Ali-EasyExcel import verification

Import the corresponding entity class:

@Data
public class ReqCustomerDailyImport {
    /**
     * 客户名称
     */
    @ExcelProperty(index = 0)
    private String customerName;

    /**
     * MIS编码
     */
    @ExcelProperty(index = 1)
    private String misCode;

    /**
     * 月度滚动额
     */
    @ExcelProperty(index = 3)
    private BigDecimal monthlyQuota;

    /**
     * 最新应收账款余额
     */
    @ExcelProperty(index = 4)
    private BigDecimal accountReceivableQuota;

    /**
     * 本月利率(年化）
     */
    @ExcelProperty(index = 5)
    private BigDecimal dailyInterestRate;
}

Controller：

@PostMapping("/import")
public void importCustomerDaily(@RequestParam MultipartFile file) throws IOException {
    InputStream inputStream = file.getInputStream();
    List<ReqCustomerDailyImport> reqCustomerDailyImports = EasyExcel.read(inputStream)
            .head(ReqCustomerDailyImport.class)
            // 设置sheet,默认读取第一个
            .sheet()
            // 设置标题所在行数
            .headRowNumber(2)
            .doReadSync();
}

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It can be seen that you only need to use the @ExcelProperty annotation on the entity object, specify the class when reading, and it can be read and automatically

Empty lines are filtered, and the reading of excel is extremely simple. However, I found a problem at this time, so what should I do if I want to verify the field

manage? What about converting a field type to another type?

Don't worry, the author must have considered the problems we can think of, here is a demo

List<ReqCustomerDailyImport> reqCustomerDailyImports = EasyExcel.read(inputStream)
            // 这个转换是成全局的， 所有java为string,excel为string的都会用这个转换器。
            // 如果就想单个字段使用请使用@ExcelProperty 指定converter
            .registerConverter(new StringConverter())
            // 注册监听器，可以在这里校验字段
            .registerReadListener(new CustomerDailyImportListener())
            .head(ReqCustomerDailyImport.class)
            .sheet()
            .headRowNumber(2)
            .doReadSync();
}

Listener: 

public class CustomerDailyImportListener extends AnalysisEventListener {

    List misCodes = Lists.newArrayList();

    /**
     * 每解析一行，回调该方法
     * @param data
     * @param context
     */
    @Override
    public void invoke(Object data, AnalysisContext context) {
        String misCode = ((ReqCustomerDailyImport) data).getMisCode();
        if (StringUtils.isEmpty(misCode)) {
            throw new RuntimeException(String.format("第%s行MIS编码为空，请核实", context.readRowHolder().getRowIndex() + 1));
        }
        if (misCodes.contains(misCodes)) {
            throw new RuntimeException(String.format("第%s行MIS编码已重复，请核实", context.readRowHolder().getRowIndex() + 1));
        } else {
            misCodes.add(misCode);
        }
    }

    /**
     * 出现异常回调
     * @param exception
     * @param context
     * @throws Exception
     */
    @Override
    public void onException(Exception exception, AnalysisContext context) throws Exception {
        // ExcelDataConvertException:当数据转换异常的时候，会抛出该异常，此处可以得知第几行，第几列的数据
        if (exception instanceof ExcelDataConvertException) {
            Integer columnIndex = ((ExcelDataConvertException) exception).getColumnIndex() + 1;
            Integer rowIndex = ((ExcelDataConvertException) exception).getRowIndex() + 1;
            String message = "第" + rowIndex + "行，第" + columnIndex + "列" + "数据格式有误，请核实";
            throw new RuntimeException(message);
        } else if (exception instanceof RuntimeException) {
            throw exception;
        } else {
            super.onException(exception, context);
        }
    }

    /**
     * 解析完全部回调
     * @param context
     */
    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        misCodes.clear();
    }
}

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