Spring如何基于xml实现声明式事务控制

一、pom.xml

<?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>A02spring</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <!--https://mvnrepository.com/artifact/org.springframework/spring-context--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.2.8.RELEASE</version> </dependency> <!--https://mvnrepository.com/artifact/org.springframework/spring-context--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.8.RELEASE</version> </dependency> <!--https://mvnrepository.com/artifact/org.springframework/spring-context--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.2.8.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.9.6</version> </dependency> <!--https://mvnrepository.com/artifact/org.springframework/spring-context--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.11</version> </dependency> <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.12</version> <scope>provided</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-test --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>5.2.8.RELEASE</version> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/junit/junit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13</version> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration> <source>1.8</source> <target>1.8</target></configuration> </plugin> </plugins> </build></project>

二、spring的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' xmlns:aop='http://www.springframework.org/schema/aop' xmlns:tx='http://www.springframework.org/schema/tx' xsi:schemaLocation=' http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx https://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd'> <bean class='com.wuxi.services.impl.AccountServiceImpl'> <property name='accountDao' ref='accountDao'></property> </bean> <bean class='com.wuxi.daos.impl.AccountDaoImpl'> <property name='dataSource' ref='dataSource'></property> </bean> <bean class='org.springframework.jdbc.datasource.DriverManagerDataSource'> <property name='driverClassName' value='com.mysql.cj.jdbc.Driver'></property> <property name='url' value='jdbc:mysql://192.168.2.105:3306/ssm?characterEncoding=utf8&useSSL=false'></property> <property name='username' value='root'></property> <property name='password' value='123456'></property> </bean><!--spring中基于xml的声明式事务控制配置步骤 1、配置事务管理器 2、配置事务的通知 3、配置aop中的通用切入点表达式 4、建立事务通知和切入点表达式的对应关系 5、配置事务的属性--> <!--事务管理器--> <bean class='org.springframework.jdbc.datasource.DataSourceTransactionManager'> <property name='dataSource' ref='dataSource'></property> </bean> <!--事务的通知--> <tx:advice transaction-manager='transactionManager'> <!-- 事务的属性 isolation：用于指定事务的隔离级别。默认值是DEFAULE，表示使用数据库的默认隔离级别。 propagation：用于指定事务的传播行为。默认值是REQUIRED，表示一定会有事务，增删改的选择。查询方法可以选择SUPPORTYS。 read-only：用于指定事务是否只读。只有查询方法才能设置为true。默认值是false，表示读写。 timeout：用于指定事务的超时时间，默认值是-1，表示永不超时，如果指定了数值，以秒为单位。 rollback-for：用于指定一个异常，当产生该异常时，事务回滚，产生其他异常时，事务不回滚。没有默认值。表示任何异常都回滚。 no-rollback-for：用于指定一个异常，当产生该异常时，事务不回滚，产生其他异常时事务回滚。没有默认值。表示任何异常都回滚。 --> <tx:attributes> <tx:method name='*' propagation='REQUIRED' read-only='false'/> <tx:method name='find*' propagation='SUPPORTS' read-only='true'/> </tx:attributes> </tx:advice> <aop:config> <!--切入点表达式--> <aop:pointcut expression='execution(* com.wuxi.services.*.*(..))'/> <!--切入点表达式和事务通知的对应关系--> <aop:advisor advice-ref='txAdvice' pointcut-ref='ptc'></aop:advisor> </aop:config></beans>

三、实体类

package com.wuxi.beans;import lombok.Data;import java.io.Serializable;@Datapublic class Account implements Serializable { private Integer id; private String name; private Float money;}

四、dao

1、接口

package com.wuxi.daos;import com.wuxi.beans.Account;public interface AccountDao { Account findAccountById(Integer accountId); Account findAccountByName(String accountName); void updateAccount(Account account);}

2、实现类

package com.wuxi.daos.impl;import com.wuxi.beans.Account;import com.wuxi.daos.AccountDao;import org.springframework.jdbc.core.BeanPropertyRowMapper;import org.springframework.jdbc.core.support.JdbcDaoSupport;import java.util.List;public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao { @Override public Account findAccountById(Integer accountId) { List<Account> accounts = getJdbcTemplate().query('select * from account where id = ?', new BeanPropertyRowMapper<Account>(Account.class), accountId); return accounts.isEmpty() ? null : accounts.get(0); } @Override public Account findAccountByName(String accountName) { List<Account> accounts = getJdbcTemplate().query('select * from account where name = ?', new BeanPropertyRowMapper<Account>(Account.class), accountName); if (accounts.isEmpty()) { return null; } if (accounts.size() > 1) { throw new RuntimeException('结果集不唯一'); } return accounts.get(0); } @Override public void updateAccount(Account account) { getJdbcTemplate().update('update account set name=?,money=? where id=?', account.getName(), account.getMoney(), account.getId()); }}

五、service

1、接口

package com.wuxi.services;import com.wuxi.beans.Account;public interface AccountService { Account findAccounById(Integer accountId); void transfer(String sourceName, String targetName, Float money);}

2、实现类

package com.wuxi.services.impl;import com.wuxi.beans.Account;import com.wuxi.daos.AccountDao;import com.wuxi.services.AccountService;public class AccountServiceImpl implements AccountService { private AccountDao accountDao; public void setAccountDao(AccountDao accountDao) { this.accountDao = accountDao; } @Override public Account findAccounById(Integer accountId) { return accountDao.findAccountById(accountId); } @Override public void transfer(String sourceName, String targetName, Float money) { Account source = accountDao.findAccountByName(sourceName); Account target = accountDao.findAccountByName(targetName); source.setMoney(source.getMoney() - money); target.setMoney(target.getMoney() + money); accountDao.updateAccount(source); int i = 1 / 0; accountDao.updateAccount(target); }}

六、测试

package com.wuxi.tests;import com.wuxi.services.AccountService;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = 'classpath:application.xml')public class MySpringTest { @Autowired private AccountService as; @Test public void testTransfer() { as.transfer('aaa', 'bbb', 100f); }}

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