Easypoi 轻松实现复杂excel文件导出

之前做的excel文件导出都相对简单，用的都是公司自己封装的一些poi方法，导出内容都是表头+一行行的数据，但是这次需要导出的excel复杂度高了不少，自己用现有方法做比较麻烦，因此引入了Easypoi 进行实现。

之所以用Easypoi我是看中了它可以直接根据现有模板填充数据实现excel生成，而模板产品已经给出，那么接下来只需要稍微做修改就能使用，修改后的模板如图：

对照着官方文档的示例（http://easypoi.mydoc.io/#text_226078 ）很容易就能理解模板的使用规则
注意其中的{{$fe: 是遍历listmap变量循环填充数据行，其他则是类似占位符，很好理解

        //代码就纯粹只是把模板的占位符和变量对应起来
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("code", customer.getCode());
        map.put("name", customer.getName());
        map.put("mobile", customer.getMobile());
        map.put("membershipGrade", customer.getMembershipGrade());
        map.put("zzyMembershipGrade", customer.getZzyMembershipGrade());
        map.put("addressComplete", customer.getAddressComplete());
        List<Map<String, String>> listMap = new ArrayList<Map<String, String>>();

        map.put("maplist", listMap);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        for (MainOrderSubOrderFinanceResult financeResult : mainOrderSubOrderFinanceResults) {
            Map<String, String> lm = new HashMap<String, String>();
            lm.put("orderCode", financeResult.getOrderCode());
            lm.put("payStatusDesc", financeResult.getPayStatusDesc());
            lm.put("settlementTypeDesc", financeResult.getSettlementTypeDesc());
            lm.put("billDate", dateFormat.format(financeResult.getBillDate()));
            lm.put("totalAmount", financeResult.getTotalAmount().stripTrailingZeros().toPlainString());
            lm.put("discountAmount", financeResult.getDiscountAmount().stripTrailingZeros().toPlainString());
            lm.put("amount", financeResult.getAmount().stripTrailingZeros().toPlainString());
            lm.put("payAmount", financeResult.getPayAmount().stripTrailingZeros().toPlainString());
            lm.put("amountPaid", financeResult.getAmountPaid().stripTrailingZeros().toPlainString());
            listMap.add(lm);

            sumTotalAmount = sumTotalAmount.add(financeResult.getTotalAmount());
            sumDiscountAmount = sumDiscountAmount.add(financeResult.getDiscountAmount());
            sumAmount = sumAmount.add(financeResult.getAmount());
            sumPayAmount = sumPayAmount.add(financeResult.getPayAmount());
            sumAmountPaid = sumAmountPaid.add(financeResult.getAmountPaid());
        }
        map.put("sumTotalAmount", sumTotalAmount);
        map.put("sumDiscountAmount", sumDiscountAmount);
        map.put("sumAmount", sumAmount);
        map.put("sumPayAmount", sumPayAmount);
        map.put("sumAmountPaid", sumAmountPaid);
        //生成临时模板文件
        String url="";
        try {
            File temp = File.createTempFile("exportCreditBillResult", ".xlsx");
            FileUploadHelper.inputStream2File(this.getClass().getClassLoader().getResourceAsStream("exportCreditBillResult.xlsx"),temp);
            url=temp.getAbsolutePath();
            temp.deleteOnExit();
        } catch (IOException e) {

        }

        TemplateExportParams params = new TemplateExportParams(url);
        Workbook workbook = ExcelExportUtil.exportExcel(params, map);