20200728-直接提取压缩包里的文件
一 使用背景：
通过Http 请求下载一个压缩的文件到服务器内存中（重点：不用保存到本地），然后通过代码直接提取压缩包的文件
二 实现思路：(注：需要提前安装 ICSharpCode.SharpZipLib.dll)
1 通过Http请求下载压缩文件到服务器的内存中
2 读取内存中压缩的包的流(注意先将:Stream 转换成MemoryStream)
3 通过ICSharpCode.SharpZipLib.Zip.dll的ZipFile方法将压缩包的MemoryStream 注入
4 通过文件索引提取压缩包里的文件流
5 保存上传文件到指定位置
三 参考代码:
1 public string HttpDownloadFile(int tenantId, RequestHeaadModel heaadModel) 2 { 3 var dfsResultPath = string.Empty; 4 var listDfsPath = new List<string>(); 5 try 6 { 7 #region Http请求参数设置 8 ServicePointManager.Expect100Continue = false; 9 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3;10 ServicePointManager.ServerCertificateValidationCallback += (object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) => true;11 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(heaadModel.ResquestParamUrl);12 request.Headers.Add("x-qys-accesstoken", heaadModel.Accesstoken);13 request.Headers.Add("x-qys-timestamp", "0");14 request.Headers.Add("x-qys-signature", heaadModel.Searect);15 request.ContentType = heaadModel.ContentType;16 request.Method = "GET";17 request.Timeout = 100000;18 request.Accept = "application/octet-stream";19 #endregion20 21 #region 对响应的压缩包解析22 using (WebResponse webRes = request.GetResponse())23 {24 #region 1 获取响应的压缩包文件流25 var length = (long)webRes.ContentLength;26 var response = webRes as HttpWebResponse;27 var stream = response.GetResponseStream();28 #endregion29 30 #region 2 将压缩包文件流程读取到内存中31 var stmMemory = new MemoryStream();32 if (length == -1)33 {34 length = 1024;35 }36 var buffer = new byte[length];37 int i;38 while ((i = stream.Read(buffer, 0, buffer.Length)) > 0)39 {40 stmMemory.Write(buffer, 0, i);41 }42 #endregion43 44 #region 3 循环读取压缩包的文件45 var zipFile_ = new ICSharpCode.SharpZipLib.Zip.ZipFile(stmMemory);46 int count = int.Parse(zipFile_.Count.ToString());//获取文件个数47 for (int j = 0; j < count; j++)48 {49 var tempSteam = zipFile_.GetInputStream(long.Parse($"{i}"));//压缩包里的文件索引50 var stmMemory2 = new MemoryStream();51 var buffer2 = new byte[zipFile_[i].Size];52 int m;53 //将单个文件的文件流读取到内存中54 while ((m = tempSteam.Read(buffer2, 0, buffer2.Length)) > 0)55 {56 stmMemory2.Write(buffer2, 0, m);57 }58 stmMemory2.Seek(0, SeekOrigin.Begin);59 var dfsItem = new DfsItem("TenantBaseFile", zipFile_[i].Name,60 stmMemory2, tenantId);61 var dfsPath = Dfs.Store(dfsItem);62 63 Logger.Debug($"下载背调文件地址：{dfsPath.ToString()}");64 listDfsPath.Add(dfsPath.ToString());65 stmMemory2.Close();66 stmMemory2.Flush();67 }68 #endregion69 stmMemory.Close();70 stmMemory.Flush();71 }72 #endregion73 }74 catch (Exception ex)75 {76 Logger.Debug($"下载报告异常：异常信息：{ex.Message}，堆栈信息：{ex.StackTrace}");77 }78 79 return string.Join(",", listDfsPath);80 }
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