| ylbtech-Aliyun-Code-Helper：OssHelper.cs |
| 1.返回顶部 |
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using Aliyun.OSS; using System; using System.Configuration; using System.IO; namespace Sp.Common { /// <summary> /// 阿里云OSS帮助类 /// </summary> public static class OssHelper { public static readonly string AttachmentFolder = "Attachment"; //附件文件夹名称 #region OSS 参数 public static readonly string Endpoint = ConfigurationManager.AppSettings["OSS_Endpoint"]; public static readonly string AccessKeyId = ConfigurationManager.AppSettings["OSS_AccessKeyId"]; public static readonly string BucketName = ConfigurationManager.AppSettings["OSS_BucketName"]; public static readonly string AccessKeySecret = ConfigurationManager.AppSettings["OSS_AccessKeySecret"]; #endregion static OssClient client = new OssClient(Endpoint, AccessKeyId, AccessKeySecret); /// <summary> /// 上传文件 /// </summary> /// <param name="key"></param> /// <param name="filename"></param> public static void PutObject(string key, string filename) { client.PutObject(BucketName, key, filename); } /// <summary> /// 上传文件 /// </summary> /// <param name="key"></param> /// <param name="filename"></param> public static void PutObject(string key, Stream stream) { client.PutObject(BucketName, key, stream); } /// <summary> /// 删除文件 /// </summary> /// <param name="key"></param> public static void DeleteObject(string key) { if (client.DoesObjectExist(BucketName, key)) client.DeleteObject(BucketName, key); } /// <summary> /// 下载文件 /// 根据key获取文件，并保存本地；临时文件，文件下载后即删除 /// </summary> /// <param name="key"></param> /// <param name="filename"></param> public static void GetObject(string key, string filename) { var result = client.GetObject(BucketName, key); using (var requestStream = result.Content) { using (var fs = File.Open(filename, FileMode.OpenOrCreate)) { int length = 4 * 1024; var buf = new byte[length]; do { length = requestStream.Read(buf, 0, length); fs.Write(buf, 0, length); } while (length != 0); } } } /// <summary> /// 判断文件是否存在 /// </summary> /// <param name="key"></param> /// <returns></returns> public static bool DoesObjectExist(string key) { return client.DoesObjectExist(BucketName, key); } /// <summary> /// 获取key /// </summary> /// <param name="extension">文件扩展名</param> /// <returns></returns> public static string GetKey(string extension) { return string.Format("{0}/{1}/{2}{3}", AttachmentFolder, DateTime.Now.ToString("yyyyMMdd"), Guid.NewGuid().ToString(), extension); } } }
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| 2. PutObject/上传文件返回顶部 |
1、一般处理程序
using System; using System.IO; using System.Web; using Sp.Common; using System.Text; namespace Sp.Web.Common { /// <summary> /// 阿里云OSS文件上传 的摘要说明 /// </summary> public class FORMFileUploadAnnex : IHttpHandler { public void ProcessRequest(HttpContext context) { var postedFile = context.Request.Files["fileAttachment"]; if (postedFile == null || postedFile.ContentLength <= 0) throw new Exception("附件上传错误!"); if (postedFile.ContentLength > 3 * 1024 * 1024) { throw new Exception("附件大小超出限制!"); } #region 把上传文件转换成stream byte[] bytes = null; bytes = new byte[postedFile.ContentLength]; postedFile.InputStream.Read(bytes, 0, postedFile.ContentLength - 1); Stream stream = new MemoryStream(bytes); #endregion string key = OssHelper.GetKey(fi.Extension); OssHelper.PutObject(key, stream); docModel.DOC_PATH = key; //执行附件表数据保存操作 var fileManager = new PUB_DOCUMENTDAO(); fileManager.Save(docModel); context.Response.Clear(); context.Response.End(); context.Response.Close(); } public bool IsReusable { get { return false; } } } }
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| 3. GetObject/下载文件返回顶部 |
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using System; using Sp.Common; using System.IO; using System.Text; using System.Web; namespace Sp.Web.Common { /// <summary> /// 阿里云OSS文件下载 的摘要说明 /// </summary> public class DownloadFile : IHttpHandler { public void ProcessRequest(HttpContext context) { string _filename = HttpUtility.UrlDecode(context.Request.QueryString["filename"], Encoding.UTF8); string key = HttpUtility.UrlDecode(context.Request.QueryString["key"], Encoding.UTF8); if (OssHelper.DoesObjectExist(key)) { #region 创建临时文件夹 var fileSavePath = @"C: mb_temp"; if (!Directory.Exists(fileSavePath))//文件夹不存在则创建 { Directory.CreateDirectory(fileSavePath); } var fileFullPath = fileSavePath + @"" + _filename;//文件保存绝对路径 #endregion FileInfo file = new FileInfo(fileFullPath); if (!Directory.Exists(file.DirectoryName)) Directory.CreateDirectory(file.DirectoryName); string filename = fileFullPath; OssHelper.GetObject(key, filename); //以字符流的形式下载文件 FileStream fs = new FileStream(filename, FileMode.Open); byte[] bytes = new byte[(int)fs.Length]; fs.Read(bytes, 0, bytes.Length); fs.Close(); if (File.Exists(filename)) File.Delete(filename); //删除临时文件 context.Response.ContentType = "application/octet-stream"; //通知浏览器下载文件而不是打开 context.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(_filename, System.Text.Encoding.UTF8)); context.Response.BinaryWrite(bytes); context.Response.Flush(); context.Response.End(); }else { context.Response.ContentType = "text/plain"; context.Response.Write("下载文件不存在"); } } public bool IsReusable { get { return false; } } } }
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| 4.返回顶部 |
| 5.返回顶部 |
| 6.返回顶部 |
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