本文為大家分享了HttpWebRequest實現(xiàn)下載圖片至本地的具體代碼，供大家參考，具體內(nèi)容如下
HttpWebRequest發(fā)送web請求，獲取流文件，保存至本地
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | using System;using System.IO;using System.Net;using System.Text;using System.Web.Mvc; namespace Web.Controllers{ public class HomeController : Controller { string url = "http://www.***.com/Image.aspx?ucode=ucode"; public Stream GetFileToStream(string filePath) { FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read); byte[] bytes = new byte[fileStream.Length]; fileStream.Read(bytes, 0, bytes.Length); fileStream.Close(); Stream streamFile = new MemoryStream(bytes); return streamFile; } public void Method1() { string fileName = @"\upload\" + GenerateTimeStamp() + ".jpg"; string webPath = Server.MapPath(fileName); string pathName = @"d:\" + GenerateTimeStamp() + ".jpg"; HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url); req.ServicePoint.Expect100Continue = false; req.Method = "GET"; req.KeepAlive = true; req.ContentType = "image/png"; HttpWebResponse rsp = (HttpWebResponse)req.GetResponse(); System.IO.Stream stream = null; try { //以字符流的方式讀取HTTP響應 stream = rsp.GetResponseStream(); System.Drawing.Image.FromStream(stream).Save(pathName); } finally { // 釋放資源 if (stream != null) stream.Close(); if (rsp != null) rsp.Close(); } } protected void Method2() { string fileName = @"\upload\" + GenerateTimeStamp() + ".jpg"; string webPath = Server.MapPath(fileName); string pathName = @"d:\" + GenerateTimeStamp() + ".jpg"; HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url); myRequest.Method = "GET"; HttpWebResponse myResponse = null; try { myResponse = (HttpWebResponse)myRequest.GetResponse(); StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8); Stream stream = myResponse.GetResponseStream(); #region 保存下載圖片 MemoryStream ms = null; Byte[] buffer = new Byte[myResponse.ContentLength]; int offset = 0, actuallyRead = 0; do { actuallyRead = stream.Read(buffer, offset, buffer.Length - offset); offset += actuallyRead; } while (actuallyRead > 0); ms = new MemoryStream(buffer); byte[] buffurPic = ms.ToArray(); System.IO.File.WriteAllBytes(pathName, buffurPic); #endregion } //異常請求 catch (WebException ex) { } } protected void Method3() { string fileName = @"\upload\" + GenerateTimeStamp() + ".jpg"; string webPath = Server.MapPath(fileName); string pathName = @"d:\" + GenerateTimeStamp() + ".jpg"; HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url); myRequest.Method = "GET"; HttpWebResponse myResponse = null; try { myResponse = (HttpWebResponse)myRequest.GetResponse(); StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8); Stream stream = myResponse.GetResponseStream(); #region 保存下載圖片 FileStream fileStream = new FileStream(pathName, FileMode.Create, FileAccess.Write); byte[] bytes = new byte[1024]; int readSize = 0; while ((readSize = stream.Read(bytes, 0, 1024)) > 0) { fileStream.Write(bytes, 0, readSize); fileStream.Flush(); } #endregion myResponse.Close(); stream.Close(); fileStream.Close(); } //異常請求 catch (WebException ex) { } finally { } } public string GenerateTimeStamp() { TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0); return Convert.ToInt64(ts.TotalMilliseconds).ToString(); } }} |
以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
