背景
图片上传功能是web开发必不可少的功能。图片上传到哪里其实都是一个非常头疼的事情，多个文件源各种地址组合，经常会出现图片地址错误问题。自从前后端分离、小程序、app成为流行后，大家一般都会将文件、图片等静态资源存储在独立的一个源，公司可以自己搭建一个文件中心，更多的是将这些静态资源存放在像阿里云oss，七牛云等专业的文件资源存储。这样会减少很多不必要的麻烦。今天我们来写一个批量上传阿里云OSS的方法，大家可以直接拿来使用。很简单的。
开发和配置
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开发环境：.NetCore3.1,Net5
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提前申请好阿里云OSS，拿到endpoint，AccessKeyID，AccessKeySecret，Bucket和Domain这些配置参数。
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项目Nuget添加包：Aliyun.OSS
封装底层代码
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using Aliyun.OSS;
using Microsoft.AspNetCore.Http;
/// <summary>
/// 沐雪多租宝SaaS多租户商城系统，阿里云上传帮助类。
/// </summary>
public class AliYunOSSHelper
{
private ILogger _logger;
/// <summary>
/// 阿里云帮助类
/// </summary>
/// <param name="logger"></param>
/// <param name="configHelper"></param>
public AliYunOSSHelper(ILogger<AliYunOSSHelper> logger, MuXueConfigHelper configHelper)
{
_logger = logger;
}
/// <summary>
/// 阿里云上传底层方法，文件为base64
/// </summary>
/// <param name="fileList"></param>
/// <returns></returns>
public async Task<Result<List<UplpadPictureResp>>> AliYunUpLoad(List<AliyunUploadModel> fileList)
{
Result<List<UplpadPictureResp>> result = new Result<List<UplpadPictureResp>>();
List<UplpadPictureResp> list = new List<UplpadPictureResp>();
try
{
//阿里云oss相关参数,请自行补齐
var endpoint = "";
var accessKeyId = "";
var accessKeySecret = "";
var bucket = "";
var imageUrl = "";
var write_client = new OssClient(endpoint, accessKeyId, accessKeySecret);
var read_client = new OssClient(endpoint, accessKeyId, accessKeySecret);
for (int i = 0; i < fileList.Count; i++)
{
using (var stream = new MemoryStream(fileList[i].bytes))
{
write_client.PutObject(bucket, fileList[i].ossFileName, stream);
}
DateTime expiration = DateTime.Now.AddYears(20);
var url = read_client.GeneratePresignedUri(bucket, fileList[i].ossFileName, expiration);
string urlstring = imageUrl + url.AbsolutePath;
list.Add(new UplpadPictureResp {
imageuri = urlstring,
imageuri_name = fileList[i].fileName,
image_bytes = fileList[i].bytes.Length / 1024,
group_id = fileList[i].g_id,
imageuri_chicun= fileList[i].imageuri_chicun
});
}
if (list != null && list.Count > 0)
{
result.code = StatusCodeEnum.Success;
result.data = list;
}
else
{
_logger.LogError("阿里云图片上传失败,请联系管理员（110-1）。");
result.code = StatusCodeEnum.Error;
result.msg = "阿里云上传失败";
}
}
catch (Exception ex)
{
result.code = StatusCodeEnum.Error;
result.msg = ex.Message;
_logger.LogError(ex, "阿里云图片上传失败,ex=" + ex.Message);
throw;
}
return result;
}
/// <summary>
/// 阿里云上传底层方法，文件为IFormFile
/// </summary>
/// <param name="shop_code"></param>
/// <param name="files"></param>
/// <returns></returns>
public async Task<List<string>> AliYunUpLoad( List<IFormFile> files)
{
List<string> ossfilesNameList = new List<string>();
try
{
//阿里云oss相关参数,请自行补齐
var endpoint = "";
var accessKeyId = "";
var accessKeySecret = "";
var bucket = "";
var imageUrl = "";
var write_client = new OssClient(endpoint, accessKeyId, accessKeySecret);
var read_client = new OssClient(endpoint, accessKeyId, accessKeySecret);
for (int i = 0; i < files.Count; i++)
{
var file = files[i];
var fname = DateTime.Now.ToString("yyyyMMddHHmmssffffff") + i + Path.GetExtension(file.FileName);
using (var stream = file.OpenReadStream())
{
write_client.PutObject(bucket, fname, stream);
}
DateTime expiration = DateTime.Now.AddYears(20);
var url = read_client.GeneratePresignedUri(bucket, fname, expiration);
string urlstring = imageUrl + url.AbsolutePath;
ossfilesNameList.Add(urlstring);
}
}
catch (Exception ex)
{
_logger.LogError(ex, "阿里云图片上传失败,ex=" + ex.Message);
throw;
}
return ossfilesNameList;
}
}
我封装了2个方法，一个的入参的文件为base64，一个为IFormFile，这2种基本上足够用了。文件的有限期设置为20年。
依赖注入
services.AddScoped<AliYunOSSHelper>();
使用
在控制器或者WebApi里都可以直接调用了。
构造函数获取服务。
private readonly ILogger<TenantCommonController> _logger;
private AliYunOSSHelper _oSSHelper;
public TenantCommonController(ILogger<TenantCommonController> logger, AliYunOSSHelper oSSHelper )
{
_logger = logger;
_oSSHelper = oSSHelper;
}
Action方法
/// <summary>
/// 通用的图片上传,支持多图片上传
/// </summary>
/// <param name="files"></param>
/// <returns></returns>
[HttpPost]
public async Task<ActionResult> UploadPic(List<IFormFile> files)
{
//15M
var maxRequestLength = 1024 * 1024 * 15;
List<string> filesName = new List<string>();
if (files.Count == 0) return Content("NoFile", "text/html");
else
{
List<AliyunUploadModel> fileList = new List<AliyunUploadModel>();
for (var i = 0; i < files.Count; i++)
{
var file = files[i];
if (null == file || file.Length <= 0) return Content("格式不正确！", "text/html");
if (file.Length > maxRequestLength)
{
return Content("文件大小超出限制！", "text/html");
}
var fname = DateTime.Now.ToString("yyyyMMddHHmmssffffff") + i + Path.GetExtension(file.FileName);
if (!FileExtensionFun.CheckImageFileType(fname))
{
return Content("上传的图片格式不正确", "text/html");
}
}
filesName = await _oSSHelper.AliYunUpLoad(files);
}
return Content(string.Join(",", filesName), "text/html");
}