一.介面部分的代碼
[HttpGet] public HttpResponseMessage ExportPdf(string id) { string pdfName = "";
//id 查詢條件，根據實際情況修改即可
//pdfName 例如download.pdf byte[] pdfData= https://www.cnblogs.com/hahahayang/p/_policyGapManagerService.ExportPdf(id, out pdfName);//獲得pdf位元組 var result = new HttpResponseMessage(HttpStatusCode.OK) { Content = new ByteArrayContent(pdfData) }; result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = pdfName }; result.Content.Headers.ContentType =new MediaTypeHeaderValue("application/pdf"); return result; }
二.回傳pdfbyte陣列
1.下載http模式的pdf檔案（以ASP.NET為例，將PDF存在專案的目錄下，可以通過http直接打開專案下的pdf檔案）
#region 呼叫本地檔案使用回傳pdfbyte陣列 /// <summary> /// 呼叫本地檔案使用回傳pdfbyte陣列 /// </summary> /// <param name="srcPdfFile">‘D:\in2434341555551.pdf’</param> /// <returns></returns> public static byte[] GetSignaturePDFByte(string srcPdfFile) { using (FileStream fsRead = new FileStream(srcPdfFile, FileMode.Open, FileAccess.Read, FileShare.Read)) { int fsLen = (int)fsRead.Length; byte[] hebyte = new byte[fsLen]; fsRead.Read(hebyte, 0, hebyte.Length); return hebyte; } } #endregion 呼叫本地檔案使用回傳pdfbyte陣列 #region 從網站上下載pdf，轉化為位元組流 /// <summary> /// 從網站上下載pdf，轉化為位元組流 /// </summary> /// <param name="srcPdfFile">檔案地址：'https://******/group2/M00/00/04/wKj-mlpcoZ2IUbK5AACrpaV6k98AAAB6gAAAAAAAKu9562.pdf'</param> /// <returns></returns> public static Byte[] GetByteByRemoteURL(string srcPdfFile) { byte[] arraryByte; HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(srcPdfFile); req.Method = "GET"; using (WebResponse wr = req.GetResponse()) { StreamReader responseStream = new StreamReader(wr.GetResponseStream(), Encoding.UTF8); int length = (int)wr.ContentLength; byte[] bs = new byte[length]; HttpWebResponse response = wr as HttpWebResponse; Stream stream = response.GetResponseStream(); //讀取到記憶體 MemoryStream stmMemory = new MemoryStream(); byte[] buffer1 = new byte[length]; int i; //將位元組逐個放入到Byte 中 while ((i = stream.Read(buffer1, 0, buffer1.Length)) > 0) { stmMemory.Write(buffer1, 0, i); } arraryByte = stmMemory.ToArray(); stmMemory.Close(); } return arraryByte; } #endregion 從網站上下載pdf，轉化為位元組流 #region 從網站上下載檔案，保存到其他路徑 /// <summary> /// 從網站上下載檔案，保存到其他路徑 /// </summary> /// <param name="pdfFile">檔案地址</param> /// <param name="saveLoadFile">保存檔案路徑：D:\12221.pdf</param> /// <returns></returns> public string SaveRemoteFile( string saveLoadFile , string pdfFile) { //bool flag = false; var f = saveLoadFile + Guid.NewGuid().ToString("D") + ".pdf"; Uri downUri = new Uri(pdfFile); //建立一個ＷＥＢ請求，回傳HttpWebRequest物件 HttpWebRequest hwr = (HttpWebRequest)WebRequest.Create(downUri); //流物件使用完后自動關閉 using (Stream stream = hwr.GetResponse().GetResponseStream()) { //檔案流，流資訊讀到檔案流中，讀完關閉 using (FileStream fs = File.Create(f)) { //建立位元組組，并設定它的大小是多少位元組 byte[] bytes = new byte[102400]; int n = 1; while (n > 0) { //一次從流中讀多少位元組，并把值賦給Ｎ，當讀完后，Ｎ為０,并退出回圈 n = stream.Read(bytes, 0, 10240); fs.Write(bytes, 0, n); //將指定位元組的流資訊寫入檔案流中 } } } //return flag; //return _outPath + saveLoadFile; return f; } #endregion 從網站上下載檔案，保存到其他路徑
2.ftp模式的pdf檔案
/// <summary> /// 下載FTP檔案， /// </summary> /// <param name="offsetPath">相對路徑</param> /// <param name="fileName">檔案名稱</param> /// <returns>下載結果，本地檔案路徑</returns> public string DownLoad(string offsetPath,string fileName) { try { FtpWebRequest ftpWeb = (FtpWebRequest)WebRequest.Create(_ftpRootPath + offsetPath + fileName); ftpWeb.Method = WebRequestMethods.Ftp.DownloadFile; ftpWeb.UseBinary = true; var resp = ftpWeb.GetResponse(); using (FileStream fs = new FileStream(_outPath + fileName, FileMode.Create)) { using (var s = resp.GetResponseStream()) { if (s == null) { return "檔案不存在!"; } int readCout = 0; byte[] bytes = new byte[1024]; readCout = s.Read(bytes, 0, 1024); while (readCout > 0) { fs.Write(bytes, 0, readCout); readCout = s.Read(bytes, 0, 1024); } } } resp.Close(); return _outPath + fileName; } catch (Exception e) { return e.Message; } } /// <summary> /// 判斷檔案是否存在 /// </summary> /// <param name="offsetPath"></param> /// <param name="fileName"></param> /// <returns></returns> public bool FileExists(string offsetPath, string fileName) { try { FtpWebRequest ftpWeb = (FtpWebRequest)WebRequest.Create(_ftpRootPath + offsetPath + fileName); ftpWeb.Method = WebRequestMethods.Ftp.DownloadFile; ftpWeb.UseBinary = true; var resp = (FtpWebResponse)ftpWeb.GetResponse(); resp.Close(); return true; } catch (Exception) { return false; } } /// <summary> /// 獲取目錄下所有檔案 /// </summary> /// <returns></returns> public string[] Files(string offsetPath) { try { FtpWebRequest ftpWeb = (FtpWebRequest)WebRequest.Create(_ftpRootPath + offsetPath); ftpWeb.Method = WebRequestMethods.Ftp.ListDirectory; Stream stream = ftpWeb.GetResponse().GetResponseStream(); if (stream == null) { return null; } List<string> fileList = new List<string>(); using (StreamReader sr = new StreamReader(stream)) { StringBuilder sb = new StringBuilder(); do { sb.Append(sr.ReadLine()); if (sb.Length > 0) { fileList.Add(sb.ToString()); sb.Clear(); } else { break; } } while (true); } return fileList.ToArray(); } catch (Exception) { return null; } }
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標籤：C#