C#中怎么導(dǎo)出pdf，很多新手對(duì)此不是很清楚，為了幫助大家解決這個(gè)難題，下面小編將為大家詳細(xì)講解，有這方面需求的人可以來(lái)學(xué)習(xí)下，希望你能有所收獲。
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一.接口部分的代碼
[HttpGet] public HttpResponseMessage ExportPdf(string id) { string pdfName = ""; //id 查詢(xún)條件，根據(jù)實(shí)際情況修改即可 //pdfName 例如download.pdf byte[] pdfData= _policyGapManagerService.ExportPdf(id, out pdfName);//獲得pdf字節(jié) 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.返回pdfbyte數(shù)組
1.下載http模式的pdf文件（以ASP.NET為例，將PDF存在項(xiàng)目的目錄下，可以通過(guò)http直接打開(kāi)項(xiàng)目下的pdf文件）
#region 調(diào)用本地文件使用返回pdfbyte數(shù)組 /// /// 調(diào)用本地文件使用返回pdfbyte數(shù)組 /// /// ‘D:\in2434341555551.pdf' /// 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 調(diào)用本地文件使用返回pdfbyte數(shù)組 #region 從網(wǎng)站上下載pdf，轉(zhuǎn)化為字節(jié)流 /// /// 從網(wǎng)站上下載pdf，轉(zhuǎn)化為字節(jié)流 /// /// 文件地址：'https://******/group2/M00/00/04/wKj-mlpcoZ2IUbK5AACrpaV6k98AAAB6gAAAAAAAKu9562.pdf' /// 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(); //讀取到內(nèi)存 MemoryStream stmMemory = new MemoryStream(); byte[] buffer1 = new byte[length]; int i; //將字節(jié)逐個(gè)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(wǎng)站上下載pdf，轉(zhuǎn)化為字節(jié)流 #region 從網(wǎng)站上下載文件，保存到其他路徑 /// /// 從網(wǎng)站上下載文件，保存到其他路徑 /// /// 文件地址 /// 保存文件路徑：D:\12221.pdf /// 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(gè)ＷＥＢ請(qǐng)求，返回HttpWebRequest對(duì)象 HttpWebRequest hwr = (HttpWebRequest)WebRequest.Create(downUri); //流對(duì)象使用完后自動(dòng)關(guān)閉 using (Stream stream = hwr.GetResponse().GetResponseStream()) { //文件流，流信息讀到文件流中，讀完關(guān)閉 using (FileStream fs = File.Create(f)) { //建立字節(jié)組，并設(shè)置它的大小是多少字節(jié) byte[] bytes = new byte[102400]; int n = 1; while (n > 0) { //一次從流中讀多少字節(jié)，并把值賦給Ｎ，當(dāng)讀完后，Ｎ為０,并退出循環(huán) n = stream.Read(bytes, 0, 10240); fs.Write(bytes, 0, n); //將指定字節(jié)的流信息寫(xiě)入文件流中 } } } //return flag; //return _outPath + saveLoadFile; return f; } #endregion 從網(wǎng)站上下載文件，保存到其他路徑
2.ftp模式的pdf文件
/// /// 下載FTP文件。 /// /// 相對(duì)路徑 /// 文件名稱(chēng) /// 下載結(jié)果，本地文件路徑 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 "文件不存在!"; } 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; } } /// /// 判斷文件是否存在 /// /// /// /// 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; } } /// /// 獲取目錄下所有文件 /// /// 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 fileList = new List(); 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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