需求:前后端完全分離的項目,需要一個導出功能,前端使用ant design vue,后端 NetCore5.0
API導出功能:
/// <summary>
/// 導出
/// </summary>
/// <param name="input">篩選條件</param>
/// <returns></returns>
[HttpGet("/ActiveManage/exportExcel")]
public async Task<IActionResult> ExcelDataExprot([FromQuery] ActiveManageInputBySearch input) {
//ExcelActive 類名 根據(jù)不同實體進行導出
//參數(shù)活動管理,導出excel名稱和sheet名稱
// 參數(shù)entities List<ExcelActive >
// 參數(shù)title excel 標題
return await NPOIHelper<ExcelActive>.ExcelDataExprot("活動管理", entities,title);
}

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NPOI導出公共類:
namespace Furion.Extras.Admin.NET.Application
{
public class NPOIHelper<T> where T:class
{
public static async Task<IActionResult> ExcelDataExprot(string tablename,List<T> list,List<string> ExcelTitle) {
try {
//創(chuàng)建Excel文件對象
var workbook = new HSSFWorkbook();
//創(chuàng)建工作表sheet0
var sheet = workbook.CreateSheet(tablename);
//設(shè)置頂部大標題樣式
var TitleCellStyleFont = NpoiExcelExportHelper._.CreateStyle(workbook,HorizontalAlignment.Center,VerticalAlignment.Center,20,true,700,"楷體", true, false, false, true, FillPattern.SolidForeground, HSSFColor.Coral.Index, HSSFColor.White.Index,
FontUnderlineType.None, FontSuperScript.None, false);
//第一行表單
var row = NpoiExcelExportHelper._.CreateRow(sheet, 0, 28);
var cell = row.CreateCell(0);
//合并單元格 例: 第1行到第2行 第3列到第4列圍成的矩形區(qū)域
//TODO:關(guān)于Excel行列單元格合并問題
/**
第一個參數(shù):從第幾行開始合并
第二個參數(shù):到第幾行結(jié)束合并
第三個參數(shù):從第幾列開始合并
第四個參數(shù):到第幾列結(jié)束合并
**/
CellRangeAddress region = new CellRangeAddress(0, 0, 0, ExcelTitle.Count()-1);
sheet.AddMergedRegion(region);
cell.SetCellValue(tablename);//合并單元格后,只需對第一個位置賦值即可(TODO:頂部標題)
cell.CellStyle = TitleCellStyleFont;
//二級標題列樣式設(shè)置
var headTopStyle = NpoiExcelExportHelper._.CreateStyle(workbook, HorizontalAlignment.Center, VerticalAlignment.Center, 15, true, 700, "楷體", true, false, false, true, FillPattern.SolidForeground, HSSFColor.Grey25Percent.Index, HSSFColor.Black.Index,
FontUnderlineType.None, FontSuperScript.None, false);
//表頭名稱
var headerName = list[0];
row = NpoiExcelExportHelper._.CreateRow(sheet, 1, 24);//第二行
for(int i=0;i< ExcelTitle.Count;i++) {
cell = NpoiExcelExportHelper._.CreateCells(row, headTopStyle, i, ExcelTitle[i]);
//設(shè)置單元格寬度
sheet.SetColumnWidth(i, 7000);
}
#region 單元格內(nèi)容信息
//單元格邊框樣式
var cellStyle = NpoiExcelExportHelper._.CreateStyle(workbook, HorizontalAlignment.Center, VerticalAlignment.Center, 10, true, 400);
//左側(cè)列單元格合并 begin
//TODO:關(guān)于Excel行列單元格合并問題(合并單元格后,只需對第一個位置賦值即可)
/**
第一個參數(shù):從第幾行開始合并
第二個參數(shù):到第幾行結(jié)束合并
第三個參數(shù):從第幾列開始合并
第四個參數(shù):到第幾列結(jié)束合并
**/
for (var i = 0; i < list.Count(); i++)
{
row = NpoiExcelExportHelper._.CreateRow(sheet, i + 2, 20); //sheet.CreateRow(i+2);//在上面表頭的基礎(chǔ)上創(chuàng)建行
int y = 0;
foreach (System.Reflection.PropertyInfo p in list[i].GetType().GetProperties())
{
cell = NpoiExcelExportHelper._.CreateCells(row, cellStyle, y, p.GetValue(list[i]) != null ? p.GetValue(list[i]).ToString() : null);
y++;
}
}
#endregion
//excel保存文件名
string excelFileName = tablename + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls";
//將Excel表格轉(zhuǎn)化為流,輸出
MemoryStream bookStream = new MemoryStream();//創(chuàng)建文件流
workbook.Write(bookStream); //文件寫入流(向流中寫入字節(jié)序列)
bookStream.Seek(0, SeekOrigin.Begin);//輸出之前調(diào)用Seek,把0位置指定為開始位置
return await Task.FromResult(new FileStreamResult(bookStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
{
FileDownloadName =excelFileName
});
}
catch (Exception e)
{
return null;
}
}
}
public class NpoiExcelExportHelper
{
private static NpoiExcelExportHelper _exportHelper;
public static NpoiExcelExportHelper _
{
get => _exportHelper ?? (_exportHelper = new NpoiExcelExportHelper());
set => _exportHelper = value;
}
/// <summary>
/// TODO:先創(chuàng)建行,然后在創(chuàng)建對應(yīng)的列
/// 創(chuàng)建Excel中指定的行
/// </summary>
/// <param name="sheet">Excel工作表對象</param>
/// <param name="rowNum">創(chuàng)建第幾行(從0開始)</param>
/// <param name="rowHeight">行高</param>
public HSSFRow CreateRow(ISheet sheet, int rowNum, float rowHeight)
{
HSSFRow row = (HSSFRow)sheet.CreateRow(rowNum); //創(chuàng)建行
row.HeightInPoints = rowHeight; //設(shè)置列頭行高
return row;
}
/// <summary>
/// 創(chuàng)建行內(nèi)指定的單元格
/// </summary>
/// <param name="row">需要創(chuàng)建單元格的行</param>
/// <param name="cellStyle">單元格樣式</param>
/// <param name="cellNum">創(chuàng)建第幾個單元格(從0開始)</param>
/// <param name="cellValue">給單元格賦值</param>
/// <returns></returns>
public HSSFCell CreateCells(HSSFRow row, HSSFCellStyle cellStyle, int cellNum, string cellValue)
{
HSSFCell cell = (HSSFCell)row.CreateCell(cellNum); //創(chuàng)建單元格
cell.CellStyle = cellStyle; //將樣式綁定到單元格
if (!string.IsNullOrWhiteSpace(cellValue))
{
//單元格賦值
cell.SetCellValue(cellValue);
}
return cell;
}
/// <summary>
/// 行內(nèi)單元格常用樣式設(shè)置
/// </summary>
/// <param name="workbook">Excel文件對象</param>
/// <param name="hAlignment">水平布局方式</param>
/// <param name="vAlignment">垂直布局方式</param>
/// <param name="fontHeightInPoints">字體大小</param>
/// <param name="isAddBorder">是否需要邊框</param>
/// <param name="boldWeight">字體加粗 (None = 0,Normal = 400,Bold = 700</param>
/// <param name="fontName">字體(仿宋,楷體,宋體,微軟雅黑...與Excel主題字體相對應(yīng))</param>
/// <param name="isAddBorderColor">是否增加邊框顏色</param>
/// <param name="isItalic">是否將文字變?yōu)樾斌w</param>
/// <param name="isLineFeed">是否自動換行</param>
/// <param name="isAddCellBackground">是否增加單元格背景顏色</param>
/// <param name="fillPattern">填充圖案樣式(FineDots 細點,SolidForeground立體前景,isAddFillPattern=true時存在)</param>
/// <param name="cellBackgroundColor">單元格背景顏色(當isAddCellBackground=true時存在)</param>
/// <param name="fontColor">字體顏色</param>
/// <param name="underlineStyle">下劃線樣式(無下劃線[None],單下劃線[Single],雙下劃線[Double],會計用單下劃線[SingleAccounting],會計用雙下劃線[DoubleAccounting])</param>
/// <param name="typeOffset">字體上標下標(普通默認值[None],上標[Sub],下標[Super]),即字體在單元格內(nèi)的上下偏移量</param>
/// <param name="isStrikeout">是否顯示刪除線</param>
/// <returns></returns>
public HSSFCellStyle CreateStyle(HSSFWorkbook workbook, HorizontalAlignment hAlignment, VerticalAlignment vAlignment, short fontHeightInPoints, bool isAddBorder, short boldWeight, string fontName = "宋體", bool isAddBorderColor = true, bool isItalic = false, bool isLineFeed = false, bool isAddCellBackground = false, FillPattern fillPattern = FillPattern.NoFill, short cellBackgroundColor = HSSFColor.Yellow.Index, short fontColor = HSSFColor.Black.Index, FontUnderlineType underlineStyle =
FontUnderlineType.None, FontSuperScript typeOffset = FontSuperScript.None, bool isStrikeout = false)
{
HSSFCellStyle cellStyle = (HSSFCellStyle)workbook.CreateCellStyle(); //創(chuàng)建列頭單元格實例樣式
cellStyle.Alignment = hAlignment; //水平居中
cellStyle.VerticalAlignment = vAlignment; //垂直居中
cellStyle.WrapText = isLineFeed;//自動換行
//背景顏色,邊框顏色,字體顏色都是使用 HSSFColor屬性中的對應(yīng)調(diào)色板索引,關(guān)于 HSSFColor 顏色索引對照表,詳情參考:https://www.cnblogs.com/Brainpan/p/5804167.html
//TODO:引用了NPOI后可通過ICellStyle 接口的 FillForegroundColor 屬性實現(xiàn) Excel 單元格的背景色設(shè)置,F(xiàn)illPattern 為單元格背景色的填充樣式
//TODO:十分注意,要設(shè)置單元格背景色必須是FillForegroundColor和FillPattern兩個屬性同時設(shè)置,否則是不會顯示背景顏色
if (isAddCellBackground)
{
cellStyle.FillForegroundColor = cellBackgroundColor;//單元格背景顏色
cellStyle.FillPattern = fillPattern;//填充圖案樣式(FineDots 細點,SolidForeground立體前景)
}
//是否增加邊框
if (isAddBorder)
{
//常用的邊框樣式 None(沒有),Thin(細邊框,瘦的),Medium(中等),Dashed(虛線),Dotted(星羅棋布的),Thick(厚的),Double(雙倍),Hair(頭發(fā))[上右下左順序設(shè)置]
cellStyle.BorderBottom = BorderStyle.Thin;
cellStyle.BorderRight = BorderStyle.Thin;
cellStyle.BorderTop = BorderStyle.Thin;
cellStyle.BorderLeft = BorderStyle.Thin;
}
//是否設(shè)置邊框顏色
if (isAddBorderColor)
{
//邊框顏色[上右下左順序設(shè)置]
cellStyle.TopBorderColor = HSSFColor.DarkGreen.Index;//DarkGreen(黑綠色)
cellStyle.RightBorderColor = HSSFColor.DarkGreen.Index;
cellStyle.BottomBorderColor = HSSFColor.DarkGreen.Index;
cellStyle.LeftBorderColor = HSSFColor.DarkGreen.Index;
}
/**
* 設(shè)置相關(guān)字體樣式
*/
var cellStyleFont = (HSSFFont)workbook.CreateFont(); //創(chuàng)建字體
//假如字體大小只需要是粗體的話直接使用下面該屬性即可
//cellStyleFont.IsBold = true;
cellStyleFont.Boldweight = boldWeight; //字體加粗
cellStyleFont.FontHeightInPoints = fontHeightInPoints; //字體大小
cellStyleFont.FontName = fontName;//字體(仿宋,楷體,宋體 )
cellStyleFont.Color = fontColor;//設(shè)置字體顏色
cellStyleFont.IsItalic = isItalic;//是否將文字變?yōu)樾斌w
cellStyleFont.Underline = underlineStyle;//字體下劃線
cellStyleFont.TypeOffset = typeOffset;//字體上標下標
cellStyleFont.IsStrikeout = isStrikeout;//是否有刪除線
cellStyle.SetFont(cellStyleFont); //將字體綁定到樣式
return cellStyle;
}
}
}