下载远程(第三方服务器)文件、图片,保存到本地(服务器)的方法、保存抓取远程文件、图片 将图片的二进制字节字符串在HTML页面以图片形式输出 asp.net 文件 操作方法
下载远程(第三方服务器)文件、图片,保存到本地(服务器)的方法、保存抓取远程文件、图片
将一台服务器的文件、图片,保存(下载)到另外一台服务器进行保存的方法:
1 #region 图片下载 2 3 #region 图片下载【使用流、WebRequest进行保存】 4 /// <summary> 5 /// 图片下载【使用流、WebRequest进行保存】 6 /// </summary> 7 /// <param name="fileUrl">图片URL地址(例如:http://img.baidu.com/video/img/video_logo_new.gif) </param> 8 /// <param name="path">存储到本地(服务器)路径(例如:Upload/Image)</param> 9 /// <param name="fileName">文件名(包含后缀名)</param> 10 /// <param name="fileFormat">图片格式</param> 11 public static void WebRequestDownloadFileImage(string fileUrl, string path, string fileName, System.Drawing.Imaging.ImageFormat fileFormat) 12 { 13 try 14 { 15 path = HttpContext.Current.Server.MapPath(string.Format("~/{0}/", path)); 16 if (!Directory.Exists(path)) //判断目录是否存在 17 { 18 Directory.CreateDirectory(path);//创建该文件 19 } 20 WebRequest wreq = WebRequest.Create(fileUrl); 21 using (HttpWebResponse wresp = (HttpWebResponse)wreq.GetResponse()) 22 { 23 Stream s = wresp.GetResponseStream(); 24 System.Drawing.Image img; 25 img = System.Drawing.Image.FromStream(s); 26 path = path + fileName; 27 img.Save(path, fileFormat); //保存 28 } 29 } 30 catch (Exception ex) 31 { 32 throw; 33 } 34 } 35 #endregion 36 37 #region 图片下载【使用流、WebClient进行保存】 38 /// <summary> 39 /// 图片下载【使用流、WebClient进行保存】 40 /// </summary> 41 /// <param name="fileUrl">图片URL地址(例如:http://img.baidu.com/video/img/video_logo_new.gif) </param> 42 /// <param name="path">存储到本地(服务器)路径(例如:Upload/Image)</param> 43 /// <param name="fileName">文件名称(包含后缀名)</param> 44 /// <param name="fileFormat">图片格式</param> 45 public static void WebClientDownloadFileImage(string fileUrl, string path, string fileName, System.Drawing.Imaging.ImageFormat fileFormat) 46 { 47 try 48 { 49 path = HttpContext.Current.Server.MapPath(string.Format("~/{0}/", path)); 50 if (!Directory.Exists(path)) //判断目录是否存在 51 { 52 Directory.CreateDirectory(path);//创建该文件 53 } 54 WebClient webClient = new WebClient(); 55 byte[] imgByte; 56 imgByte = webClient.DownloadData(fileUrl); 57 using (MemoryStream ms = new MemoryStream(imgByte)) 58 { 59 System.Drawing.Image img; 60 img = System.Drawing.Image.FromStream(ms); 61 path = path + fileName; 62 img.Save(path, fileFormat); //保存 63 } 64 } 65 catch (Exception ex) 66 { 67 throw; 68 } 69 70 } 71 #endregion 72 #endregion 73 74 #region 文件下载(从第三方服务器下载到本服务器) 75 76 #region 下载(第三方)远程文件保存到本地(自己服务器)的方法、保存抓取远程图片【异步下载】 77 /// <summary> 78 /// 下载(第三方)远程图片保存到本地(自己服务器)的方法、保存抓取远程图片 【异步下载】 79 /// </summary> 80 /// <param name="fileUrl">文件URL地址(例如:http://img.baidu.com/video/img/video_logo_new.gif) </param> 81 /// <param name="path">存储到本地(服务器)路径(例如:Upload/Image)</param> 82 /// <param name="fileName">文件名称(包括后缀名)(例如:login.jpg)</param> 83 public static void DownloadFileAsync(string fileUrl, string path, string fileName) 84 { 85 try 86 { 87 System.Net.WebClient client = new System.Net.WebClient(); 88 path = HttpContext.Current.Server.MapPath(string.Format("~/{0}/", path)); 89 if (!Directory.Exists(path)) //判断目录是否存在 90 { 91 Directory.CreateDirectory(path);//创建该文件 92 } 93 path = path + fileName; 94 client.DownloadFileAsync(new Uri(fileUrl, UriKind.RelativeOrAbsolute), path); 95 } 96 catch (Exception ex) 97 { 98 99 } 100 } 101 #endregion 102 103 #region 下载(第三方)远程文件保存到本地(自己服务器)的方法、保存抓取远程图片【同步下载】 104 /// <summary> 105 /// 下载(第三方)远程图片保存到本地(自己服务器)的方法、保存抓取远程图片 【同步下载】 106 /// </summary> 107 /// <param name="fileUrl">文件URL地址(例如:http://img.baidu.com/video/img/video_logo_new.gif) </param> 108 /// <param name="path">存储到本地(服务器)路径(例如:Upload/Image)</param> 109 /// <param name="fileName">文件名称(包括后缀名)(例如:login.jpg)</param> 110 public static void DownloadFile(string fileUrl, string path, string fileName) 111 { 112 try 113 { 114 System.Net.WebClient client = new System.Net.WebClient(); 115 path = HttpContext.Current.Server.MapPath(string.Format("~/{0}/", path)); 116 if (!Directory.Exists(path)) //判断目录是否存在 117 { 118 Directory.CreateDirectory(path);//创建该文件 119 } 120 path = path + fileName; 121 client.DownloadFile(new Uri(fileUrl, UriKind.RelativeOrAbsolute), path); 122 } 123 catch (Exception ex) 124 { 125 126 } 127 } 128 #endregion 129 130 #endregion
将图片的二进制字节字符串在HTML页面以图片形式输出
具体实现代码如下:
1、新建一个一般处理程序: Image.ashx
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using System.Net; 6 using System.Drawing.Imaging; 7 using System.IO; 8 9 namespace Test 10 { 11 /// <summary> 12 ///测试图片以二进制字节输出到HTML页面(显示成图片) 13 /// </summary> 14 public class Image : IHttpHandler 15 { 16 17 public void ProcessRequest(HttpContext context) 18 { 19 //方法一: 20 //WebRequest wreq = WebRequest.Create("http://img.baidu.com/video/img/video_logo_new.gif"); 21 //HttpWebResponse wresp = (HttpWebResponse)wreq.GetResponse(); 22 //Stream s = wresp.GetResponseStream(); 23 //System.Drawing.Image img; 24 //img = System.Drawing.Image.FromStream(s); 25 ////下面直接输出 26 //MemoryStream ms = new MemoryStream(); 27 //img.Dispose(); 28 29 //关键代码 30 //context.Response.ClearContent(); 31 //context.Response.ContentType = "image/gif"; 32 //context.Response.BinaryWrite(ms.ToArray()); 33 34 //方法二: 35 WebClient my = new WebClient(); 36 byte[] mybyte; 37 mybyte = my.DownloadData("http://img.baidu.com/video/img/video_logo_new.gif"); 38 MemoryStream ms = new MemoryStream(mybyte); 39 System.Drawing.Image img; 40 img = System.Drawing.Image.FromStream(ms); 41 //关键代码 42 context.Response.ClearContent(); 43 context.Response.ContentType = "image/gif"; 44 context.Response.BinaryWrite(mybyte); 45 } 46 47 public bool IsReusable 48 { 49 get 50 { 51 return false; 52 } 53 } 54 } 55 }
2、新建一个HTML页面:ImageTest.htm
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title></title> 5 </head> 6 <body> 7 使用:Response.BinaryWrite 二进制字符串方式输出图片:<br /> 8 主要:图片 img标签路径(src)要指向那个(Image.ashx)一般处理程序<br /> 9 <img src="Image.ashx"/> 10 </body> 11 </html>
asp.net 文件 操作方法
1 /// <summary> 2 /// 移动文件 3 /// </summary> 4 /// <param name="oldPath">源文件路径</param> 5 /// <param name="newPath">目标文件路径</param> 6 /// <param name="fileName">文件名称</param> 7 public static void MoveFile(string oldPath, string newPath, string fileName) 8 { 9 if (!Directory.Exists(newPath)) 10 { 11 //不存在则自动创建文件夹 12 Directory.CreateDirectory(newPath); 13 } 14 File.Move(oldPath + fileName, newPath + fileName); 15 } 16 17 /// <summary> 18 /// 批量移动文件 19 /// </summary> 20 /// <param name="oldPath">源文件路径</param> 21 /// <param name="newPath">目标文件路径</param> 22 /// <param name="fileNameList">文件名称</param> 23 public static void MoveFile(string oldPath, string newPath, ArrayList fileNameList) 24 { 25 if (!Directory.Exists(newPath)) 26 { 27 //不存在则自动创建文件夹 28 Directory.CreateDirectory(newPath); 29 } 30 for (int i = 0; i < fileNameList.Count; i++) 31 { 32 File.Move(oldPath + fileNameList[i], newPath + fileNameList[i]); 33 } 34 } 35 36 /// <summary> 37 /// 删除文件 38 /// </summary> 39 /// <param name="path">文件路径</param> 40 /// <returns>删除结果,成功或失败</returns> 41 public static bool DeleteFile(string path) 42 { 43 try 44 { 45 File.Delete(path); 46 return true; 47 } 48 catch 49 { 50 return false; 51 } 52 } 53 54 /// <summary> 55 /// 删除文件夹 56 /// </summary> 57 /// <param name="path">文件夹路径</param> 58 /// <returns>删除结果,成功或失败</returns> 59 public static bool DeleteFolder(string path) 60 { 61 try 62 { 63 Directory.Delete(path); 64 return true; 65 } 66 catch 67 { 68 return false; 69 } 70 } 71 72 /// <summary> 73 /// 移动文件夹 74 /// </summary> 75 /// <param name="oldPath">源文件夹路径</param> 76 /// <param name="newPath">目标文件夹路径</param> 77 /// <returns>移动结果</returns> 78 public static bool MoveFolder(string oldPath, string newPath) 79 { 80 try 81 { 82 Directory.Move(oldPath, newPath); 83 return true; 84 } 85 catch 86 { 87 return false; 88 } 89 }