NPOI 2.4.1
首先去设置下webconfig里面上传文件大小的设置，
<httpRuntime targetFramework="4.5" maxRequestLength="102400" executionTimeout="3600" />,我设置了允许上传最大100M。
话不多说，上MVC 后台代码：
/// <summary>
/// 上传文件，上传实体文件
/// </summary>
/// <param name="httpfile">与前端post的参数名一致</param>
[HttpPost]
public ActionResult UploadExcel(HttpPostedFileBase httpfile)
{
ResultModel rm = new ResultModel();
try
{
DataTable dt = null;
var fileName = httpfile.FileName;
var hz = fileName.Split(‘.‘);
if (hz.Count() > 0 & (hz[1].ToString() == "xlsx" || hz[1].ToString() == "xls"))
{
//NPOI操作excel
using (Stream stream = httpfile.InputStream)
{
Stopwatch sw = new Stopwatch();
sw.Start();
var workbook1 = new XSSFWorkbook(stream);
var sheet = workbook1.GetSheetAt(0);//默认获取第1个sheet
sw.Stop();
TimeSpan t1 = sw.Elapsed;//文件读取耗时
/*excel流文件转为datatable*/
sw.Restart();
dt = RenderFromExcel(sheet, 0);
sw.Stop();
TimeSpan t2 = sw.Elapsed;//转换datatable耗时
LogHelper.Info("条数："+dt.Rows.Count+",文件读取耗时：" + t1 + ",转换datatable耗时：" + t2);
rm.Status = statuslist.成功;
rm.ResultMessage = "文件识别成功！";
}
}
else
{
rm.Status = statuslist.失败;
rm.ResultMessage = "未识别文件类型，请上传正确文件格式！";
//错误
}
}
catch (Exception ex)
{
rm.Status = statuslist.失败;
rm.ResultMessage = ex.Message;
}
JsonResult jr = new JsonResult();
jr.Data = Json(rm);
return jr;
}
上传实体文件
/// <summary>
/// excel转为datatable
/// </summary>
/// <param name="sheet">需要转换的isheet对象</param>
/// <param name="headerRowIndex">表头所在行</param>
/// <returns></returns>
private static DataTable RenderFromExcel(ISheet sheet, int headerRowIndex)
{
DataTable table = new DataTable();
IRow headerRow = sheet.GetRow(headerRowIndex);
int cellCount = headerRow.LastCellNum;//LastCellNum = PhysicalNumberOfCells
int rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1
//handling header.
for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
table.Columns.Add(column);
}
for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
{
IRow row = sheet.GetRow(i);
DataRow dataRow = table.NewRow();
//第一列如果为空，则不添加至datatable中
if (row != null & GetCellValue(row.GetCell(0)) != "")
{
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = GetCellValue(row.GetCell(j));
}
table.Rows.Add(dataRow);
}
}
return table;
}
excel流转datatable
/// <summary>
/// 获取excel单元格类型以及值
/// </summary>
/// <param name="cell"></param>
/// <returns></returns>
private static string GetCellValue(ICell cell)
{
if (cell == null)
return string.Empty;
switch (cell.CellType)
{
case CellType.Blank:
return string.Empty;
case CellType.Boolean:
return cell.BooleanCellValue.ToString();
case CellType.Error:
return cell.ErrorCellValue.ToString();
case CellType.Numeric:
case CellType.Unknown:
default:
return cell.ToString();//This is a trick to get the correct value of the cell. NumericCellValue will return a numeric value no matter the cell value is a date or a number
case CellType.String:
return cell.StringCellValue;
case CellType.Formula:
try
{
XSSFFormulaEvaluator e = new XSSFFormulaEvaluator(cell.Sheet.Workbook);
// HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);
e.EvaluateInCell(cell);
return cell.ToString();
}
catch
{
return cell.NumericCellValue.ToString();
}
}
}
获取单元格类型及赋值
前端代码：
/*上传类型，Stream or File*/
var _type;
/*文件对象*/
var _fileobj;
/*posturl*/
var _posturl;
/*控制的对象*/
var _element = null;
function fileupload(type, fileobj, posturl, element) {
try {
console.log("fileupload");
if (fileobj != null)
_fileobj = fileobj;
if (posturl != null)
_posturl = posturl;
if (element != null)
_element = element;
if (type != null) {
switch (type) {
case "Stream":
{
globalmodal(_element, true);
_type = "Stream";
var file = fileobj;
if (!!file) {
var reader = new FileReader();
/*客户端读取文件，并发送*/
reader.readAsArrayBuffer(file);
reader.onload = function (e) {
var binary = e.target.result;
upload(binary, _posturl);
}
} else
modaldisplay("3", "提示", "文件不能为：" + file);
break;
}
case "File":
{
_type = "File";
if (_element != null)
globalmodal(_element, true);
var formData = new FormData();
formData.append("httpfile", fileobj);
$.ajax({
type: ‘post‘,
url: _posturl,
// 告诉jQuery不要去处理发送的数据
processData: false,
// 告诉jQuery不要去设置Content-Type请求头
contentType: false,
data: formData,
success: function (reponse) {
globalmodal(_element, false);
if (reponse.Data.Status != 1) {
modaldisplay("2", "提示", reponse.Data.ResultMessage);
}
else {
modaldisplay("1", "提示", reponse.Data.ResultMessage);
}
}
});
break;
}
default: {
globalmodal(_element, true);
modaldisplay("3", "文件类型错误提示", "fileupload方法错误！");
}
}
}
else {
modaldisplay("3", "文件类型错误提示", "请填写type！");
}
} catch (e) {
modaldisplay("3", "异常提示", e.message);
}
finally {
}
}
/*发送数据*/
function upload(binary, posturl) {
try {
var xhr = new XMLHttpRequest();
xhr.open("POST", posturl);
xhr.overrideMimeType("application/octet-stream");
if (xhr.sendAsBinary) {
xhr.sendAsBinary(binary);
} else {
xhr.send(binary);
}
/*回调*/
xhr.onload = function (e) {
globalmodal(_element, false);
if (this.status == 200) {
var responsedata = JSON.parse(e.target.response);
modaldisplay("1", "提示", responsedata.Data.ResultMessage);
/*表示成功*/
}
else {
/*失败*/
modaldisplay("3", "提示", "文件处理失败！");
}
}
} catch (e) {
modaldisplay("3", "错误提示", e.message);
}
}
封装了上传文件的方法
调用：
<div class="row" id="fileuploadmodal">
<input type="file" id="file2" />
<input type="button" id="btnupload2" value="上传文件" />
<input type="button" id="btnuploadstream" value="上传流" />
</div>
<script>
/*文件上传*/
$("#btnupload2").on("click", function () {
var filetype = "File";
var file = $("#file2")[0].files[0];
var posturl = "sdm/UploadExcel";
var element = $("#fileuploadmodal");
fileupload(filetype, file, posturl, element);
});
/*流形式*/
$("#btnuploadstream").on("click", function () {
var filetype = "Stream";
var file = $("#file2")[0].files[0];
var posturl = "sdm/UploadExcelStrem";
var element = $("#fileuploadmodal");
fileupload(filetype, file, posturl, element);
});
</script>
页面调用
上传7m左右的文件，耗时25S左右，其中23S在读取文件上，想办法优化下。
原文地址：https://www.cnblogs.com/daniel-niu/p/10614356.html
时间： 2024-11-09 05:25:06