使用NPOI导出Excel文件

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使用NPOI导出Excel文件，本实例使用了ASP.NET MVC。

1、使用NPOI导出Excel文件

实例：导出商品列表。

要求：1、通过NPOI导出导出商品列表信息；

2、使用Excel函数计算商品总金额；

在Controllers控制器目录中创建ExportController.cs控制器

using System.IO;
using NPOI;
using NPOI.POIFS;
using NPOI.HSSF;
using NPOI.Util;
using NPOI.HSSF.UserModel;
using NPOI.HPSF;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.HSSF.Util;

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/// <summary>
/// 导出商品列表
/// </summary>
public FileResult ExportProduct()
{
    //创建一个新的xls文件
    HSSFWorkbook workbook = new HSSFWorkbook();

    //创建DocumentSummaryInformation（选填）
    DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
    dsi.Company = "深圳市电子商务有限公司";
    dsi.Category = "报表";
    //创建SummaryInformation（选填）
    SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
    si.Subject = "商品列表";
    si.Title = "商品列表导出";
    si.Author = "Kevin Pan";
    //把创建好的对象赋给Workbook
    workbook.DocumentSummaryInformation = dsi;
    workbook.SummaryInformation = si;

    //创建一个Sheet
    ISheet sheet = workbook.CreateSheet("Sheet1");
    sheet.DefaultRowHeight = 300;
    //创建标题
    IRow rowTitle = sheet.CreateRow(0);
    rowTitle.Height = 500;
    ICellStyle styleTitle = workbook.CreateCellStyle();
    styleTitle.Alignment = HorizontalAlignment.Center;
    styleTitle.VerticalAlignment = VerticalAlignment.Center;
    IFont fontTitle = workbook.CreateFont();
    fontTitle.FontName = "宋体";
    fontTitle.FontHeightInPoints = 18;
    styleTitle.SetFont(fontTitle);
    ICell cellTitle = rowTitle.CreateCell(0);
    cellTitle.SetCellValue("商品列表");
    cellTitle.CellStyle = styleTitle;
    sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, 5));  //合并单元格
    //创建表格样式
    IFont font = workbook.CreateFont();
    font.FontName = "宋体";
    font.FontHeightInPoints = 10;
    ICellStyle style = workbook.CreateCellStyle(); ;
    style.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
    style.BottomBorderColor = HSSFColor.Black.Index;
    style.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
    style.LeftBorderColor = HSSFColor.Black.Index;
    style.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
    style.RightBorderColor = HSSFColor.Black.Index;
    style.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
    style.TopBorderColor = HSSFColor.Black.Index;
    style.Alignment = HorizontalAlignment.Center;
    style.SetFont(font);
    //创建表头
    IRow rowHead = sheet.CreateRow(1);
    rowHead.CreateCell(0).SetCellValue("序号");
    rowHead.GetCell(0).CellStyle = style;
    sheet.SetColumnWidth(0, 256 * 5);

    rowHead.CreateCell(1).SetCellValue("商品名称");
    rowHead.GetCell(1).CellStyle = style;
    sheet.SetColumnWidth(1, 256 * 25);

    rowHead.CreateCell(2).SetCellValue("商品品牌");
    rowHead.GetCell(2).CellStyle = style;
    sheet.SetColumnWidth(2, 256 * 20);

    rowHead.CreateCell(3).SetCellValue("商品价格");
    rowHead.GetCell(3).CellStyle = style;
    sheet.SetColumnWidth(3, 256 * 15);

    rowHead.CreateCell(4).SetCellValue("数量");
    rowHead.GetCell(4).CellStyle = style;
    sheet.SetColumnWidth(3, 256 * 10);

    rowHead.CreateCell(5).SetCellValue("总金额");
    rowHead.GetCell(5).CellStyle = style;
    sheet.SetColumnWidth(3, 256 * 15);

    //获取商品列表数据
    List<ProductModel> dataList = GetProductList();
    //绑定表内容
    int rowindex = 2;
    int xh = 1;
    foreach (var item in dataList)
    {
        IRow rowContent = sheet.CreateRow(rowindex);
        rowContent.CreateCell(0).SetCellValue(xh);
        rowContent.GetCell(0).CellStyle = style;

        rowContent.CreateCell(1).SetCellValue(item.ProductName);
        rowContent.GetCell(1).CellStyle = style;

        rowContent.CreateCell(2).SetCellValue(item.ProductBrand);
        rowContent.GetCell(2).CellStyle = style;

        rowContent.CreateCell(3).SetCellValue(item.ProductPrice.ToString());
        rowContent.GetCell(3).CellStyle = style;

        rowContent.CreateCell(4).SetCellValue(item.Quantity.ToString());
        rowContent.GetCell(4).CellStyle = style;
        //设置函数，计算总金额
        rowContent.CreateCell(5).SetCellFormula(String.Format("$D{0}*$E{0}", rowindex+1));
        rowContent.GetCell(5).CellStyle = style;

        rowindex++;
        xh++;
    }

    //输出 
    System.IO.MemoryStream ms = new System.IO.MemoryStream();
    workbook.Write(ms);
    ms.Seek(0, SeekOrigin.Begin);
    return File(ms, "application/vnd.ms-excel", "商品列表.xls");
}

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2、基于.xls模板导出Excel文件

实例：基于.xls模板导出订单信息（如图 1）

要求：1、使用基于.xls模板导出订单信息；

2、使用Excel函数计算订单和商品的总金额；

图 1 基于.xls模板导出订单信息

/// <summary>
/// 导出订单信息
/// </summary>
public FileResult ExportOrder()
{ 
    //获取订单信息
    OrderModel order = GetOrderInfo();
    //获取Excel模板
    string fileName = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/Template/order.xls";
    FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.Read);
    //通过模板创建一个xls文件
    HSSFWorkbook workbook = new HSSFWorkbook(file);
    //获取Sheet
    ISheet sheet = workbook.GetSheet("Sheet1");
    //导出订单信息
    sheet.GetRow(1).CreateCell(1).SetCellValue(order.OrderNo);
    sheet.GetRow(1).CreateCell(3).SetCellValue(order.OrderTime.ToString("yyyy-MM-dd HH:mm:ss"));
    sheet.GetRow(1).CreateCell(5).SetCellFormula("SUM(F6:F100)"); //设置函数，计算订单总金额
    sheet.GetRow(2).CreateCell(1).SetCellValue(order.CustomName);
    sheet.GetRow(2).CreateCell(3).SetCellValue(order.CustomAddress);
    //导出产品列表
    if (order.ProductList != null && order.ProductList.Count > 0)
    {
        //创建表头
        IRow rowHead = sheet.CreateRow(4);
        rowHead.CreateCell(0).SetCellValue("序号");
        sheet.SetColumnWidth(0, 256 * 15);

        rowHead.CreateCell(1).SetCellValue("商品名称");
        sheet.SetColumnWidth(1, 256 * 25);

        rowHead.CreateCell(2).SetCellValue("商品品牌");
        sheet.SetColumnWidth(2, 256 * 20);

        rowHead.CreateCell(3).SetCellValue("商品价格");
        sheet.SetColumnWidth(3, 256 * 15);

        rowHead.CreateCell(4).SetCellValue("数量");
        sheet.SetColumnWidth(3, 256 * 10);

        rowHead.CreateCell(5).SetCellValue("总金额");
        sheet.SetColumnWidth(3, 256 * 15);

        //绑定表内容
        int rowindex = 5;
        int xh = 1;
        foreach (var item in order.ProductList)
        {
            IRow rowContent = sheet.CreateRow(rowindex);
            rowContent.CreateCell(0).SetCellValue(xh);
            rowContent.CreateCell(1).SetCellValue(item.ProductName);
            rowContent.CreateCell(2).SetCellValue(item.ProductBrand);
            rowContent.CreateCell(3).SetCellValue(item.ProductPrice.ToString());
            rowContent.CreateCell(4).SetCellValue(item.Quantity.ToString());
            rowContent.CreateCell(5).SetCellFormula(String.Format("$D{0}*$E{0}", rowindex + 1));  //设置函数，计算总金额
            rowindex++;
            xh++;
        }
    }

    //输出 
    System.IO.MemoryStream ms = new System.IO.MemoryStream();
    workbook.Write(ms);
    ms.Seek(0, SeekOrigin.Begin);
    return File(ms, "application/vnd.ms-excel", "订单信息.xls");
}

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3、其他代码

3.1 实体类

在Models模型目录中创建ProductModel.cs和OrderModel.cs实体类

/// <summary>
/// 商品信息实体类
/// </summary>
public class ProductModel
{
    /// <summary>
    /// 商品名称
    /// </summary>
    public string ProductName { get; set; }

    /// <summary>
    /// 商品品牌
    /// </summary>
    public string ProductBrand { get; set; }

    /// <summary>
    /// 商品价格
    /// </summary>
    public decimal ProductPrice { get; set; }

    /// <summary>
    /// 数量
    /// </summary>
    public int Quantity { get; set; }
}

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/// <summary>
/// 订单信息实体类
/// </summary>
public class OrderModel
{
    /// <summary>
    /// 订单编号
    /// </summary>
    public string OrderNo { get; set; }

    /// <summary>
    /// 下单时间
    /// </summary>
    public DateTime OrderTime { get; set; }

    /// <summary>
    /// 总金额
    /// </summary>
    public decimal Amount { get; set; }

    /// <summary>
    /// 客户名称
    /// </summary>
    public string CustomName { get; set; }

    /// <summary>
    /// 客户地址
    /// </summary>
    public string CustomAddress { get; set; }

    /// <summary>
    /// 商品列表
    /// </summary>
    public List<ProductModel> ProductList { get; set; }
}

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3.2 获取商品和订单数据

/// <summary>
/// 获取商品列表
/// </summary>
public List<ProductModel> GetProductList()
{
    List<ProductModel> productList = new List<ProductModel>();
    ProductModel product1 = new ProductModel(){
        ProductName = "苹果IPhone6手机",
        ProductBrand = "苹果",
        ProductPrice = 4999,
        Quantity = 4
    };
    ProductModel product2 = new ProductModel()
    {
        ProductName = "三星智能手机",
        ProductBrand = "三星",
        ProductPrice = 3800,
        Quantity = 3
    };
    ProductModel product3 = new ProductModel()
    {
        ProductName = "松下液晶电视机",
        ProductBrand = "松下",
        ProductPrice = 3800,
        Quantity = 2
    };
    productList.Add(product1);
    productList.Add(product2);
    productList.Add(product3);
    return productList;
}

/// <summary>
/// 获取订单信息
/// </summary>
public OrderModel GetOrderInfo()
{
    OrderModel order = new OrderModel() { 
        OrderNo = "P20140929001",
        OrderTime = DateTime.Now,
        CustomName = "张三",
        CustomAddress = "广东省深圳市罗湖区",
        ProductList = GetProductList()
    };
    return order;
}

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3.3 视图

在Views视图目录中创建Index.cshtml

<h2>使用NPOI生成Excel文件</h2>
<a href="@Url.Action("ExportProduct","Export")">导出商品</a>
<a href="@Url.Action("ExportOrder","Export")">导出订单</a>

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