图片上传（练习）_.NET

您所在的位置：程序员俱乐部 > 编程开发 > .NET > 图片上传（练习）

图片上传（练习）

2013/12/21 12:09:15 泷泷博客园我要评论(0)

摘要：前言网站后台都需要有上传图片的功能，下面的例子就是实现有关图片上传。缺点：图片上传到本服务器上，不适合大量图片上传。第一、图片上传，代码如下：1xxx.aspx2<tdclass="style1">3<asp:FileUploadID="FileUpload1"runat="server"/>4<asp:ButtonID="Button1"runat="server"Text="上传一般图片"onclick="Button1_Click"/>5<
标签：图片上传图片上传

前言

网站后台都需要有上传图片的功能，下面的例子就是实现有关图片上传。缺点：图片上传到本服务器上，不适合大量图片上传。

第一、图片上传，代码如下：

class="code_img_closed" src="/Upload/Images/2013122112/0015B68B3C38AA5B.gif" alt="" />logs_code_hide('8025a5a5-26ff-4416-b177-d906baf65652',event)" src="/Upload/Images/2013122112/2B1B950FA3DF188F.gif" alt="" />

 1 xxx.aspx
 2  <td class="style1"> 
 3                 <asp:FileUpload ID="FileUpload1" runat="server"  />
 4                 <asp:Button ID="Button1" runat="server" Text="上传一般图片" onclick="Button1_Click" /> 
 5             </td>
 6             <td class="style3"> 
 7                 <asp:Image ID="Image1" runat="server" Height="200px" Width="200px" /> 
 8             </td>
 9 
10 xxx.aspx.cs
11  protected void Button1_Click(object sender, EventArgs e)
12         {
13             for (int i = 0; i < Request.Files.Count; i++)
14             {
15                 HttpPostedFile file = Request.Files[i];
16                 if (file.ContentLength > 0)
17                 {
18                     if (file.ContentType.Contains("image/"))
19                     {
20                         using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
21                         {
22                             string FileName = System.IO.Path.GetFileName(file.FileName);
23                             string[] SplitFileName = FileName.Split('.');
24                             string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss")+"." + SplitFileName[1];
25                             img.Save(Server.MapPath("/upload/" + AtterFileName));
26 
27                             this.Image1.ImageUrl = "upload/" + AtterFileName;
28                         }
29                     }
30                     else
31                     {
32                         Response.Write("<script>alert('该文件不是图片格式！');</script>");
33                     }
34                 }
35                 else
36                 {
37                     Response.Write("<script>alert('请选择要上传的图片');</script>");
38                 }
39 
40             }
41         }

View Code

第二、添加文字水印的图片上传，代码如下：

 1 xxx.aspx
 2  <td class="style1"> 
 3                 <asp:FileUpload ID="FileUpload2" runat="server" />
 4                 <asp:Button ID="Button2" runat="server" Text="上传文字图片" onclick="Button2_Click" /> 
 5             </td>
 6             <td> 
 7                 <asp:Image ID="Image2" runat="server" Height="200px" Width="200px" /> 
 8             </td>
 9 
10 xxx.aspx.cs
11  protected void Button2_Click(object sender, EventArgs e)
12         {
13             for (int i = 0; i < Request.Files.Count; i++)
14             {
15                 HttpPostedFile file = Request.Files[i];
16                 if (file.ContentLength > 0)
17                 {
18                     if (file.ContentType.Contains("image/"))
19                     {
20                         using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
21                         {
22                             using (Graphics g = Graphics.FromImage(img))
23                             {
24                                 g.DrawString("我的图片", new Font("宋体", 14), Brushes.Red, 0, 0);
25                             }
26                             string FileName = System.IO.Path.GetFileName(file.FileName);
27                             string[] SplitFileName = FileName.Split('.');
28                             string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1];
29                             img.Save(Server.MapPath("/upload/" + AtterFileName));
30                             this.Image2.ImageUrl = "upload/" + AtterFileName;
31                         }
32                     }
33                     else
34                     {
35                         Response.Write("<script>alert('该文件不是图片格式！');</script>");
36                     }
37                 }
38                 else
39                 {
40                     Response.Write("<script>alert('请选择要上传的图片');</script>");
41                 }
42 
43             }
44         }

View Code

第三、添加图片水印的图片上传，代码如下：

 1 xxx.aspx
 2  <td class="style1"> 
 3                 <asp:FileUpload ID="FileUpload3" runat="server" />
 4                 <asp:Button ID="Button3" runat="server" Text="上传水印图片" onclick="Button3_Click" /> 
 5             </td>
 6             <td> 
 7                 <asp:Image ID="Image3" runat="server" Height="200px" Width="200px" /> 
 8             </td>
 9 
10 xxx.aspx.cs
11 protected void Button3_Click(object sender, EventArgs e)
12         {
13             for (int i = 0; i < Request.Files.Count; i++)
14             {
15                 HttpPostedFile file = Request.Files[i];
16                 if (file.ContentLength > 0)
17                 {
18                     if (file.ContentType.Contains("image/"))
19                     {
20                         string fileName = file.FileName;
21                         using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
22                         {
23                             using (System.Drawing.Image imgWater = System.Drawing.Image.FromFile(Server.MapPath("/img/czlogo.jpg")))
24                             {
25                                 using (Graphics g = Graphics.FromImage(img))
26                                 {
27                                     g.DrawImage(imgWater, 0, 0);
28                                 }
29                                 string[] SplitFileName = fileName.Split('.');
30                                 string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1];
31                                 img.Save(Server.MapPath("/upload/" + AtterFileName));
32                                 this.Image3.ImageUrl = "upload/" + AtterFileName;
33                             }
34                         }
35                     }
36                     else
37                     {
38                         Response.Write("<script>alert('该文件不是图片格式！');</script>");
39                     }
40                 }
41                 else
42                 {
43                     Response.Write("<script>alert('请选择要上传的图片');</script>");
44                 }
45             }
46         }

View Code

第四、上传图片浓缩图，代码如下：

 1 xxx.aspx
 2  <td class="style1"> 
 3                 <asp:FileUpload ID="FileUpload4" runat="server" />
 4                 <asp:Button ID="Button4" runat="server" Text="上传浓缩图片" onclick="Button4_Click" /> 
 5             </td>
 6             <td> 
 7                 <asp:Image ID="Image4" runat="server" Height="200px" Width="200px" /> 
 8             </td>
 9 
10 xxx.aspx.cs
11  protected void Button4_Click(object sender, EventArgs e)
12         {
13             for (int i = 0; i < Request.Files.Count; i++)
14             {
15                 HttpPostedFile file = Request.Files[i];
16                 if (file.ContentLength > 0)
17                 {
18                     if (file.ContentType.Contains("image/"))
19                     { 
20                         using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
21                         {
22                             using (System.Drawing.Image imgThumb = new Bitmap(200, 100))
23                             {
24                                 using (Graphics g = Graphics.FromImage(imgThumb))
25                                 {
26                                     g.DrawImage(img, new Rectangle(0, 0, imgThumb.Width, imgThumb.Height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);
27                                 }
28                                 string fileName = file.FileName;
29                                 string[] SplitFileName = fileName.Split('.');
30                                 string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1];
31                                 img.Save(Server.MapPath("/upload/" + AtterFileName));
32                                 this.Image4.ImageUrl = "upload/" + AtterFileName;
33                             }
34                         }
35                     }
36                     else
37                     {
38                         Response.Write("<script>alert('该文件不是图片格式！');</script>");
39                     }
40                 }
41                 else
42                 {
43                     Response.Write("<script>alert('请选择要上传的图片');</script>");
44                 }
45             }
46 
47         }