springboot @Transaction 回滚事务，并且捕获异常

直接冲：

service 层
@Transactional(rollbackFor = Exception.class)
public void a(String a,String b,String c) throws Exception {
//查找默认计算
userDao.update(a);
//修改订单的状态
orderDao.add(b);
//添加到流转信息
flowService.select©;

}

controll层
public Strring add(String a,String b,String c){
try {
orderService.a(a,b,c)
return “成功！”;
} catch (Exception e) {
return “失败”;
}
}