net6WebApi上传下载文件

net6WebApi上传下载文件

本文介绍记录在web api中实现 上传和下载。

编程环境：VS2022

框架：NET6.0

1、创建6 web api 项目

IFileService.cs

namespace WebApplication1.service
{public interface IFileService{void UploadFile(List<IFormFile> files, string subDirectory);(string fileType, byte[] archiveData, string archiveName) DownloadFiles(string subDirectory);string SizeConverter(long bytes);}
}

FileService.cs

using System.IO.Compression;namespace WebApplication1.service;public class FileService : IFileService
{#region Propertyprivate readonly IWebHostEnvironment _webHostEnvironment;#endregion#region Constructorpublic FileService(IWebHostEnvironment webHostEnvironment){_webHostEnvironment = webHostEnvironment;}#endregion#region Upload Filepublic void UploadFile(List<IFormFile> files, string subDirectory){subDirectory = subDirectory ?? string.Empty;var target = Path.Combine(_webHostEnvironment.ContentRootPath, subDirectory);Directory.CreateDirectory(target);files.ForEach(async file =>{if (file.Length <= 0) return;var filePath = Path.Combine(target, file.FileName);await using var stream = new FileStream(filePath, FileMode.Create);await file.CopyToAsync(stream);});}#endregion#region Download Filepublic (string fileType, byte[] archiveData, string archiveName) DownloadFiles(string subDirectory){var zipName = $"archive-{DateTime.Now:yyyy_MM_dd-HH_mm_ss}.zip";var files = Directory.GetFiles(Path.Combine(_webHostEnvironment.ContentRootPath, subDirectory)).ToList();using var memoryStream = new MemoryStream();using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true)){files.ForEach(file =>{var theFile = archive.CreateEntry(Path.GetFileName(file));using var binaryWriter = new BinaryWriter(theFile.Open());binaryWriter.Write(File.ReadAllBytes(file));});}return ("application/zip", memoryStream.ToArray(), zipName);}#endregion#region Size Converterpublic string SizeConverter(long bytes){var fileSize = new decimal(bytes);var kilobyte = new decimal(1024);var megabyte = new decimal(1024 * 1024);var gigabyte = new decimal(1024 * 1024 * 1024);return fileSize switch{_ when fileSize < kilobyte => "Less then 1KB",_ when fileSize < megabyte =>$"{Math.Round(fileSize / kilobyte, 0, MidpointRounding.AwayFromZero):##,###.##}KB",_ when fileSize < gigabyte =>$"{Math.Round(fileSize / megabyte, 2, MidpointRounding.AwayFromZero):##,###.##}MB",_ when fileSize >= gigabyte =>$"{Math.Round(fileSize / gigabyte, 2, MidpointRounding.AwayFromZero):##,###.##}GB",_ => "n/a"};}#endregion
}

创建API控制器：FileController

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.ComponentModel.DataAnnotations;namespace WebApplication1.service
{[Route("api/[controller]")][ApiController]public class FileController : ControllerBase{private readonly IFileService _fileService;public FileController(IFileService fileService){_fileService = fileService;}[HttpPost(nameof(Upload))]public IActionResult Upload([Required] List<IFormFile> formFiles, [Required] string subDirectory){try{_fileService.UploadFile(formFiles, subDirectory);return Ok(new { formFiles.Count, Size = _fileService.SizeConverter(formFiles.Sum(f => f.Length)) });}catch (Exception ex){return BadRequest(ex.Message);}}[HttpGet(nameof(Download))]public IActionResult Download([Required] string subDirectory){try{var (fileType, archiveData, archiveName) = _fileService.DownloadFiles(subDirectory);return File(archiveData, fileType, archiveName);}catch (Exception ex){return BadRequest(ex.Message);}}}
}

在Program.cs中注入服务：

using WebApplication1.service;var builder = WebApplication.CreateBuilder(args);// Add services to the container.
// Learn more about configuring Swagger/OpenAPI at 
builder.Services.AddControllers();
builder.Services.AddSwaggerGen();// 主要是添加下面这句代码，注入文件服务
builder.Services.AddTransient<IFileService, FileService>();var app = builder.Build();// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{app.UseSwagger();app.UseSwaggerUI();
}app.MapControllers();app.Run();

下载码：CF2AF7C49B

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