前台:
<HTML>
<HEAD>
<title>WebForm3</title>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<INPUT id="loadFile" type="file" runat="server">
<asp:Button id="Button1" runat="server" Text="Button"></asp:Button><BR>
<asp:Image id="Image1" runat="server"></asp:Image></form>
</body>
</HTML>
后台CS代码:
其实把版权信息改成水印的也很简单,只需要修改AddInfo方法即可
<HTML> <HEAD> <title>WebForm3</title> </HEAD> <body> <form id="Form1" method="post" runat="server"> <INPUT id="loadFile" type="file" runat="server"> <asp:Button id="Button1" runat="server" Text="Button"></asp:Button><BR> <asp:Image id="Image1" runat="server"></asp:Image></form> </body></HTML>后台CS代码:
1
/// <summary>
2
/// 生成缩略图
3 /// </summary>
4 /// <param name="fileName">原文件</param>
5 /// <param name="width">宽度</param>
6
/// <param name="height">高度</param>
7 private void CreateThumbnailImage( string fileName,string smallPath,int width,int height )
8 {
9 //版权信息
10 string strAdd = "www.wander.com";
11 //生成的缩略图的名字=年月日+文件大小(防止文件名相同)
12 string newFileName = smallPath;
13
14 System.Drawing.Image image,newImage;
15 //载入原图像
16 image = System.Drawing.Image.FromFile( Server.MapPath( fileName ) );
17 //回调
18 System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort( callBack );
19 //生成缩略图
20 newImage = image.GetThumbnailImage( width,height,callb,new System.IntPtr() );
21
22 AddInfo( newImage,strAdd,newFileName,16 );
23
24 image.Dispose();
25 newImage.Dispose();
26
27 Image1.ImageUrl = newFileName;
28 }
29
30 /// <summary>
31 /// 添加版权信息
32 /// </summary>
33 /// <param name="image"></param>
34 /// <param name="strAdd"></param>
35 /// <param name="newFileName"></param>
36 /// <param name="fontSize"></param>
37 private void AddInfo( System.Drawing.Image image,string strAdd,string newFileName,int fontSize )
38 {
39 Response.Clear();
40 Bitmap b = new Bitmap( image );
41 Graphics g = Graphics.FromImage( b );
42 g.DrawString( strAdd,new Font( "宋体",fontSize ),new SolidBrush( Color.Red ),image.Width/2-80 ,image.Height-30 );
43 b.Save( Server.MapPath( newFileName ),System.Drawing.Imaging.ImageFormat.Gif );
44 }
45
46 private bool callBack()
47 {
48 return true;
49 }
50
51 private void Button1_Click(object sender, System.EventArgs e)
52 {
53 if( loadFile.PostedFile != null )
54
{
55 //判断是不是图像文件
56 if( loadFile.PostedFile.ContentType.ToLower().IndexOf( "image" ) < 0 )
57 {
58 //文件类型错误
59
}
60 else
61 {
62 string ext = loadFile.PostedFile.FileName.Substring( loadFile.PostedFile.FileName.LastIndexOf( "." ) );
63 //生成新的原文件名 年月日+文件大小+扩展名
64 string path = "Uploads\\" + System.DateTime.Now.Date.ToShortDateString() + loadFile.PostedFile.ContentLength.ToString() + ext ;
65 //加上版权信息的文件
66 string newPath = "Uploads\\" + System.DateTime.Now.Date.ToShortDateString() + loadFile.PostedFile.ContentLength.ToString() + "new" + ext ;
67 //缩略图文件名
68 string newFileName = "uploads\\" + System.DateTime.Now.Date.ToShortDateString() + loadFile.PostedFile.ContentLength.ToString() + "small.gif";
69 //上传原图
70 loadFile.PostedFile.SaveAs( Server.MapPath( path ) );
71 //生成缩略图
72 CreateThumbnailImage( path,newFileName,200,300 );
73
74 //给原图加上版权信息
75 System.Drawing.Image image = System.Drawing.Image.FromFile( Server.MapPath( path ) );
76 AddInfo( image,"www.wander.com",newPath,20 );
77 image.Dispose();
78 }
79 }
80 }
/// <summary>
2
/// 生成缩略图3
/// </summary>4
/// <param name="fileName">原文件</param>5
/// <param name="width">宽度</param>6
/// <param name="height">高度</param>7
private void CreateThumbnailImage( string fileName,string smallPath,int width,int height )8
{ 
9
//版权信息10
string strAdd = "www.wander.com";11
//生成的缩略图的名字=年月日+文件大小(防止文件名相同)12
string newFileName = smallPath;13
14
System.Drawing.Image image,newImage;15
//载入原图像16
image = System.Drawing.Image.FromFile( Server.MapPath( fileName ) );17
//回调18
System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort( callBack );19
//生成缩略图20
newImage = image.GetThumbnailImage( width,height,callb,new System.IntPtr() );21
22
AddInfo( newImage,strAdd,newFileName,16 );23
24
image.Dispose();25
newImage.Dispose();26
27
Image1.ImageUrl = newFileName;28
}29
30
/// <summary>31
/// 添加版权信息32
/// </summary>33
/// <param name="image"></param>34
/// <param name="strAdd"></param>35
/// <param name="newFileName"></param>36
/// <param name="fontSize"></param>37
private void AddInfo( System.Drawing.Image image,string strAdd,string newFileName,int fontSize )38
{39
Response.Clear();40
Bitmap b = new Bitmap( image );41
Graphics g = Graphics.FromImage( b );42
g.DrawString( strAdd,new Font( "宋体",fontSize ),new SolidBrush( Color.Red ),image.Width/2-80 ,image.Height-30 );43
b.Save( Server.MapPath( newFileName ),System.Drawing.Imaging.ImageFormat.Gif );44
}45
46
private bool callBack()47
{48
return true;49
}50
51
private void Button1_Click(object sender, System.EventArgs e)52
{53
if( loadFile.PostedFile != null )54
{
55
//判断是不是图像文件56
if( loadFile.PostedFile.ContentType.ToLower().IndexOf( "image" ) < 0 )57
{58
//文件类型错误59
}60
else61
{ 62
string ext = loadFile.PostedFile.FileName.Substring( loadFile.PostedFile.FileName.LastIndexOf( "." ) );63
//生成新的原文件名 年月日+文件大小+扩展名64
string path = "Uploads\\" + System.DateTime.Now.Date.ToShortDateString() + loadFile.PostedFile.ContentLength.ToString() + ext ;65
//加上版权信息的文件66
string newPath = "Uploads\\" + System.DateTime.Now.Date.ToShortDateString() + loadFile.PostedFile.ContentLength.ToString() + "new" + ext ;67
//缩略图文件名68
string newFileName = "uploads\\" + System.DateTime.Now.Date.ToShortDateString() + loadFile.PostedFile.ContentLength.ToString() + "small.gif";69
//上传原图70
loadFile.PostedFile.SaveAs( Server.MapPath( path ) );71
//生成缩略图72
CreateThumbnailImage( path,newFileName,200,300 );73
74
//给原图加上版权信息75
System.Drawing.Image image = System.Drawing.Image.FromFile( Server.MapPath( path ) );76
AddInfo( image,"www.wander.com",newPath,20 );77
image.Dispose();78
}79
}80
}其实把版权信息改成水印的也很简单,只需要修改AddInfo方法即可
