主要是使用C# .Net 7.0 Core Webapi接口，通过调用这个接口，将文件上传到服务器，并读取文件，返回文件的数据
文章目录
代码
FileController-文件控制类
csharp
using HS_Marketing_Department_BI_Backend.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System.Data;
namespace HS_Marketing_Department_BI_Backend.Controllers
{
/// <summary>
/// 文件控制器
/// </summary>
//[Authorize]
[Route("[controller]")]
[ApiController]
public class FileController : ControllerBase
{
//日志
private readonly ILogger<FileController> _logger;
private string return_json;
private ReturnData returnData;
private string exStr;
public FileController(ILogger<FileController> logger)
{
_logger = logger;
}
/// <summary>
/// 文件上传接口
/// </summary>
/// <returns>返回结果</returns>
[HttpPost("UploadFile")]
public async Task<IActionResult> UploadFile(IFormFile file, string tableName)
{
string ext;
char status;
var savePath = Path.Combine(Directory.GetCurrentDirectory(), "uploads", file.FileName);
var path = Path.Combine(Directory.GetCurrentDirectory(), "uploads");
if (file == null || file.Length == 0)
return BadRequest("No file uploaded.");
//.txt,T && T
//.XLSX T %% F
//.XLS F && T
ext = Path.GetExtension(file.FileName).ToLower();
if (ext != ".xlsx" && ext != ".xls")
{
//写入日志
_logger.LogError("请选择导入文件为.xlsx的后缀名!");
//返回
return StatusCode(400, new { code = "E", msg = "请选择导入文件为.xlsx的后缀名!", data = "" });
}
try
{
//如果路径不存在
if (!Directory.Exists(path))
{
//创建路径
Directory.CreateDirectory(path);
}
using (var stream = new FileStream(savePath, FileMode.Create))
{
IWorkbook workbook;
//异步将上传文件的内容复制到stream流中。程序会暂停当前方法的执行，把线程释放去处理其他请求
await file.CopyToAsync(stream);
stream.Position = 0; // 关键：重置流位置到文件开头，否则EOF in header
//根据文件流创建excel数据结构
if (ext == ".xlsx")
{
workbook = new XSSFWorkbook(stream); // .xlsx 文件
}
else
{
workbook = new HSSFWorkbook(stream); //.xls文件
}
//导入文件，读取表格内容
returnData = ExcelImportUtil.Import(workbook, tableName, out status);
}
}
catch (Exception ex)
{
exStr = "文件读取异常。请检查文件格式或者是否是加密文档，仅支持解密文档；异常消息：" + ex.Message;
//写入日志
_logger.LogError(exStr);
//报500错误
return StatusCode(500, new { code = "E", msg = exStr, data = "" });
}
return_json = JsonConvert.SerializeObject(returnData);
if (returnData.code == "S") //读取成功
{
_logger.LogInformation(return_json); //写入日志
return Ok(new { code = returnData.code, msg = returnData.msg, data = returnData.data });
}
else //读取失败
{
_logger.LogError(return_json); //写入日志
return Ok(new { code = returnData.code, msg = returnData.msg, data = returnData.data });
}
}
/// <summary>
/// 文件保存接口
/// </summary>
/// <returns>返回结果</returns>
[HttpPost("SaveFile")]
public IActionResult SaveFile(List<TestModel> tests, string tableName)
{
ReturnData returnData = new ReturnData();
string return_json;
string data;
try
{
switch (tableName)
{
case "test":
returnData = TestBLL.SaveTestTable(tests, tableName);
break;
}
return_json = JsonConvert.SerializeObject(returnData);
}
catch (Exception ex)
{
exStr = $"保存失败。异常消息：{ex.Message}";
_logger.LogError(exStr);
return StatusCode(500, new { code = "E", msg = exStr, data = "" });
}
if (returnData.code == "S")
{
_logger.LogInformation(return_json);
return Ok(new { code = returnData.code, msg = returnData.msg, data = returnData.data });
}
else
{
_logger.LogError(return_json);
return Ok(new { code = returnData.code, msg = returnData.msg, data = returnData.data });
}
}
}
}ExcelImportUtil-Excel文件导入工具类
csharp
using HS_Marketing_Department_BI_Backend.Models;
using Newtonsoft.Json;
using NPOI.SS.UserModel;
using System.Data;
namespace HS_Marketing_Department_BI_Backend
{
public class ExcelImportUtil
{
/// <summary>
/// 导入文件，获取表格内容
/// </summary>
/// <param name="workbook"></param>
/// <param name="tableName"></param>
/// <param name="status"></param>
/// <returns>返回参数</returns>
public static ReturnData Import(IWorkbook workbook, string tableName, out char status)
{
ReturnData returnData = new ReturnData();
status = 'S';
string result;
string info;
DataTable dataTable = new DataTable();
//判断表名，按照表名生成不同的表结构
switch (tableName)
{
//如果是test表
case "test":
dataTable = new TestTable();
break;
}
//获取Excel第一个sheet
var sheet = workbook.GetSheetAt(0);
//判断是否获取到 sheet
if (sheet != null)
{
//从第2行开始导，第一行是标题不导入
for (int i = 1; i <= sheet.LastRowNum; i++)
{
var row = sheet.GetRow(i);
DataRow dr = dataTable.NewRow();
for (int j = 0; j < row.Count(); j++)
{
ICell cell = row.GetCell(j);
//空单元格直接跳过
if (cell == null)
{
continue;
}
//判断单元格的格式
switch (cell.CellType)
{
case CellType.String:
//输出每个单元格的数据
Console.WriteLine($"第{i}行数据：第{j}个数据值：{cell.ToString()}");
dr[j] = cell.ToString();
break;
case CellType.Numeric:
// 判断是否为日期格式
if (DateUtil.IsCellDateFormatted(cell))
{
try
{
// 安全地获取日期值
DateTime dateValue = cell.DateCellValue;
string str;
//纯时间数值范围：0 <= 数值 <= 1（无日期整数部分）
if (cell.NumericCellValue >= 0 && cell.NumericCellValue <= 1)
{
Console.WriteLine($"Time: {dateValue.ToString("HH:mm:ss")}");
str = dateValue.ToString("HH:mm:ss");
}
else
{
Console.WriteLine($"Date: {dateValue.ToString("yyyy-MM-dd HH:mm:ss")}");
str = dateValue.ToString("yyyy-MM-dd HH:mm:ss");
}
dr[j] = str;
}
catch (NullReferenceException ex)
{
// 处理 DateCellValue 为 null 的情况
status = 'E';
info = $"文件读取异常；DateCellValue is null for cell {cell.RowIndex},{cell.ColumnIndex}.Numeric value(could be date): {cell.NumericCellValue}. Exception: {ex.Message}";
returnData.code = "E";
returnData.msg = info;
return returnData;
}
}
//普通数字格式
else
{
dr[j] = cell.ToString();
}
break;
}
}
//将数据行添加到数据表
dataTable.Rows.Add(dr);
}
Console.WriteLine("读取完毕！");
}
result = JsonConvert.SerializeObject(dataTable);
returnData.code = "S";
returnData.msg = "文件上传成功，并读取成功！";
returnData.data = result;
return returnData;
}
}
}运行结果
