一、完善account案例
1、添加轉賬方法
代碼:
接口IAccountDao:
package com.zibo.dao;
import com.zibo.domain.Account;
import java.util.List;
public interface IAccountDao {
//查詢所有賬戶
List<Account> findAllAccount();
//根據id查詢賬戶
Account findAccountById(Integer accountId);
//保存賬戶
void saveAccount(Account account);
//更新賬戶
void updateAccount(Account account);
//刪除用戶
void deleteAccountById(Integer accountId);
/**
* 通過名字查詢賬戶
* @param accountName 賬戶名字
* @return 賬戶
* 備註:如果有唯一的一個結果就返回,如果沒有結果返回null,如果結果超過一個拋異常
*/
Account findAccountByName(String accountName);
}
接口實現類AccountDaoImpl:
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;
/**
* 賬戶的持久層實現類
*/
@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);
}
}
//轉賬
@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("結果不唯一,數據錯誤!");
}
}catch (Exception e){
throw new RuntimeException(e);
}
}
}
接口IAccountService:
package com.zibo.service;
import com.zibo.domain.Account;
import java.util.List;
/**
* 賬戶的業務層接口
*/
public interface IAccountService {
//查詢所有賬戶
List<Account> findAllAccount();
//根據id查詢賬戶
Account findAccountById(Integer accountId);
//保存賬戶
void saveAccount(Account account);
//更新賬戶
void updateAccount(Account account);
//刪除用戶
void deleteAccountById(Integer accountId);
/**
* 轉賬
* @param sourceName 轉出者名字
* @param targetName 轉入者名字
* @param money 轉賬金額
*/
void transfer(String sourceName,String targetName,float money);
}
接口實現類AccountServiceImpl:
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;
/**
* 賬戶的業務層實現類
*/
@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);
}
//轉賬
@Override
public void transfer(String sourceName, String targetName, float money) {
//1、根據名稱查詢轉出賬戶;
Account source = accountDao.findAccountByName(sourceName);
//2、根據名稱查詢轉入賬戶;
Account target = accountDao.findAccountByName(targetName);
//3、轉出賬戶減錢;
source.setMoney(source.getMoney()-money);
//4、轉入賬戶加錢;
target.setMoney(target.getMoney()+money);
//5、更新轉出賬戶;
accountDao.updateAccount(source);
//6、更新轉入賬戶;
accountDao.updateAccount(target);
}
}
測試類AccountServiceTest:
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單元測試進行測試
* spring整合junit配置:
* 1、導入spring整合junit的jar(座標);
* 2、使用junit提供的註解,把原有的main方法替換成spring提供的@Runwith;
* 3、告知spring的運行器,spring的ioc創建是基於xml還是註解,並說明其位置,使用@ContextConfiguration;
* ContextConfiguration:
* locations:指定xml文件的位置,加上classpath關鍵字,表示在類路徑下;
* classes:指定註解類所在的位置;
* 備註:當我們使用5.x版本的時候,junit的jar必須是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、獲取容器
// ac = new ClassPathXmlApplicationContext("bean.xml");
// ac = new AnnotationConfigApplicationContext(SpringConfiguration.class);
//2、得到業務層對象
// as = ac.getBean("accountService", IAccountService.class);
}
@Before
public void end(){
// ac.close();
}
@Test
public void testFindAllAccount(){
//3、執行方法
List<Account> accounts = as.findAllAccount();
//4、遍歷輸出
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);
}
//轉賬測試
@Test
public void testTransfer(){
as.transfer("二哥","bbb",500);
}
}
文件位置圖:
備註:
其他文件見G005Spring學習筆記-Spring完全註解實現及優化;
發現問題:
//轉賬
@Override
public void transfer(String sourceName, String targetName, float money) {
//1、根據名稱查詢轉出賬戶;
Account source = accountDao.findAccountByName(sourceName);
//2、根據名稱查詢轉入賬戶;
Account target = accountDao.findAccountByName(targetName);
//3、轉出賬戶減錢;
source.setMoney(source.getMoney()-money);
//4、轉入賬戶加錢;
target.setMoney(target.getMoney()+money);
//5、更新轉出賬戶;
accountDao.updateAccount(source);
//在這寫一個錯誤,會導致轉賬過程中轉出賬戶錢減了,但是轉入賬戶錢沒加
int i = 1/0;
//6、更新轉入賬戶;
accountDao.updateAccount(target);
}
分析問題:
解決問題:
進行事務控制;
代碼示例:
AccountServiceImpl:
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;
/**
* 賬戶的業務層實現類
*
* 事務控制應該都是在業務層
*/
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.開啓事務
txManager.beginTransaction();
//2.執行操作
List<Account> accounts = accountDao.findAllAccount();
//3.提交事務
txManager.commit();
//4.返回結果
return accounts;
}catch (Exception e){
//5.回滾操作
txManager.rollback();
throw new RuntimeException(e);
}finally {
//6.釋放連接
txManager.release();
}
}
@Override
public Account findAccountById(Integer accountId) {
try {
//1.開啓事務
txManager.beginTransaction();
//2.執行操作
Account account = accountDao.findAccountById(accountId);
//3.提交事務
txManager.commit();
//4.返回結果
return account;
}catch (Exception e){
//5.回滾操作
txManager.rollback();
throw new RuntimeException(e);
}finally {
//6.釋放連接
txManager.release();
}
}
@Override
public void saveAccount(Account account) {
try {
//1.開啓事務
txManager.beginTransaction();
//2.執行操作
accountDao.saveAccount(account);
//3.提交事務
txManager.commit();
}catch (Exception e){
//4.回滾操作
txManager.rollback();
}finally {
//5.釋放連接
txManager.release();
}
}
@Override
public void updateAccount(Account account) {
try {
//1.開啓事務
txManager.beginTransaction();
//2.執行操作
accountDao.updateAccount(account);
//3.提交事務
txManager.commit();
}catch (Exception e){
//4.回滾操作
txManager.rollback();
}finally {
//5.釋放連接
txManager.release();
}
}
@Override
public void deleteAccount(Integer acccountId) {
try {
//1.開啓事務
txManager.beginTransaction();
//2.執行操作
accountDao.deleteAccount(acccountId);
//3.提交事務
txManager.commit();
}catch (Exception e){
//4.回滾操作
txManager.rollback();
}finally {
//5.釋放連接
txManager.release();
}
}
@Override
public void transfer(String sourceName, String targetName, Float money) {
try {
//1.開啓事務
txManager.beginTransaction();
//2.執行操作
//2.1根據名稱查詢轉出賬戶
Account source = accountDao.findAccountByName(sourceName);
//2.2根據名稱查詢轉入賬戶
Account target = accountDao.findAccountByName(targetName);
//2.3轉出賬戶減錢
source.setMoney(source.getMoney()-money);
//2.4轉入賬戶加錢
target.setMoney(target.getMoney()+money);
//2.5更新轉出賬戶
accountDao.updateAccount(source);
int i=1/0;
//2.6更新轉入賬戶
accountDao.updateAccount(target);
//3.提交事務
txManager.commit();
}catch (Exception e){
//4.回滾操作
txManager.rollback();
e.printStackTrace();
}finally {
//5.釋放連接
txManager.release();
}
}
}
ConnectionUtils連接工具類:
package com.itheima.utils;
import javax.sql.DataSource;
import java.sql.Connection;
/**
* 連接的工具類,它用於從數據源中獲取一個連接,並且實現和線程的綁定
*/
public class ConnectionUtils {
private ThreadLocal<Connection> tl = new ThreadLocal<Connection>();
private DataSource dataSource;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
/**
* 獲取當前線程上的連接
* @return
*/
public Connection getThreadConnection() {
try{
//1.先從ThreadLocal上獲取
Connection conn = tl.get();
//2.判斷當前線程上是否有連接
if (conn == null) {
//3.從數據源中獲取一個連接,並且存入ThreadLocal中
conn = dataSource.getConnection();
tl.set(conn);
}
//4.返回當前線程上的連接
return conn;
}catch (Exception e){
throw new RuntimeException(e);
}
}
/**
* 把連接和線程解綁
*/
public void removeConnection(){
tl.remove();
}
}
TransactionManager事務工具類:
package com.itheima.utils;
/**
* 和事務管理相關的工具類,它包含了,開啓事務,提交事務,回滾事務和釋放連接
*/
public class TransactionManager {
private ConnectionUtils connectionUtils;
public void setConnectionUtils(ConnectionUtils connectionUtils) {
this.connectionUtils = connectionUtils;
}
/**
* 開啓事務
*/
public void beginTransaction(){
try {
connectionUtils.getThreadConnection().setAutoCommit(false);
}catch (Exception e){
e.printStackTrace();
}
}
/**
* 提交事務
*/
public void commit(){
try {
connectionUtils.getThreadConnection().commit();
}catch (Exception e){
e.printStackTrace();
}
}
/**
* 回滾事務
*/
public void rollback(){
try {
connectionUtils.getThreadConnection().rollback();
}catch (Exception e){
e.printStackTrace();
}
}
/**
* 釋放連接
*/
public void release(){
try {
connectionUtils.getThreadConnection().close();//還回連接池中
connectionUtils.removeConnection();
}catch (Exception e){
e.printStackTrace();
}
}
}
bean.xml配置文件:
<?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"/>
<!-- 注入事務管理器 -->
<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對象-->
<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"/>
<!-- 配置數據源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!--連接數據庫的必備信息-->
<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的工具類 ConnectionUtils -->
<bean id="connectionUtils" class="com.itheima.utils.ConnectionUtils">
<!-- 注入數據源-->
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 配置事務管理器-->
<bean id="txManager" class="com.itheima.utils.TransactionManager">
<!-- 注入ConnectionUtils -->
<property name="connectionUtils" ref="connectionUtils"/>
</bean>
</beans>
二、分析案例中的問題
案例中存在很多重複代碼和“牽一髮動全身”的麻煩;
三、技術回顧:動態代理
1、簡單案例(基於接口的動態代理)
代碼:
IProducer限制廠家的接口:
package com.zibo.proxy;
//對生產廠家要求的接口
public interface IProducer {
//銷售
public void saleProduct(float money);
//售後
public void afterService(float money);
}
Producer廠家類:
package com.zibo.proxy;
//生產者
public class Producer implements IProducer {
//銷售
public void saleProduct(float money){
System.out.println("銷售產品,拿到錢" + money);
}
//售後
public void afterService(float money){
System.out.println("提供售後服務,並拿到錢" + money);
}
}
Client模擬顧客類:
package com.zibo.proxy;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
//模擬一個消費者
public class Client {
public static void main(String[] args) {
Producer producer = new Producer();
/*
* 動態代理:
* 特點:字節碼隨用隨創建,隨用隨加載
* 作用:不修改源碼的基礎上,對方法增強;
* 分類:
* 基於接口的動態代理;
* 基於子類的動態代理;
* 基於接口的動態代理:
* 涉及的類:Proxy;
* 提供者:JDK官方;
* 如何創建代理對象:
* 使用Proxy類中的newProxyInstance方法;
* 創建代理對象的要求:
* 被代理類最少實現一個接口,否則不能使用;
* newProxyInstance方法的參數:
* ClassLoader:類加載器,用於加載代理對象的字節碼,使用和被代理對象相同的類加載器,固定寫法;
* Class[]:用於讓代理對象和被代理對象有相同的方法,固定寫法;
* InvocationHandler:用於提供增強的方法,讓我們寫如何代理,一般寫該接口的實現類(匿名內部類,不是必須);
* 此接口的實現類是誰用誰寫;
*/
IProducer proxyProducer = (IProducer)Proxy.newProxyInstance(producer.getClass().getClassLoader(), producer.getClass().getInterfaces(),
new InvocationHandler() {
/**
* //作用:執行被代理對象的任何接口方法都會經過該方法
* @param proxy 代理對象的引用
* @param method 當前執行的方法
* @param args 當前執行方法所需要的參數
* @return 和被代理對象有相同的返回值
*/
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
//提供增強的代代碼,經銷商拿走銷售提成
Object returnValue = null;
//1、獲取方法執行的參數
float money = (float) args[0];
//2、判斷當前方法是不是銷售
if("saleProduct".equals(method.getName())){
returnValue = method.invoke(producer,money * 0.8f);
}
return returnValue;
}
});
proxyProducer.saleProduct(10000f);
}
}
文件位置圖:
運行結果:
2、簡單案例(基於子類的動態代理)
改造的代碼:
Client:
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;
//模擬一個消費者
public class Client {
public static void main(String[] args) {
Producer producer = new Producer();
/*
* 動態代理:
* 特點:字節碼隨用隨創建,隨用隨加載
* 作用:不修改源碼的基礎上,對方法增強;
* 分類:
* 基於接口的動態代理;
* 基於子類的動態代理;
* 基於子類的動態代理:
* 涉及的類:Enhancer;
* 提供者:第三方cglib庫;
* 如何創建代理對象:
* 使用Enhancer類中的create方法;
* 創建代理對象的要求:
* 被代理類不能是最終類;
* create方法的參數:
* Class:字節碼,用於指定被代理對象的字節碼;
* CallBack:用於提供增強的代碼;
* 它是讓我們寫如何代理,一般寫該接口的實現類(匿名內部類,不是必須);
* 此接口的實現類是誰用誰寫;
* 我們一般寫的都是該接口的子接口實現類:MethodInterceptor
*/
Producer cglibProducer = (Producer)Enhancer.create(producer.getClass(), new MethodInterceptor() {
/**
* //作用:執行被代理對象的任何接口方法都會經過該方法
* @param proxy 見invoke
* @param method 見invoke
* @param args 見invoke
* @param methodProxy 當前執行方法的代理對象
* @return
* @throws Throwable
*/
@Override
public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
//提供增強的代代碼,經銷商拿走銷售提成
Object returnValue = null;
//1、獲取方法執行的參數
float money = (float) args[0];
//2、判斷當前方法是不是銷售
if("saleProduct".equals(method.getName())){
returnValue = method.invoke(producer,money * 0.8f);
}
return returnValue;
}
});
cglibProducer.saleProduct(12000f);
}
}
Producer:
package com.zibo.cglib;
//生產者
public class Producer {
//銷售
public void saleProduct(float money){
System.out.println("銷售產品,拿到錢" + money);
}
//售後
public void afterService(float money){
System.out.println("提供售後服務,並拿到錢" + money);
}
}
pom.xml配置文件:
<?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>
文件位置圖:
運行結果:
四、使用動態代理實現事務控制
代碼:
BeanFactory:
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;
/**
* 用於創建Service的代理對象的工廠
*/
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;
}
/**
* 獲取Service代理對象
* @return
*/
public IAccountService getAccountService() {
return (IAccountService)Proxy.newProxyInstance(accountService.getClass().getClassLoader(),
accountService.getClass().getInterfaces(),
new InvocationHandler() {
/**
* 添加事務的支持
*
* @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.開啓事務
txManager.beginTransaction();
//2.執行操作
rtValue = method.invoke(accountService, args);
//3.提交事務
txManager.commit();
//4.返回結果
return rtValue;
} catch (Exception e) {
//5.回滾操作
txManager.rollback();
throw new RuntimeException(e);
} finally {
//6.釋放連接
txManager.release();
}
}
});
}
}
AccountServiceTest:
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單元測試:測試我們的配置
*/
@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);
}
}
AccountServiceImpl:
package com.itheima.service.impl;
import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import java.util.List;
/**
* 賬戶的業務層實現類
*
* 事務控制應該都是在業務層
*/
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根據名稱查詢轉出賬戶
Account source = accountDao.findAccountByName(sourceName);
//2.2根據名稱查詢轉入賬戶
Account target = accountDao.findAccountByName(targetName);
//2.3轉出賬戶減錢
source.setMoney(source.getMoney()-money);
//2.4轉入賬戶加錢
target.setMoney(target.getMoney()+money);
//2.5更新轉出賬戶
accountDao.updateAccount(source);
// int i=1/0;
//2.6更新轉入賬戶
accountDao.updateAccount(target);
}
}
BeanFactory:
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;
/**
* 用於創建Service的代理對象的工廠
*/
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;
}
/**
* 獲取Service代理對象
* @return
*/
public IAccountService getAccountService() {
return (IAccountService)Proxy.newProxyInstance(accountService.getClass().getClassLoader(),
accountService.getClass().getInterfaces(),
new InvocationHandler() {
/**
* 添加事務的支持
*
* @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.開啓事務
txManager.beginTransaction();
//2.執行操作
rtValue = method.invoke(accountService, args);
//3.提交事務
txManager.commit();
//4.返回結果
return rtValue;
} catch (Exception e) {
//5.回滾操作
txManager.rollback();
throw new RuntimeException(e);
} finally {
//6.釋放連接
txManager.release();
}
}
});
}
}
文件位置圖: