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利用WebClient类向服务器上载文件

王朝other·作者佚名  2006-01-08
窄屏简体版  字體: |||超大  

利用WebClient类向服务器上载文件

作者: 孟宪会 出自: 【孟宪会之精彩世界】 发布日期: 2003-7-30 17:44:10

.NET 提供了许多上载文件的方法,在Windows Form应用程序中,我们可以使用WebClient类来实现。WebClient类也有两个方法可以上载,UploadFile和OpenWrite方法,下面就是一个实际的例子,两种方法都有代码:

结果如下:

C#代码如下:

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Net;

using System.Text;

using System.IO;

namespace UploadFile

{

public class Form1 : System.Windows.Forms.Form

{

private System.Windows.Forms.Label label1;

private System.Windows.Forms.Label label2;

private System.Windows.Forms.Button button1;

private System.Windows.Forms.Label label3;

private System.Windows.Forms.Button button2;

private System.Windows.Forms.TextBox txtFileName;

private System.Windows.Forms.TextBox txtServerPath;

private System.Windows.Forms.LinkLabel linkLabel1;

private System.ComponentModel.Container components = null;

public Form1()

{

InitializeComponent();

}

protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

#region Windows Form Designer generated code

private void InitializeComponent()

{

System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));

this.label1 = new System.Windows.Forms.Label();

this.txtServerPath = new System.Windows.Forms.TextBox();

this.label2 = new System.Windows.Forms.Label();

this.button1 = new System.Windows.Forms.Button();

this.txtFileName = new System.Windows.Forms.TextBox();

this.label3 = new System.Windows.Forms.Label();

this.button2 = new System.Windows.Forms.Button();

this.linkLabel1 = new System.Windows.Forms.LinkLabel();

this.SuspendLayout();

//

// label1

//

this.label1.ForeColor = System.Drawing.Color.Red;

this.label1.Location = new System.Drawing.Point(8, 96);

this.label1.Name = "label1";

this.label1.Size = new System.Drawing.Size(448, 16);

this.label1.TabIndex = 0;

this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;

//

// txtServerPath

//

this.txtServerPath.Location = new System.Drawing.Point(128, 8);

this.txtServerPath.Name = "txtServerPath";

this.txtServerPath.Size = new System.Drawing.Size(320, 21);

this.txtServerPath.TabIndex = 1;

this.txtServerPath.Text = "http://mengxianhui/aspxWeb/Images/";

//

// label2

//

this.label2.AutoSize = true;

this.label2.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold,

System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

this.label2.ForeColor = System.Drawing.Color.Navy;

this.label2.Location = new System.Drawing.Point(8, 12);

this.label2.Name = "label2";

this.label2.Size = new System.Drawing.Size(116, 17);

this.label2.TabIndex = 2;

this.label2.Text = "请输入服务器地址:";

this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;

//

// button1

//

this.button1.Location = new System.Drawing.Point(192, 64);

this.button1.Name = "button1";

this.button1.TabIndex = 3;

this.button1.Text = "上载文件";

this.button1.Click += new System.EventHandler(this.button1_Click);

this.button1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.button1_MouseDown);

//

// txtFileName

//

this.txtFileName.Location = new System.Drawing.Point(128, 32);

this.txtFileName.Name = "txtFileName";

this.txtFileName.Size = new System.Drawing.Size(232, 21);

this.txtFileName.TabIndex = 4;

this.txtFileName.Text = "";

//

// label3

//

this.label3.AutoSize = true;

this.label3.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold,

System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

this.label3.ForeColor = System.Drawing.Color.DarkBlue;

this.label3.Location = new System.Drawing.Point(8, 38);

this.label3.Name = "label3";

this.label3.Size = new System.Drawing.Size(116, 17);

this.label3.TabIndex = 5;

this.label3.Text = "请输入上传文件名:";

this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;

//

// button2

//

this.button2.Location = new System.Drawing.Point(370, 32);

this.button2.Name = "button2";

this.button2.Size = new System.Drawing.Size(80, 23);

this.button2.TabIndex = 6;

this.button2.Text = "浏览文件…";

this.button2.Click += new System.EventHandler(this.button2_Click);

//

// linkLabel1

//

this.linkLabel1.Location = new System.Drawing.Point(16, 120);

this.linkLabel1.Name = "linkLabel1";

this.linkLabel1.Size = new System.Drawing.Size(440, 24);

this.linkLabel1.TabIndex = 7;

this.linkLabel1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;

this.linkLabel1.LinkClicked += new

System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel1_LinkClicked);

//

// Form1

//

this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

this.BackColor = System.Drawing.SystemColors.Control;

this.ClientSize = new System.Drawing.Size(464, 157);

this.Controls.Add(this.linkLabel1);

this.Controls.Add(this.button2);

this.Controls.Add(this.txtFileName);

this.Controls.Add(this.label3);

this.Controls.Add(this.txtServerPath);

this.Controls.Add(this.label2);

this.Controls.Add(this.button1);

this.Controls.Add(this.label1);

this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));

this.Name = "Form1";

this.Text = "WebClient 上传文件的例子";

this.Resize += new System.EventHandler(this.Form1_Resize);

this.ResumeLayout(false);

}

#endregion

[STAThread]

static void Main()

{

Application.Run(new Form1());

}

///

/// .NET SDK 上面的打开文件的类

///

private FileStream OpenFile()

{

OpenFileDialog dlgOpenFile = new OpenFileDialog();

dlgOpenFile.ShowReadOnly = true;

if(dlgOpenFile.ShowDialog() == DialogResult.OK)

{

if(dlgOpenFile.ReadOnlyChecked == true)

{

return (FileStream)dlgOpenFile.OpenFile();

}

else

{

string path = dlgOpenFile.FileName;

return new FileStream(path, System.IO.FileMode.Open,

System.IO.FileAccess.ReadWrite);

}

}

return null;

}

private void button2_Click(object sender, System.EventArgs e)

{

OpenFileDialog dlgOpenFile = new OpenFileDialog();

dlgOpenFile.InitialDirectory = @"C:\";

dlgOpenFile.ShowReadOnly = false;

dlgOpenFile.ReadOnlyChecked = true;

dlgOpenFile.Filter = "所有文件 (*.*)|*.*";

if(dlgOpenFile.ShowDialog() == DialogResult.OK)

{

if(dlgOpenFile.ReadOnlyChecked == true)

{

txtFileName.Text = dlgOpenFile.FileName.ToString();

}

}

}

private void button1_Click(object sender, System.EventArgs e)

{

// 需要注意的是:txtServerPath文件夹有匿名可写的权限。

// 可以自己定义新文件名字

if(txtFileName.Text.Trim() == "" || txtServerPath.Text.Trim() == "")

{

MessageBox.Show("请输入你要上载的文件名字!","错误:", MessageBoxButtons.OK,

MessageBoxIcon.Information);

}

else

{

/// 得到文件名,文件扩展名字,服务器路径

string fileNamePath = txtFileName.Text.Trim();

string uriString = txtServerPath.Text.Trim();

string fileName = fileNamePath.Substring(fileNamePath.LastIndexOf("\\") + 1);

string fileNameExt = fileName.Substring(fileName.LastIndexOf(".") + 1);

if(uriString.EndsWith("/") == false) uriString = uriString + "/";

uriString = uriString + fileName;

/// 创建WebClient实例

WebClient myWebClient = new WebClient();

myWebClient.Credentials = CredentialCache.DefaultCredentials;

// 要上传的文件

FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);

//FileStream fs = OpenFile();

BinaryReader r = new BinaryReader(fs);

try

{

//使用UploadFile方法可以用下面的格式

//myWebClient.UploadFile(uriString,"PUT",fileNamePath);

byte[] postArray = r.ReadBytes((int)fs.Length);

Stream postStream = myWebClient.OpenWrite(uriString,"PUT");

if(postStream.CanWrite)

{

postStream.Write(postArray,0,postArray.Length);

label1.Text = fileName + "上传成功!";

}

else

{

label1.Text = "文件目前不可写!";

}

postStream.Close();

linkLabel1.Text = "查看上载的文件";

for(int i = linkLabel1.Links.Count - 1;i-1;i--)

linkLabel1.Links.Remove(linkLabel1.Links[i]);

linkLabel1.Links.Add(0,linkLabel1.Text.Length,uriString);

}

catch(WebException errMsg)

{

label1.Text="上传失败:" + errMsg.Message;

}

}

}

private void linkLabel1_LinkClicked(object sender, System.Windows.Forms.LinkLabelLinkClickedEventArgs e)

{

this.WindowState = FormWindowState.Minimized;

this.linkLabel1.Links[linkLabel1.Links.IndexOf(e.Link)].Visited = true;

string target = e.Link.LinkData as string;

if(null != target)

{

System.Diagnostics.Process.Start(target);

}

else

{

MessageBox.Show("请用浏览器访问:" + target);

}

}

private void Form1_Resize(object sender, System.EventArgs e)

{

if(this.WindowState == FormWindowState.Maximized) this.WindowState = FormWindowState.Normal;

}

private void button1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)

{

if(txtFileName.Text.Trim() != "" && txtServerPath.Text.Trim() != "")

label1.Text = "正在上传文件,请稍侯……!";

}

}

}

 
 
 
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