Spring事务的实现方式主要有以下4种:
1)编程式事务:代码中显式调用beginTransaction()、commit()、rollback()等事务管理相关的方法;
2)基于 TransactionProxyFactoryBean的声明式事务管理;
3)基于 @Transactional 的声明式事务管理;
4)基于Aspectj AOP配置事务。
举例说明事务的不同实现:
说明:编程式事务基本已经淘汰。
/**
* 账户对象
*
*/
public class Account {
private int accountid;
private String name;
private String balance;
public int getAccountid() {
return accountid;
}
public void setAccountid(int accountid) {
this.accountid = accountid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getBalance() {
return balance;
}
public void setBalance(String balance) {
this.balance = balance;
}
}
/**
* 股票对象
*
*/
public class Stock {
private int stockid;
private String name;
private Integer count;
public Stock() {
super();
}
public Stock(int stockid, String name, Integer count) {
super();
this.stockid = stockid;
this.name = name;
this.count = count;
}
public int getStockid() {
return stockid;
}
public void setStockid(int stockid) {
this.stockid = stockid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getCount() {
return count;
}
public void setCount(Integer count) {
this.count = count;
}
}
DAO层
public interface AccountDao {
void addAccount(String name,double money);
void updateAccount(String name,double money,boolean isbuy);
}
public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {
@Override
public void addAccount(String name, double money) {
String sql = "insert account(name,balance) values(?,?);";
this.getJdbcTemplate().update(sql,name,money);
}
@Override
public void updateAccount(String name, double money, boolean isbuy) {
String sql = "update account set balance=balance+? where name=?";
if(isbuy)
sql = "update account set balance=balance-? where name=?";
this.getJdbcTemplate().update(sql, money,name);
}
}
public interface StockDao {
void addStock(String sname,int count);
void updateStock(String sname,int count,boolean isbuy);
}
public class StockDaoImpl extends JdbcDaoSupport implements StockDao {
@Override
public void addStock(String sname, int count) {
String sql = "insert into stock(name,count) values(?,?)";
this.getJdbcTemplate().update(sql,sname,count);
}
@Override
public void updateStock(String sname, int count, boolean isbuy) {
String sql = "update stock set count = count-? where name = ?";
if(isbuy)
sql = "update stock set count = count+? where name = ?";
this.getJdbcTemplate().update(sql, count,sname);
}
}
Service
public interface BuyStockService {
public void addAccount(String accountname, double money);
public void addStock(String stockname, int amount);
public void buyStock(String accountname, double money, String stockname, int amount) throws BuyStockException;
}
public class BuyStockServiceImpl implements BuyStockService{
private AccountDao accountDao;
private StockDao stockDao;
@Override
public void addAccount(String accountname, double money) {
accountDao.addAccount(accountname,money);
}
@Override
public void addStock(String stockname, int amount) {
stockDao.addStock(stockname,amount);
}
@Override
public void buyStock(String accountname, double money, String stockname, int amount) throws BuyStockException {
boolean isBuy = true;
accountDao.updateAccount(accountname, money, isBuy);
if(isBuy==true){
throw new BuyStockException("购买股票发生异常");
}
stockDao.updateStock(stockname, amount, isBuy);
}
public AccountDao getAccountDao() {
return accountDao;
}
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
public StockDao getStockDao() {
return stockDao;
}
public void setStockDao(StockDao stockDao) {
this.stockDao = stockDao;
}
}
/**
*自定义异常类
*/
public class BuyStockException extends Exception {
public BuyStockException() {
super();
}
public BuyStockException(String message) {
super(message);
}
}
基于 TransactionProxyFactoryBean的声明式事务管理
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-aop-4.2.xsd
">
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 注册数据源 C3P0 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<bean id="accountDao" class="transaction.test2.dao.AccountDaoImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="stockDao" class="transaction.test2.dao.StockDaoImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="buyStockService" class="transaction.test2.service.BuyStockServiceImpl">
<property name="accountDao" ref="accountDao"></property>
<property name="stockDao" ref="stockDao"></property>
</bean>
<!-- 事务管理器 -->
<bean id="myTracnsactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 事务代理工厂 -->
<!-- 生成事务代理对象 -->
<bean id="serviceProxy" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager" ref="myTracnsactionManager"></property>
<property name="target" ref="buyStockService"></property>
<property name="transactionAttributes">
<props>
<!-- 主要 key 是方法
ISOLATION_DEFAULT 事务的隔离级别
PROPAGATION_REQUIRED 传播行为
-->
<prop key="add*">ISOLATION_DEFAULT,PROPAGATION_REQUIRED</prop>
<!-- -Exception 表示发生指定异常回滚,+Exception 表示发生指定异常提交 -->
<prop key="buyStock">ISOLATION_DEFAULT,PROPAGATION_REQUIRED,-BuyStockException</prop>
</props>
</property>
</bean>
</beans>
基于 @Transactional 的声明式事务管理
public class BuyStockServiceImpl implements BuyStockService{
private AccountDao accountDao;
private StockDao stockDao;
@Transactional(isolation=Isolation.DEFAULT,propagation=Propagation.REQUIRED)
@Override
public void addAccount(String accountname, double money) {
accountDao.addAccount(accountname,money);
}
@Transactional(isolation=Isolation.DEFAULT,propagation=Propagation.REQUIRED)
@Override
public void addStock(String stockname, int amount) {
stockDao.addStock(stockname,amount);
}
public BuyStockServiceImpl() {
// TODO Auto-generated constructor stub
}
@Transactional(isolation=Isolation.DEFAULT,propagation=Propagation.REQUIRED,rollbackFor=BuyStockException.class)
@Override
public void buyStock(String accountname, double money, String stockname, int amount) throws BuyStockException {
boolean isBuy = true;
accountDao.updateAccount(accountname, money, isBuy);
if(isBuy==true){
throw new BuyStockException("购买股票发生异常");
}
stockDao.updateStock(stockname, amount, isBuy);
}
public AccountDao getAccountDao() {
return accountDao;
}
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
public StockDao getStockDao() {
return stockDao;
}
public void setStockDao(StockDao stockDao) {
this.stockDao = stockDao;
}
}
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 注册数据源 C3P0 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<bean id="accountDao" class="transaction.test3.dao.AccountDaoImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="stockDao" class="transaction.test3.dao.StockDaoImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="buyStockService" class="transaction.test3.service.BuyStockServiceImpl">
<property name="accountDao" ref="accountDao"></property>
<property name="stockDao" ref="stockDao"></property>
</bean>
<!-- 事务管理器 -->
<bean id="myTracnsactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 启用事务注解 -->
<tx:annotation-driven transaction-manager="myTracnsactionManager"/>
4)基于Aspectj AOP配置事务
public class BuyStockServiceImpl implements BuyStockService{
private AccountDao accountDao;
private StockDao stockDao;
@Override
public void addAccount(String accountname, double money) {
accountDao.addAccount(accountname,money);
}
@Override
public void addStock(String stockname, int amount) {
stockDao.addStock(stockname,amount);
}
public BuyStockServiceImpl() {
// TODO Auto-generated constructor stub
}
@Override
public void buyStock(String accountname, double money, String stockname, int amount) throws BuyStockException {
boolean isBuy = true;
accountDao.updateAccount(accountname, money, isBuy);
if(isBuy==true){
throw new BuyStockException("购买股票发生异常");
}
stockDao.updateStock(stockname, amount, isBuy);
}
public AccountDao getAccountDao() {
return accountDao;
}
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
public StockDao getStockDao() {
return stockDao;
}
public void setStockDao(StockDao stockDao) {
this.stockDao = stockDao;
}
}
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 注册数据源 C3P0 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<bean id="accountDao" class="transaction.test4.dao.AccountDaoImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="stockDao" class="transaction.test4.dao.StockDaoImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="buyStockService" class="transaction.test4.service.BuyStockServiceImpl">
<property name="accountDao" ref="accountDao"></property>
<property name="stockDao" ref="stockDao"></property>
</bean>
<!-- 事务管理器 -->
<bean id="myTracnsactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<tx:advice id="txAdvice" transaction-manager="myTracnsactionManager">
<tx:attributes>
<!-- 为连接点指定事务属性 -->
<tx:method name="add*" isolation="DEFAULT" propagation="REQUIRED"/>
<tx:method name="buyStock" isolation="DEFAULT" propagation="REQUIRED" rollback-for="BuyStockException"/>
</tx:attributes>
</tx:advice>
<aop:config>
<!-- 切入点配置 -->
<aop:pointcut expression="execution(* *..service.*.*(..))" id="point"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="point"/>
</aop:config>
来源:CSDN
作者:写完打豆豆
链接:https://blog.csdn.net/baronZhuZhu/article/details/104264110