ASP.NET FTP的操作（包括上传、下载、重命名、删除、检查是否存在）
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。
1private string ftpUser = "username"; //ftp用户名
2private 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 ///
2 /// 上传文件
3 ///
4 /// 本地文件路径及文件名
5 /// ftp文件路径及文件名（文件名可重命名）
6 /// 返回bool值
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;
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 ///
5 /// 构造函数，提供初始化数据的功能，打开Ftp站点
6 ///
7 public class1()
8 {
9 certificate = new NetworkCredential("administrator", "cnugis202");
10 }
11 ///
12 /// 创建FTP请求
13 ///
14 /// ftp://myserver/upload.txt
15 /// Upload/Download
16 ///
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;
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 ///
2 /// 下载文件
3 ///
4 /// 下载的ftp的文件路径及文件名
5 /// 本地文件路径及文件名（文件名可重命名）
6 /// 返回值
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;
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 ///
2 /// 重命名
3 ///
4 /// ftp文件路径(不包含文件名)
5 /// ftp文件的当前文件名
6 /// ftp文件的重命名后的新文件名
7 /// 返回值
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 ///
2 /// 删除文件
3 ///
4 /// ftp文件路径(不包含文件名)
5 /// 文件名
6 /// 返回值
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 ///
2 /// 检查文件是否存在
3 ///
4 ///
5 ///
6 ///
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 {
15 string url = ftpPath;
16 ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
17 ftpWebRequest.Credentials = new NetworkCredential(ftpUser, ftpPassword);
18 ftpWebRequest.Method = WebRequestMethods.Ftp.ListDirectory;
19 ftpWebRequest.KeepAlive = false;
20 webResponse = ftpWebRequest.GetResponse();
21 reader = new StreamReader(webResponse.GetResponseStream());
22 string line = reader.ReadLine();
23 while (line != null)
24 {
25 if (line == ftpName)
26 {
27 success = true;
28 break;
29 }
30 line = reader.ReadLine();
31 }
32 }
33 catch (Exception)
34 {
35 success = false;
36 }
37 finally
38 {
39 if (reader != null)
40 {
41 reader.Close();
42 }
43 if (webResponse != null)
44 {
45 webResponse.Close();
46 }
47 }
48 return success;
49 }
调用方法为：
1 class1 ftpClient5 = new class1();//实例化类对象
2 bool flag = ftpClient5.fileCheckExist(ftp://192.18.13.11/, "123.png"); //检查文件是否存在
3 if (flag == true)
4 {
5 this.Response.Write("alert('文件存在！')");
6 }
7 else
8 {
9 this.Response.Write("alert('文件不存在！')");
10 }
页:
[1]