C# 使用 FtpWebResponse 编写GUI 简易 FTP客户端

Question

1. using System;
2. using System.Collections.Generic;
3. using System.ComponentModel;
4. using System.Data;
5. using System.Drawing;
6. using System.Windows.Forms;
7. using System.Net;
8. using System.IO;
10. class FtpClientForm : Form {
11.     public FtpClientForm() {
12.         InitializeComponent();
13.     }
15.     private string serverDirectory;
17.     private void OnOpen(object sender, EventArgs e) {
18.         Cursor currentCursor = this.Cursor;
19.         FtpWebResponse response = null;
20.         Stream stream = null;
21.         this.Cursor = Cursors.WaitCursor;
23.         FtpWebRequest request = (FtpWebRequest)WebRequest.Create(textServer.Text);
24.         request.Credentials = new NetworkCredential(textUsername.Text,
25.               textPassword.Text);
26.         request.Method = WebRequestMethods.Ftp.ListDirectory;
28.         response = (FtpWebResponse)request.GetResponse();
30.         stream = response.GetResponseStream();
31.         FillDirectoryList(stream);
33.         serverDirectory = null;
34.         buttonOpenDirectory.Enabled = false;
35.         buttonGetFile.Enabled = false;
37.         if (response != null)
38.             response.Close();
39.         if (stream != null)
40.             stream.Close();
41.         this.Cursor = currentCursor;
42.     }
44.     private void FillDirectoryList(Stream stream) {
45.         StreamReader reader = new StreamReader(stream);
46.         string content = reader.ReadToEnd();
47.         string[] files = content.Split('n');
48.         listFiles.DataSource = files;
49.         reader.Close();
50.     }
52.     private void OnOpenDirectory(object sender, EventArgs e) {
53.         FtpWebResponse response = null;
54.         Stream stream = null;
55.         string subDirectory = listFiles.SelectedValue.ToString().Trim();
56.         serverDirectory += @"/" + subDirectory;
57.         Uri baseUri = new Uri(textServer.Text);
58.         Uri uri = new Uri(baseUri, serverDirectory);
60.         FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
61.         request.Credentials = new NetworkCredential(textUsername.Text,
62.               textPassword.Text);
64.         request.Method = WebRequestMethods.Ftp.ListDirectory;
65.         response = (FtpWebResponse)request.GetResponse();
67.         stream = response.GetResponseStream();
68.         FillDirectoryList(stream);
69.         if (response != null)
70.             response.Close();
71.         if (stream != null)
72.             stream.Close();
73.     }
75.     private void OnDownloadFile(object sender, EventArgs e) {
76.         FtpWebResponse response = null;
77.         Stream inStream = null;
78.         Stream outStream = null;
79.         Uri baseUri = new Uri(textServer.Text);
81.         string filename = listFiles.SelectedValue.ToString().Trim();
82.         string fullFilename = serverDirectory + @"/" + filename;
84.         Uri uri = new Uri(baseUri, fullFilename);
86.         FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
87.         request.Credentials = new NetworkCredential(textUsername.Text,textPassword.Text);
88.         request.Method = WebRequestMethods.Ftp.DownloadFile;
89.         request.UseBinary = checkBoxBinary.Checked;
91.         response = (FtpWebResponse)request.GetResponse();
93.         inStream = response.GetResponseStream();
95.         saveFileDialog1.FileName = filename;
97.         if (saveFileDialog1.ShowDialog() == DialogResult.OK) {
98.             outStream = File.OpenWrite(saveFileDialog1.FileName);
99.             byte[] buffer = new byte[4096];
100.             int size = 0;
101.             while ((size = inStream.Read(buffer, 0, 4096)) > 0) {
102.                 outStream.Write(buffer, 0, size);
103.             }
104.         }
106.         if (inStream != null)
107.             inStream.Close();
108.         if (outStream != null)
109.             outStream.Close();
110.         if (response != null)
111.             response.Close();
113.     }
115.     private void OnFileSelection(object sender, EventArgs e) {
116.         this.buttonGetFile.Enabled = true;
117.         this.buttonOpenDirectory.Enabled = true;
118.     }
119.     private void InitializeComponent() {
120.         this.label1 = new System.Windows.Forms.Label();
121.         this.textServer = new System.Windows.Forms.TextBox();
122.         this.buttonOpen = new System.Windows.Forms.Button();
123.         this.statusStrip1 = new System.Windows.Forms.StatusStrip();
124.         this.listFiles = new System.Windows.Forms.ListBox();
125.         this.buttonOpenDirectory = new System.Windows.Forms.Button();
126.         this.buttonGetFile = new System.Windows.Forms.Button();
127.         this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
128.         this.checkBoxBinary = new System.Windows.Forms.CheckBox();
129.         this.label2 = new System.Windows.Forms.Label();
130.         this.label3 = new System.Windows.Forms.Label();
131.         this.textUsername = new System.Windows.Forms.TextBox();
132.         this.textPassword = new System.Windows.Forms.TextBox();
133.         this.SuspendLayout();
134.         this.label1.AutoSize = true;
135.         this.label1.Location = new System.Drawing.Point(28, 31);
136.         this.label1.Size = new System.Drawing.Size(37, 13);
137.         this.label1.Text = "Server:";
138.         this.textServer.Location = new System.Drawing.Point(109, 31);
139.         this.textServer.Size = new System.Drawing.Size(146, 20);
140.         this.textServer.Text = "ftp://";
141.         this.buttonOpen.Location = new System.Drawing.Point(371, 31);
142.         this.buttonOpen.Size = new System.Drawing.Size(103, 23);
143.         this.buttonOpen.Text = "Open";
144.         this.buttonOpen.Click += new System.EventHandler(this.OnOpen);
145.         this.statusStrip1.LayoutStyle = System.Windows.Forms.ToolStripLayoutStyle.Table;
146.         this.statusStrip1.Location = new System.Drawing.Point(0, 0);
147.         this.statusStrip1.Size = new System.Drawing.Size(496, 18);
148.         this.statusStrip1.Text = "statusStrip1";
149.         this.listFiles.FormattingEnabled = true;
150.         this.listFiles.Location = new System.Drawing.Point(28, 149);
151.         this.listFiles.Size = new System.Drawing.Size(315, 160);
152.         this.listFiles.SelectedIndexChanged += new System.EventHandler(this.OnFileSelection);
153.         this.buttonOpenDirectory.Enabled = false;
154.         this.buttonOpenDirectory.Location = new System.Drawing.Point(371, 77);
155.         this.buttonOpenDirectory.Name = "buttonOpenDirectory";
156.         this.buttonOpenDirectory.Size = new System.Drawing.Size(103, 23);
157.         this.buttonOpenDirectory.TabIndex = 8;
158.         this.buttonOpenDirectory.Text = "Open Directory";
159.         this.buttonOpenDirectory.Click += new System.EventHandler(this.OnOpenDirectory);
160.         this.buttonGetFile.Enabled = false;
161.         this.buttonGetFile.Location = new System.Drawing.Point(371, 122);
162.         this.buttonGetFile.Size = new System.Drawing.Size(103, 23);
163.         this.buttonGetFile.Text = "Get File";
164.         this.buttonGetFile.Click += new System.EventHandler(this.OnDownloadFile);
165.         this.checkBoxBinary.AutoSize = true;
166.         this.checkBoxBinary.Checked = true;
167.         this.checkBoxBinary.CheckState = System.Windows.Forms.CheckState.Checked;
168.         this.checkBoxBinary.Location = new System.Drawing.Point(371, 190);
169.         this.checkBoxBinary.Size = new System.Drawing.Size(81, 17);
170.         this.checkBoxBinary.Text = "Binary Mode";
171.         this.label2.AutoSize = true;
172.         this.label2.Location = new System.Drawing.Point(28, 62);
173.         this.label2.Size = new System.Drawing.Size(54, 13);
174.         this.label2.Text = "Username:";
175.         this.label3.AutoSize = true;
176.         this.label3.Location = new System.Drawing.Point(28, 101);
177.         this.label3.Size = new System.Drawing.Size(52, 13);
178.         this.label3.Text = "Password:";
179.         this.textUsername.Location = new System.Drawing.Point(109, 62);
180.         this.textUsername.Size = new System.Drawing.Size(146, 20);
181.         this.textUsername.Text = "Anonymous";
182.         this.textPassword.Location = new System.Drawing.Point(109, 101);
183.         this.textPassword.PasswordChar = '?';
184.         this.textPassword.Size = new System.Drawing.Size(146, 20);
185.         this.textPassword.UseSystemPasswordChar = true;
186.         this.ClientSize = new System.Drawing.Size(496, 353);
187.         this.Controls.Add(this.textPassword);
188.         this.Controls.Add(this.textUsername);
189.         this.Controls.Add(this.label3);
190.         this.Controls.Add(this.label2);
191.         this.Controls.Add(this.checkBoxBinary);
192.         this.Controls.Add(this.buttonGetFile);
193.         this.Controls.Add(this.buttonOpenDirectory);
194.         this.Controls.Add(this.listFiles);
195.         this.Controls.Add(this.buttonOpen);
196.         this.Controls.Add(this.textServer);
197.         this.Controls.Add(this.label1);
198.         this.Text = "FTP Client";
199.         this.ResumeLayout(false);
200.         this.PerformLayout();
202.     }
203.     private System.Windows.Forms.Label label1;
204.     private System.Windows.Forms.TextBox textServer;
205.     private System.Windows.Forms.Button buttonOpen;
206.     private System.Windows.Forms.StatusStrip statusStrip1;
207.     private System.Windows.Forms.ListBox listFiles;
208.     private System.Windows.Forms.Button buttonOpenDirectory;
209.     private System.Windows.Forms.Button buttonGetFile;
210.     private System.Windows.Forms.SaveFileDialog saveFileDialog1;
211.     private System.Windows.Forms.CheckBox checkBoxBinary;
212.     private System.Windows.Forms.Label label2;
213.     private System.Windows.Forms.Label label3;
214.     private System.Windows.Forms.TextBox textUsername;
215.     private System.Windows.Forms.TextBox textPassword;
216.     [STAThread]
217.     static void Main() {
218.         Application.EnableVisualStyles();
219.         Application.Run(new FtpClientForm());
220.     }
221. }

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