csharp Excel文件构造函数C＃

Posted 2021-05-12

using System;
using System.Collections.Generic;

namespace Barcelo.API.FileGenerator.Models
{
    public class ExcelStructure
    {
        public List<String> header { get; set; }
        public List<string[]> body { get; set; }
    }
}

using System;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Net.Http.Headers;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;

namespace Barcelo.API.FileGenerator.Controllers
{
    public class ExcelController : ApiController
    {
        private const string FILENAME = "document";
        private const string FILEEXTENSION = "xlsx";

        [HttpPost]
        [Route("api/excel")]
        public HttpResponseMessage Post([FromBody]Models.ExcelStructure json)
        {
            string tempFileName = Guid.NewGuid().ToString();
            string path = String.Format("{0}\\{1}.{2}", Path.GetTempPath(), tempFileName, FILEEXTENSION);

            try
            {
                IWorkbook workbook = new XSSFWorkbook();
                ISheet sheet1 = workbook.CreateSheet("Sheet1");
                IRow rowHeader = sheet1.CreateRow(0);

                IFont font = (XSSFFont)workbook.CreateFont();
                font.IsBold = true;

                ICellStyle style = (XSSFCellStyle)workbook.CreateCellStyle();
                style.SetFont(font);

                for (int i = 0; i < json.header.Count; i++)
                {
                    ICell cell = rowHeader.CreateCell(i);
                    cell.CellStyle = style;
                    cell.SetCellValue(json.header[i]);
                }

                for (int i = 0; i < json.body.Count; i++)
                {
                    IRow row = sheet1.CreateRow(1 + i);
                    for (int j = 0; j < json.body[i].Length; j++)
                    {
                        ICell cell = row.CreateCell(j);
                        cell.SetCellValue(json.body[i][j].ToString());
                    }
                }

                FileStream fs = File.Create(path);
                workbook.Write(fs);

                HttpResponseMessage result = Request.CreateResponse(HttpStatusCode.OK);

                using (fs = File.OpenRead(path))
                {
                    MemoryStream ms = new MemoryStream();
                    ms.SetLength(fs.Length);
                    fs.Read(ms.GetBuffer(), 0, (int)fs.Length);

                    result.Content = new StreamContent(ms);
                    result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                    result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
                    {
                        FileName = $"{FILENAME}.{FILEEXTENSION}"
                    };
                }

                fs.Close();
                File.Delete(path);

                return result;
            }
            catch (Exception e)
            {
                throw;
            }
        }
    }
}