 注入ConnectionUtils -->
        <property name="connectionUtils" ref="connectionUtils"/>
    </bean>

    <!--配置QueryRunner-->
    <bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype"/>

    <!-- 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/eesy"/>
        <property name="user" value="root"/>
        <property name="password" value="1234"/>
    </bean>

    <!-- 配置Connection的工具类 ConnectionUtils -->
    <bean id="connectionUtils" class="com.itheima.utils.ConnectionUtils">
        <!-- 注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 配置事务管理器-->
    <bean id="txManager" class="com.itheima.utils.TransactionManager">
        <!-- 注入ConnectionUtils -->
        <property name="connectionUtils" ref="connectionUtils"/>
    </bean>
</beans>

package com.zibo.proxy;

//对生产厂家要求的接口
public interface IProducer {

    //销售
    public void saleProduct(float money);

    //售后
    public void afterService(float money);

}

package com.zibo.proxy;

//生产者
public class Producer implements IProducer {

    //销售
    public void saleProduct(float money){
        System.out.println("销售产品，拿到钱" + money);
    }

    //售后
    public void afterService(float money){
        System.out.println("提供售后服务，并拿到钱" + money);
    }

}

package com.zibo.proxy;

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

//模拟一个消费者
public class Client {
    public static void main(String[] args) {
        Producer producer = new Producer();
        /*
         * 动态代理：
         *  特点：字节码随用随创建，随用随加载
         *  作用：不修改源码的基础上，对方法增强；
         *  分类：
         *      基于接口的动态代理；
         *      基于子类的动态代理；
         *  基于接口的动态代理：
         *      涉及的类：Proxy；
         *      提供者：JDK官方；
         *  如何创建代理对象：
         *      使用Proxy类中的newProxyInstance方法；
         *  创建代理对象的要求：
         *      被代理类最少实现一个接口，否则不能使用；
         *  newProxyInstance方法的参数：
         *      ClassLoader：类加载器，用于加载代理对象的字节码，使用和被代理对象相同的类加载器，固定写法；
         *      Class[]：用于让代理对象和被代理对象有相同的方法，固定写法；
         *      InvocationHandler：用于提供增强的方法，让我们写如何代理，一般写该接口的实现类（匿名内部类，不是必须）；
         *      此接口的实现类是谁用谁写；
         */
        IProducer proxyProducer = (IProducer)Proxy.newProxyInstance(producer.getClass().getClassLoader(), producer.getClass().getInterfaces(),
                new InvocationHandler() {
                    /**
                     * //作用：执行被代理对象的任何接口方法都会经过该方法
                     * @param proxy 代理对象的引用
                     * @param method    当前执行的方法
                     * @param args  当前执行方法所需要的参数
                     * @return  和被代理对象有相同的返回值
                     */
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                //提供增强的代代码，经销商拿走销售提成
                Object returnValue = null;
                //1、获取方法执行的参数
                float money = (float) args[0];
                //2、判断当前方法是不是销售
                if("saleProduct".equals(method.getName())){
                    returnValue = method.invoke(producer,money * 0.8f);
                }
                return returnValue;
            }
        });
        proxyProducer.saleProduct(10000f);
    }
}

package com.zibo.cglib;

 import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;

//模拟一个消费者
public class Client {
    public static void main(String[] args) {
        Producer producer = new Producer();
        /*
         * 动态代理：
         *  特点：字节码随用随创建，随用随加载
         *  作用：不修改源码的基础上，对方法增强；
         *  分类：
         *      基于接口的动态代理；
         *      基于子类的动态代理；
         *  基于子类的动态代理：
         *      涉及的类：Enhancer；
         *      提供者：第三方cglib库；
         *  如何创建代理对象：
         *      使用Enhancer类中的create方法；
         *  创建代理对象的要求：
         *      被代理类不能是最终类；
         *  create方法的参数：
         *      Class：字节码，用于指定被代理对象的字节码；
         *      CallBack：用于提供增强的代码；
         *      它是让我们写如何代理，一般写该接口的实现类（匿名内部类，不是必须）；
         *      此接口的实现类是谁用谁写；
         *      我们一般写的都是该接口的子接口实现类：MethodInterceptor
         */
        Producer cglibProducer = (Producer)Enhancer.create(producer.getClass(), new MethodInterceptor() {
            /**
             * //作用：执行被代理对象的任何接口方法都会经过该方法
             * @param proxy     见invoke
             * @param method    见invoke
             * @param args   见invoke
             * @param methodProxy   当前执行方法的代理对象
             * @return
             * @throws Throwable
             */
            @Override
            public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
                //提供增强的代代码，经销商拿走销售提成
                Object returnValue = null;
                //1、获取方法执行的参数
                float money = (float) args[0];
                //2、判断当前方法是不是销售
                if("saleProduct".equals(method.getName())){
                    returnValue = method.invoke(producer,money * 0.8f);
                }
                return returnValue;
            }
        });
        cglibProducer.saleProduct(12000f);
    }
}

package com.zibo.cglib;

//生产者
public class Producer {

    //销售
    public void saleProduct(float money){
        System.out.println("销售产品，拿到钱" + money);
    }

    //售后
    public void afterService(float money){
        System.out.println("提供售后服务，并拿到钱" + money);
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>spring09</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>2.1_3</version>
        </dependency>
    </dependencies>


</project>

package com.itheima.factory;

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

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

/**
 * 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;
    }

    /**
     * 获取Service代理对象
     * @return
     */
    public IAccountService getAccountService() {
        return (IAccountService)Proxy.newProxyInstance(accountService.getClass().getClassLoader(),
                accountService.getClass().getInterfaces(),
                new InvocationHandler() {
                    /**
                     * 添加事务的支持
                     *
                     * @param proxy
                     * @param method
                     * @param args
                     * @return
                     * @throws Throwable
                     */
                    @Override
                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

                        if("test".equals(method.getName())){
                            return method.invoke(accountService,args);
                        }

                        Object rtValue = null;
                        try {
                            //1.开启事务
                            txManager.beginTransaction();
                            //2.执行操作
                            rtValue = method.invoke(accountService, args);
                            //3.提交事务
                            txManager.commit();
                            //4.返回结果
                            return rtValue;
                        } catch (Exception e) {
                            //5.回滚操作
                            txManager.rollback();
                            throw new RuntimeException(e);
                        } finally {
                            //6.释放连接
                            txManager.release();
                        }
                    }
                });

    }
}

package com.itheima.test;

import com.itheima.service.IAccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * 使用Junit单元测试：测试我们的配置
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:bean.xml")
public class AccountServiceTest {

    @Autowired
    @Qualifier("proxyAccountService")
    private  IAccountService as;

    @Test
    public  void testTransfer(){
        as.transfer("aaa","bbb",100f);
    }

}

package com.itheima.service.impl;

import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;

import java.util.List;

/**
 * 账户的业务层实现类
 *
 * 事务控制应该都是在业务层
 */
public class AccountServiceImpl implements IAccountService{

    private IAccountDao accountDao;

    public void setAccountDao(IAccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public List<Account> findAllAccount() {
       return accountDao.findAllAccount();
    }

    @Override
    public Account findAccountById(Integer accountId) {
        return accountDao.findAccountById(accountId);

    }

    @Override
    public void saveAccount(Account account) {
        accountDao.saveAccount(account);
    }

    @Override
    public void updateAccount(Account account) {
        accountDao.updateAccount(account);
    }

    @Override
    public void deleteAccount(Integer acccountId) {
        accountDao.deleteAccount(acccountId);
    }

    @Override
    public void transfer(String sourceName, String targetName, Float money) {
        System.out.println("transfer....");
            //2.1根据名称查询转出账户
            Account source = accountDao.findAccountByName(sourceName);
            //2.2根据名称查询转入账户
            Account target = accountDao.findAccountByName(targetName);
            //2.3转出账户减钱
            source.setMoney(source.getMoney()-money);
            //2.4转入账户加钱
            target.setMoney(target.getMoney()+money);
            //2.5更新转出账户
            accountDao.updateAccount(source);

//            int i=1/0;

            //2.6更新转入账户
            accountDao.updateAccount(target);
    }
}

package com.itheima.factory;

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

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

/**
 * 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;
    }

    /**
     * 获取Service代理对象
     * @return
     */
    public IAccountService getAccountService() {
        return (IAccountService)Proxy.newProxyInstance(accountService.getClass().getClassLoader(),
                accountService.getClass().getInterfaces(),
                new InvocationHandler() {
                    /**
                     * 添加事务的支持
                     *
                     * @param proxy
                     * @param method
                     * @param args
                     * @return
                     * @throws Throwable
                     */
                    @Override
                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

                        if("test".equals(method.getName())){
                            return method.invoke(accountService,args);
                        }

                        Object rtValue = null;
                        try {
                            //1.开启事务
                            txManager.beginTransaction();
                            //2.执行操作
                            rtValue = method.invoke(accountService, args);
                            //3.提交事务
                            txManager.commit();
                            //4.返回结果
                            return rtValue;
                        } catch (Exception e) {
                            //5.回滚操作
                            txManager.rollback();
                            throw new RuntimeException(e);
                        } finally {
                            //6.释放连接
                            txManager.release();
                        }
                    }
                });

    }
}