Aliyun-Code-Helper：OssHelper.cs

ylbtech-Aliyun-Code-Helper：OssHelper.cs

1.返回顶部

1、

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);
        }
    }
}

2、

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;
            }
        }

    }
}

2、

3. GetObject/下载文件返回顶部

1、

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;
            }
        }
    }
}

2、

4.返回顶部

 

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作者：ylbtech 出处：http://ylbtech.cnblogs.com/ 本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。