springMVC实现事务管理

        /** 
         * 事务处理必须抛出异常，Spring才会帮助事务回滚 
         * @param users 
         */  
          
        @Transactional  
        @Override  
        public void insertUser(List<User> users) {  
            // TODO Auto-generated method stub  
            for (int i = 0; i < users.size(); i++) {  
                if(i<2){  
                    this.userDao.insert(users.get(i));  
                }  
                else {  
                    throw new RuntimeException();  
                }  
            }  
        }