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 }