本文是基于纯注解的声明式事务控制，也就是说，没有xml配置文件
项目组织结构如下：
一、pom依赖：
pom.xml
4.0.0
com.zl
spring_day04_transaction_xml
1.0-SNAPSHOT
jar
org.springframework
spring-context
5.0.2.RELEASE
mysql
mysql-connector-java
5.1.6
org.springframework
spring-jdbc
5.0.2.RELEASE
org.springframework
spring-tx
5.0.2.RELEASE
junit
junit
4.12
org.aspectj
aspectjweaver
1.8.13
二、实体类Account:
package com.zl.domain;
import java.io.Serializable;
public class Account implements Serializable {
private Integer id;
private String name;
private Float money;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Float getMoney() {
return money;
}
public void setMoney(Float money) {
this.money = money;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
三、Service层：
com.zl.service.AccountService接口:
package com.zl.service;
public interface AccountService {
/**
* 转账
* @param sourceName 转出账户名称
* @param targetName 转入账户名称
* @param money 转账金额
*/
void transfer(String sourceName,String targetName,Float money);
}
com.zl.service.AccountServiceImpl实现类：
package com.zl.service.impl;
import com.zl.dao.AccountDao;
import com.zl.domain.Account;
import com.zl.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
@Service("accountService")
//只读型
@Transactional(propagation = Propagation.SUPPORTS,readOnly = true)
public class AccountServiceImpl implements AccountService {
@Autowired
private AccountDao accountDao;
//读写型
@Transactional(propagation = Propagation.REQUIRED,readOnly = false)
public void transfer(String sourceName, String targetName, Float money) {
//1.根据名称查询两个账户名称
Account source = accountDao.findAccountByName(sourceName);
Account target = accountDao.findAccountByName(targetName);
//修改两个账户的金额
source.setMoney(source.getMoney()-money);
target.setMoney(target.getMoney()+money);
//3.更新两个账户
accountDao.updateAccount(source);
// int i = 1/0;
accountDao.updateAccount(target);
}
}
四、Dao层：
`com.zl.Dao接口：
package com.zl.dao;
import com.zl.domain.Account;
public interface AccountDao {
/**
* 根据账户名称查询账户
* @param name
* @return
*/
Account findAccountByName(String name);
/**
* 更新账户
* @param account
*/
void updateAccount(Account account);
}
com.zl.dao.impl.AccountDaoImpl实现类：
package com.zl.dao.impl;
import com.zl.dao.AccountDao;
import com.zl.domain.Account;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository("accountDao")
public class AccountDaoImpl implements AccountDao {
@Autowired
private JdbcTemplate jt;
public Account findAccountByName(String name) {
List accounts = jt.query("select * from account where name=?", new BeanPropertyRowMapper(Account.class), name);
if(accounts.isEmpty()){
return null;
}else if(accounts.size()>1){
throw new RuntimeException("根据名称查询得到的结果不唯一...");
}
return accounts.get(0);
}
public void updateAccount(Account account) {
jt.update("update account set money=? where id=?",account.getMoney(),account.getId());
}
}
四、配置类：
conf.MySpringConfiguration主配置类:
package conf;
import org.springframework.context.annotation.*;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@Configuration
@ComponentScan("com.zl")
@Import({JdbcConfig.class,TransactionConfig.class})
@EnableTransactionManagement
@PropertySource("jdbcConfig.properties")
public class MySpringConfiguration {
}
conf.JdbcConfig数据库配置类:
package conf;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import javax.sql.DataSource;
public class JdbcConfig {
@Value("${jdbc.driver}")
private String driver;
@Value("${jdbc.url}")
private String url;
@Value("${jdbc.username}")
private String username;
@Value("${jdbc.password}")
private String password;
@Bean("jt")
public JdbcTemplate createJdbcTemplate(DataSource dataSource){
return new JdbcTemplate(dataSource);
}
@Bean("dataSource")
public DataSource createDatasource(){
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(driver);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
return dataSource;
}
}
conf.TransactionConfig事务配置类:
package conf;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import javax.sql.DataSource;
public class TransactionConfig {
@Bean("transactionManager")
public PlatformTransactionManager createTransactionManager(DataSource dataSource){
return new DataSourceTransactionManager(dataSource);
}
}
五、数据库配置文件:
resources.jdbcConfig.properties：
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring
jdbc.username=root
jdbc.password=root
六、测试类：
写法一：
import com.zl.service.AccountService;
import conf.MySpringConfiguration;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class TestTx {
private ApplicationContext app;
private AccountService accountService;
@Before
public void init(){
app = new AnnotationConfigApplicationContext(MySpringConfiguration.class);
accountService = app.getBean("accountService", AccountService.class);
}
@Test
public void testTransfer(){
accountService.transfer("aaa","bbb",100f);
}
}
写法二：
import com.zl.service.AccountService;
import conf.MySpringConfiguration;
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.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = MySpringConfiguration.class)
public class TestTx2 {
@Autowired
private AccountService accountService;
@Test
public void testTransfer(){
accountService.transfer("aaa","bbb",100f);
}
}
需要注意的是，写法二的junit测试类，需要添加下面一个依赖:
org.aspectj
aspectjweaver
1.8.13