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ASP.NETFTP的操作（包括上传、下载、重命名、删除、检查是否存在） ...

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

ASP.NET中，有时候会遇到把文件上传到ftp或者从ftp上下载文件的操作，下文针对这些操作一一展开。

首先，引用命名空间。

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 
 6 using System.Text;
 7 using System.Net;
 8 using System.Data;
 9 using System.IO;
10 using System.ComponentModel;

其中，前四个是新建ASP.NET时自动添加的，后五个为手动添加。

然后，在class1类中(假设新添加的类为class1)声明全局变量，即ftp登陆所需的用户名和密码。

1  private string ftpUser = "username";   //ftp用户名
2  private string ftpPassword = "12345";   //ftp密码

接着就是上传、下载、重命名、删除和检查存在的方法了。

1.上传文件到ftp

上传的方法代码如下：

 1         /// <summary>
 2         /// 上传文件
 3         /// </summary>
 4         /// <param name="localFile1">本地文件路径及文件名</param>
 5         /// <param name="ftpFileName">ftp文件路径及文件名（文件名可重命名）</param>
 6         /// <returns>返回bool值</returns>
 7         public bool fileUpload(string localFile1, string ftpFileName)
 8         {
 9             FileInfo localFile = new FileInfo(localFile1);
10             bool success = false;
11             FtpWebRequest ftpWebRequest = null;
12             FileStream localFileStream = null;
13             Stream requestStream = null;
14             try
15             {
16                 string uri = ftpFileName;
17                 ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
18                 ftpWebRequest.Credentials = new NetworkCredential(ftpUser, ftpPassword);
19                 ftpWebRequest.UseBinary = true;//指定数据传输类型为二进制
20                 ftpWebRequest.KeepAlive = false;//成功执行一个命令后连接被关闭
21                 ftpWebRequest.Method = WebRequestMethods.Ftp.UploadFile;// 指定执行什么命令
22                 ftpWebRequest.ContentLength = localFile.Length;//上传文件时通知服务器文件的大小 
23                 int buffLength = 20480;// 缓冲大小设置为20kb
24                 byte[] buff = new byte[buffLength];
25                 int contentLen;
26                 localFileStream = localFile.OpenRead();//打开一个文件流去读上传的文件
27                 requestStream = ftpWebRequest.GetRequestStream();//把上传的文件写入流
28                 contentLen = localFileStream.Read(buff, 0, buffLength);//每次读文件流的2kb
29                 while (contentLen != 0)// 流内容没有结束
30                 {
31                     // 把内容从file stream 写入 upload stream
32                     requestStream.Write(buff, 0, contentLen);
33                     contentLen = localFileStream.Read(buff, 0, buffLength);
34                 }
35                 success = true;
36             }
37             catch (Exception)
38             {
39                 success = false;
40             }
41             finally
42             {
43                 if (requestStream != null)
44                 {
45                     requestStream.Close();
46                 }
47                 if (localFileStream != null)
48                 {
49                     localFileStream.Close();
50                 }
51             }
52             return success;
53         }

调用方法为实例化类对象，然后通过类对象直接调用。

示例：假设该方法包含在class1类中（以下方法均假设包含在class1中），则有：

1   class1 ftpClient1 = new class1();  //实例化类FTPClient
2   ftpClient1.fileUpload("D:\\456.png", "ftp://192.18.13.11/123.png");    //上传文件

另一种方法支持断点续传的方法如下：

添加命名空间：

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 
 6 using System.IO;
 7 using System.Net;
 8 using System.Net.Security;
 9 using System.Collections;
10 
11 using System.Security.Cryptography.X509Certificates;
12 
13 using System.Web.Configuration;

class1类中的代码如下：

 1     public class class1
 2     {
 3         private NetworkCredential certificate;
 4         /// <summary>
 5         /// 构造函数，提供初始化数据的功能，打开Ftp站点
 6         /// </summary>
 7         public class1()
 8         {
 9             certificate = new NetworkCredential("administrator", "cnugis202");
10         }
11         /// <summary>
12         /// 创建FTP请求
13         /// </summary>
14         /// <param name="uri">ftp://myserver/upload.txt</param>
15         /// <param name="method">Upload/Download</param>
16         /// <returns></returns>
17         private FtpWebRequest CreateFtpWebRequest(Uri uri, string method)
18         {
19             FtpWebRequest ftpClientRequest = (FtpWebRequest)WebRequest.Create(uri);
20             ftpClientRequest.Proxy = null;
21             ftpClientRequest.Credentials = certificate;
22             ftpClientRequest.KeepAlive = true;
23             ftpClientRequest.UseBinary = true;
24             ftpClientRequest.UsePassive = true;
25             ftpClientRequest.Method = method;
26             //ftpClientRequest.Timeout = -1;
27             return ftpClientRequest;
28         }
29         //支持断点续传
30         public bool UploadFile(string sourceFile, Uri destinationPath, int offSet, string ftpMethod)
31         {
32             try
33             {
34                 FileInfo file = new FileInfo(sourceFile);
35                 Uri uri = new Uri(destinationPath.AbsoluteUri + "/" + file.Name);
36                 FtpWebRequest request = CreateFtpWebRequest(uri, ftpMethod);
37                 request.ContentOffset = offSet;
38                 Stream requestStream = request.GetRequestStream();//需要获取文件的流
39                 FileStream fileStream = new FileStream(sourceFile, FileMode.Open, FileAccess.Read);//创建存储文件的流
40                 int sourceLength = (int)fileStream.Length;
41                 offSet = CopyDataToDestination(fileStream, requestStream, offSet);
42                 WebResponse response = request.GetResponse();
43                 response.Close();
44                 if (offSet != 0)
45                 {
46                     UploadFile(sourceFile, destinationPath, offSet, WebRequestMethods.Ftp.AppendFile);
47                 }
48             }
49             catch (Exception ex)
50             {
51                 ex.ToString();
52                 return false;
53             }
54             return true;
55         }
56         private int CopyDataToDestination(Stream sourceStream, Stream destinationStream, int offSet)
57         {
58             try
59             {
60                 int sourceLength = (int)sourceStream.Length;
61                 int length = sourceLength - offSet;
62                 byte[] buffer = new byte[length + offSet];
63                 int bytesRead = sourceStream.Read(buffer, offSet, length);
64                 while (bytesRead != 0)
65                 {
66                     destinationStream.Write(buffer, 0, bytesRead);
67                     bytesRead = sourceStream.Read(buffer, 0, length);
68                     length = length - bytesRead;
69                     offSet = (bytesRead == 0) ? 0 : (sourceLength - length);//(length - bytesRead);                  
70                 }
71             }
72             catch (Exception ex)
73             {
74                 string error = ex.ToString();
75                 return offSet;
76             }
77             finally
78             {
79                 destinationStream.Close();
80                 sourceStream.Close();
81             }
82             return offSet;
83         }
84     }

调用方法为：

1 class1 ftpClientService = new class1();   //实例化class1类对象
2 ftpClientService.UploadFile("D:\\456.png",  new Uri("ftp://192.18.13.11/123.png“), 0, WebRequestMethods.Ftp.UploadFile);//调用class1类的UploadFile方法上传

2.从ftp下载文件

下载的方法代码如下：

 1         /// <summary> 
 2         /// 下载文件 
 3         /// </summary> 
 4         /// <param name="localFileName">下载的ftp的文件路径及文件名</param> 
 5         /// <param name="ftpFileName">本地文件路径及文件名（文件名可重命名）</param> 
 6         /// <returns>返回值</returns>
 7         public bool fileDownload(string ftpFileName, string localFileName)
 8         {
 9             bool success = false;
10             FtpWebRequest ftpWebRequest = null;
11             FtpWebResponse ftpWebResponse = null;
12             Stream ftpResponseStream = null;
13             FileStream outputStream = null;
14             try
15             {
16                 outputStream = new FileStream(localFileName, FileMode.Create);
17                 string uri = ftpFileName;
18                 ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
19                 ftpWebRequest.Credentials = new NetworkCredential(ftpUser, ftpPassword);
20                 ftpWebRequest.UseBinary = true;
21                 ftpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile;
22                 ftpWebResponse = (FtpWebResponse)ftpWebRequest.GetResponse();
23                 ftpResponseStream = ftpWebResponse.GetResponseStream();
24                 long contentLength = ftpWebResponse.ContentLength;
25                 int bufferSize = 20480;
26                 byte[] buffer = new byte[bufferSize];
27                 int readCount;
28                 readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
29                 while (readCount > 0)
30                 {
31                     outputStream.Write(buffer, 0, readCount);
32                     readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
33                 }
34                 success = true;
35             }
36             catch (Exception)
37             {
38                 success = false;
39             }
40             finally
41             {
42                 if (outputStream != null)
43                 {
44                     outputStream.Close();
45                 }
46                 if (ftpResponseStream != null)
47                 {
48                     ftpResponseStream.Close();
49                 }
50                 if (ftpWebResponse != null)
51                 {
52                     ftpWebResponse.Close();
53                 }
54             }
55             return success;
56         }

调用方法为：

1 　　　　　　　class1 ftpClient2 = new class1();  //实例化类FTPClient
2             ftpClient2.fileDownload(ftp://192.18.13.11/123.png","D:\\123.png);     //下载文件

3.在ftp上重命名文件

对ftp文件的重命名，方法代码如下：

 1         /// <summary> 
 2         /// 重命名 
 3         /// </summary> 
 4         /// <param name="ftpPath">ftp文件路径(不包含文件名)</param> 
 5         /// <param name="currentFilename">ftp文件的当前文件名</param> 
 6         /// <param name="newFilename">ftp文件的重命名后的新文件名</param> 
 7         /// <returns>返回值</returns>
 8         public bool fileRename(string ftpPath, string currentFileName, string newFileName)
 9         {
10             bool success = false;
11             FtpWebRequest ftpWebRequest = null;
12             FtpWebResponse ftpWebResponse = null;
13             Stream ftpResponseStream = null;
14             try
15             {
16                 string uri = ftpPath + currentFileName;
17                 ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
18                 ftpWebRequest.Credentials = new NetworkCredential(ftpUser, ftpPassword);
19                 ftpWebRequest.UseBinary = true;
20                 ftpWebRequest.Method = WebRequestMethods.Ftp.Rename;
21                 ftpWebRequest.RenameTo = newFileName;
22                 ftpWebResponse = (FtpWebResponse)ftpWebRequest.GetResponse();
23                 ftpResponseStream = ftpWebResponse.GetResponseStream();
24             }
25             catch (Exception)
26             {
27                 success = false;
28             }
29             finally
30             {
31                 if (ftpResponseStream != null)
32                 {
33                     ftpResponseStream.Close();
34                 }
35                 if (ftpWebResponse != null)
36                 {
37                     ftpWebResponse.Close();
38                 }
39             }
40             return success;
41         }

调用方法为：

1             class1 ftpClient3 = new class1();  //实例化类对象
2             ftpClient3.fileRename(ftp://192.18.13.11/, "123.png", "456.png");      //ftp上重命名文件

 

4.删除ftp上的文件


删除ftp上文件的方法代码为：

 1         /// <summary>
 2         /// 删除文件
 3         /// </summary>
 4         /// <param name="ftpPath">ftp文件路径(不包含文件名)</param>
 5         /// <param name="ftpName">文件名</param>
 6         /// <returns>返回值</returns>
 7         public bool fileDelete(string ftpPath, string ftpName)
 8         {
 9             bool success = false;
10             FtpWebRequest ftpWebRequest = null;
11             FtpWebResponse ftpWebResponse = null;
12             Stream ftpResponseStream = null;
13             StreamReader streamReader = null;
14             try
15             {
16                 string uri = ftpPath + ftpName;
17                 ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
18                 ftpWebRequest.Credentials = new NetworkCredential(ftpUser, ftpPassword);
19                 ftpWebRequest.KeepAlive = false;
20                 ftpWebRequest.Method = WebRequestMethods.Ftp.DeleteFile;
21                 ftpWebResponse = (FtpWebResponse)ftpWebRequest.GetResponse();
22                 long size = ftpWebResponse.ContentLength;
23                 ftpResponseStream = ftpWebResponse.GetResponseStream();
24                 streamReader = new StreamReader(ftpResponseStream);
25                 string result = String.Empty;
26                 result = streamReader.ReadToEnd();
27                 success = true;
28             }
29             catch (Exception)
30             {
31                 success = false;
32             }
33             finally
34             {
35                 if (streamReader != null)
36                 {
37                     streamReader.Close();
38                 }
39                 if (ftpResponseStream != null)
40                 {
41                     ftpResponseStream.Close();
42                 }
43                 if (ftpWebResponse != null)
44                 {
45                     ftpWebResponse.Close();
46                 }
47             }
48             return success;
49         }

调用方法：

1             class1 ftpClient4 = new class1();  //实例化类对象
2             ftpClient4.fileDelete(ftp://192.18.13.11/, "456.png");     //删除ftp文件

5.检查ftp上某文件是否存在

方法代码为：

 1         /// <summary> 
 2         /// 检查文件是否存在 
 3         /// </summary> 
 4         /// <param name="ftpPath"></param> 
 5         /// <param name="ftpName"></param> 
 6         /// <returns></returns> 
 7         public bool fileCheckExist(string ftpPath, string ftpName)
 8         {
 9             bool success = false;
10             FtpWebRequest ftpWebRequest = null;
11             WebResponse webResponse = null;
12             StreamReader reader = null;
13             try
14             {

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