使用EasyExcelListener没有事务的解决办法

在Spring Boot项目中使用 easyexcel 导入excel时，如果选择分批导入数据，因为是用直接new创建的 AnalysisEventListener 的实现类，传入的service或mapper参数来保存到数据库，会出现每次保存都提交了事务，如果后面数据出现了异常，之前批次导入的数据不会回滚。

解决办法

手动管理事务

@Slf4j
public class TransactionalExcelListener<T> extends AnalysisEventListener<T> {

    // 事务管理
    private final DataSourceTransactionManager dataSourceTransactionManager;
    private final TransactionStatus transactionStatus;

    private static final int BATCH_COUNT = 100;

    List<T> dataList = new ArrayList<>();

    private final IService<T> service;

    public TransactionalExcelListener(
            DataSourceTransactionManager dataSourceTransactionManager,
            TransactionDefinition transactionDefinition,
            IService<T> service) {
        this.service= service;

        this.dataSourceTransactionManager = dataSourceTransactionManager;
        DefaultTransactionDefinition definition = new DefaultTransactionDefinition(transactionDefinition);
        // 设置事务隔离级别
        definition.setIsolationLevel(TransactionDefinition.ISOLATION_DEFAULT);
        // 手动开启事务
        this.transactionStatus = dataSourceTransactionManager.getTransaction(definition);
    }

    @Override
    public synchronized void invoke(T rowData, AnalysisContext analysisContext) {
        boolean hasCompleted = transactionStatus.isCompleted();
        // 如果事务已经关闭
        if (hasCompleted) {
            return;
        }
        dataList.add(rowData);

        if (dataList.size() >= BATCH_COUNT) {
            saveData();
        }
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        boolean hasCompleted = transactionStatus.isCompleted();
        if (hasCompleted) {
            return;
        }
        saveData();
        log.info("所有数据解析完成！");
        //提交事务
        dataSourceTransactionManager.commit(transactionStatus);
        log.info("当前事务已提交");
    }

    @Override
    public void onException(Exception exception, AnalysisContext context) throws Exception {
        log.info("导入出现异常，事务回滚");
        dataSourceTransactionManager.rollback(transactionStatus);
    }

    /**
     * 加上存储数据库
     */
    private void saveData() {
        log.info("{}条数据，开始存储数据库！", dataList.size());
        service.saveBatch(dataList);
        log.info("存储数据库成功！");
        dataList.clear();
    }

}