Spring注解驱动开发四纯注解实现声明式事务(无xml)

@EnableTransactionManagement
@ComponentScan("com.web.tx")
@Configuration
public class TxConfig {
  //数据源
  @Bean
  public DataSource dataSource() throws Exception{
    ComboPooledDataSource dataSource = new ComboPooledDataSource();
    dataSource.setUser("root");
    dataSource.setPassword("123456");
    dataSource.setDriverClass("com.mysql.jdbc.Driver");
    dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
    return dataSource;
  }
  //
  @Bean
  public JdbcTemplate jdbcTemplate() throws Exception{
    //Spring对@Configuration类会特殊处理；给容器中加组件的方法，多次调用都只是从容器中找组件
    JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource());
    return jdbcTemplate;
  }
  //注册事务管理器在容器中
  @Bean
  public PlatformTransactionManager transactionManager() throws Exception{
    return new DataSourceTransactionManager(dataSource());
  }
}

<tx:annotation-driven/>

@Repository
public class UserDao {
  @Autowired
  private JdbcTemplate jdbcTemplate;
  public void insert(){
    String sql = "INSERT INTO `tbl_user`(username,age) VALUES(?,?)";
    String username = UUID.randomUUID().toString().substring(0, 5);
    jdbcTemplate.update(sql, username,19);
  }
}

@S@Service
public class UserService2 {
  @Autowired
  private UserDao userDao;
  @Transactional
  public void insertUser(){
    userDao.insert();
    //otherDao.other();xxx
    System.out.println("插入完成...");
    int i = 10/0;//这里人为抛出异常，测试事务
  }
}

public class IOCTest_Tx {
  @Test
  public void test01(){
    AnnotationConfigApplicationContext applicationContext = 
        new AnnotationConfigApplicationContext(TxConfig.class);
    UserService2 userService = applicationContext.getBean(UserService2.class);
    userService.insertUser();
    applicationContext.close();
  }
}