.Net和.Net Core下使用FastDFS文件上传下载

淩亂°似流年 2021-06-26 16:06 486阅读 0赞

引入`FastDFS.Client.bll`

下载地址：[https://pan.baidu.com/s/1-6HcXf8xP3XR883IGflFiw][https_pan.baidu.com_s_1-6HcXf8xP3XR883IGflFiw]

添加 `FastDFSHelper`类，代码如下：

/// <summary>
        /// 负责人: QFN
        /// 时 间: 2018-10-15 15:28:37
        /// 功 能: FastDFS 文件上传下载
        /// 描 叙: 
        /// </summary>
     
        public class FastDFSHelper
        { 
            private List<IPEndPoint> trackerIPs = new List<IPEndPoint>();
            private IPEndPoint endPoint;
            private StorageNode storageNode;
            private string groupName = ConfigurationManager.AppSettings["fastdfs_groupname"];
            /// <summary>
            /// 链接 FASTDFS
            /// </summary>
            public FastDFSHelper()
            { 
                string[] trackers = ConfigurationManager.AppSettings["fastdfs_trackers"].Split(new char[','], StringSplitOptions.RemoveEmptyEntries);
                string[] storages = ConfigurationManager.AppSettings["fastdfs_storages"].Split(new char[','], StringSplitOptions.RemoveEmptyEntries);
                int port = int.Parse(ConfigurationManager.AppSettings["fastdfs_port"]);
     
                foreach (var onetracker in trackers)
                { 
                    trackerIPs.Add(new IPEndPoint(IPAddress.Parse(onetracker), port));
                }
                ConnectionManager.Initialize(trackerIPs);
                storageNode = FastDFSClient.GetStorageNode(groupName);
            }
            /// <summary>
            /// 上传文件
            /// </summary>
            /// <param name="fileStream">文件流</param>
            /// <param name="prefixName">从文件前缀名称</param>
            /// <param name="slaveFileName">返回从文件路径</param>
            /// <returns>返回主文件路径</returns>
            public string UploadFile(Stream fileStream, string prefixName, string fileExt, out string slaveFileName)
            { 
     
                byte[] content = new byte[fileStream.Length];
     
                using (BinaryReader reader = new BinaryReader(fileStream))
                { 
                    content = reader.ReadBytes((int)fileStream.Length);
                }
     
                //主文件
                string fileName = FastDFSClient.UploadFile(storageNode, content, fileExt);
                var info = FastDFSClient.GetFileInfo(storageNode, fileName);
                //从文件
                slaveFileName = FastDFSClient.UploadSlaveFile(groupName, content, fileName, prefixName, fileExt);
                var slaveInfo = FastDFSClient.GetFileInfo(storageNode, slaveFileName);
                return fileName;
            }
            /// <summary>
            /// 下载文件
            /// </summary>
            /// <param name="fileName">文件路径</param>
            /// <param name=""></param>
            /// <returns>文件流</returns>
            public FileStream DownloadFile(string fileName)
            { 
     
                FDFSFileInfo fileInfo = FastDFSClient.GetFileInfo(storageNode, fileName);
     
                FileStream fileStream = new FileStream(Path.GetTempFileName(), FileMode.Create);
                if (fileInfo.FileSize >= 1024)//如果文件大小大于1KB 分次写入
                { 
                    long offset = 0;
                    long len = 1024;
                    while (len > 0)
                    { 
                        byte[] buffer = new byte[len];
                        buffer = FastDFSClient.DownloadFile(storageNode, fileName, offset, len);
                        fileStream.Write(buffer, 0, int.Parse(len.ToString()));
                        fileStream.Flush();
                        offset = offset + len;
                        len = (fileInfo.FileSize - offset) >= 1024 ? 1024 : (fileInfo.FileSize - offset);
                    }
                    return fileStream;
                }
                else//如果文件大小小小于1KB 直接写入文件
                { 
                    byte[] buffer = new byte[fileInfo.FileSize];
                    buffer = FastDFSClient.DownloadFile(storageNode, fileName);
                    //FileStream fileStream = new FileStream(targetPath, FileMode.OpenOrCreate, FileAccess.Write);
                    fileStream.Write(buffer, 0, buffer.Length);
                    fileStream.Flush();
                    fileStream.Close();
                    return fileStream;
                }
            }
     
     
            /// <summary>
            /// 下载文件
            /// </summary>
            /// <param name="fileName">文件路径</param>
            /// <param name=""></param>
            /// <returns>文件流</returns>
            public byte[] DownloadFileByte(string fileName)
            { 
                FDFSFileInfo fileInfo = FastDFSClient.GetFileInfo(storageNode, fileName);
                byte[] buffer = new byte[fileInfo.FileSize];
                buffer = FastDFSClient.DownloadFile(storageNode, fileName);
     
                FileStream fs = new FileStream("D://down123.png", FileMode.Create, FileAccess.Write);
                fs.Write(buffer, 0, buffer.Length);
                fs.Flush();
                fs.Close();
     
                return buffer;
            }
     
            /// <summary>
            /// 下载文件 流模式
            /// </summary>
            /// <param name="fileName">文件路径</param>
            /// <param name=""></param>
            /// <returns>文件流</returns>
            public Stream DownloadFileStream(string fileName)
            { 
                FDFSFileInfo fileInfo = FastDFSClient.GetFileInfo(storageNode, fileName);
     
                Stream stream = new MemoryStream();
     
     
                if (fileInfo.FileSize >= 1024)//如果文件大小大于1KB 分次写入
                { 
                    long offset = 0;
                    long len = 1024;
                    while (len > 0)
                    { 
                        byte[] buffer = new byte[len];
                        buffer = FastDFSClient.DownloadFile(storageNode, fileName, offset, len);
                        stream.Write(buffer, 0, int.Parse(len.ToString()));
                        stream.Flush();
                        offset = offset + len;
                        len = (fileInfo.FileSize - offset) >= 1024 ? 1024 : (fileInfo.FileSize - offset);
                    }
     
                }
                else//如果文件大小小小于1KB 直接写入文件
                { 
                    byte[] buffer = new byte[fileInfo.FileSize];
                    buffer = FastDFSClient.DownloadFile(storageNode, fileName);
                    //FileStream fileStream = new FileStream(targetPath, FileMode.OpenOrCreate, FileAccess.Write);
                    stream.Write(buffer, 0, buffer.Length);
                    stream.Flush();
                }
                stream.Seek(0, SeekOrigin.Begin);
                return stream;
            }
     
            public void UploadFile(Stream fileStream, string fileName)
            { 
                try
                { 
                    byte[] buffer = new byte[fileStream.Length];
     
                    FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);
     
                    int count = 0;
                    while ((count = fileStream.Read(buffer, 0, buffer.Length)) > 0)
                    { 
                        fs.Write(buffer, 0, count);
                    }
                    //清空缓冲区
                    fs.Flush();
                    //关闭流
                    fs.Close();
                }
                catch (Exception e)
                { 
                }
            }
            /// <summary>
            /// 根据文件名称获取文件浏览路径
            /// </summary>
            /// <param name="fileName"></param>
            /// <returns></returns>
            public string GetFilePath(string fileName)
            { 
                string trackers = ConfigurationManager.AppSettings["fastdfs_storages"];
                string groupname = ConfigurationManager.AppSettings["fastdfs_groupname"];
                return trackers + "/" + groupname + "/" + fileName;
            }
        }

其中 `ConfigurationManager.AppSettings` 为获取配置文件中的配置信息，这里有多种下载方式。

配置文件如下：

<add key="fastdfs_trackers" value="192.168.1.56" />
        <add key="fastdfs_storages" value="192.168.1.56" />
        <add key="fastdfs_port" value="22122" />
        <add key="fastdfs_groupname" value="group1" />
     
        <add key="fastdfs_maxsize" value="10000000" />
        <add key="fastdfs_type" value="gif,jpg,jpeg,png,bmp,zip,rar,layout" />
        <add key="fastdfs_type_file" value="txt,xlsx,zip,rar" />

[https_pan.baidu.com_s_1-6HcXf8xP3XR883IGflFiw]: https://pan.baidu.com/s/1-6HcXf8xP3XR883IGflFiw