使用FileUpload控件上传图片并自动生成缩略图、带文字和图片的水印图
1
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="upfile.aspx.cs" Inherits="upfile_upfile" %>
2
3<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4
5<html xmlns="http://www.w3.org/1999/xhtml" >
6<head runat="server">
7 <title>无标题页</title>
8</head>
9<body>
10 <form id="form1" runat="server">
11 <div>
12 <asp:FileUpload ID="FileUpload1" runat="server" />
13 <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" /><br />
14 <asp:Label ID="Label1" runat="server"></asp:Label></div>
15 </form>
16</body>
17</html>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="upfile.aspx.cs" Inherits="upfile_upfile" %>
2
3
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">4
5
<html xmlns="http://www.w3.org/1999/xhtml" >6
<head runat="server">7
<title>无标题页</title>8
</head>9
<body>10
<form id="form1" runat="server">11
<div>12
<asp:FileUpload ID="FileUpload1" runat="server" />13
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" /><br />14
<asp:Label ID="Label1" runat="server"></asp:Label></div>15
</form>16
</body>17
</html> 1using System;
2using System.Data;
3using System.Configuration;
4using System.Collections;
5using System.Web;
6using System.Web.Security;
7using System.Web.UI;
8using System.Web.UI.WebControls;
9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11using System.IO;
12
13public partial class upfile_upfile : System.Web.UI.Page
14{
15
protected void Page_Load(object sender, EventArgs e)
16
{ }
17
18 protected void Button1_Click(object sender, EventArgs e)
19 {
20 if (FileUpload1.HasFile)
21 {
22 string fileContentType = FileUpload1.PostedFile.ContentType;
23 if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
24 {
25 string name = FileUpload1.PostedFile.FileName; // 客户端文件路径
26
27 FileInfo file = new FileInfo(name);
28 string fileName = file.Name; // 文件名称
29 string fileName_s = "s_" + file.Name; // 缩略图文件名称
30 string fileName_sy = "sy_" + file.Name; // 水印图文件名称（文字）
31 string fileName_syp = "syp_" + file.Name; // 水印图文件名称（图片）
32 string webFilePath = Server.MapPath("file/" + fileName); // 服务器端文件路径
33 string webFilePath_s = Server.MapPath("file/" + fileName_s); // 服务器端缩略图路径
34 string webFilePath_sy = Server.MapPath("file/" + fileName_sy); // 服务器端带水印图路径(文字)
35 string webFilePath_syp = Server.MapPath("file/" + fileName_syp); // 服务器端带水印图路径(图片)
36 string webFilePath_sypf = Server.MapPath("file/shuiyin.jpg"); // 服务器端水印图路径(图片)
37
38 if (!File.Exists(webFilePath))
39 {
40 try
41 {
42 FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
43 AddShuiYinWord(webFilePath, webFilePath_sy);
44 AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);
45 MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // 生成缩略图方法
46 Label1.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" +
47 FileUpload1.PostedFile.ContentType + "，文件大小为：" + FileUpload1.PostedFile.ContentLength + "B";
48
}
49 catch (Exception ex)
50 {
51 Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;
52 }
53 }
54 else
55 {
56 Label1.Text = "提示：文件已经存在，请重命名后上传";
57 }
58 }
59 else
60 {
61 Label1.Text = "提示：文件类型不符";
62 }
63 }
64 }
65 /**/
66 /// <summary>
67 /// 生成缩略图
68 /// </summary>
69 /// <param name="originalImagePath">源图路径（物理路径）</param>
70 /// <param name="thumbnailPath">缩略图路径（物理路径）</param>
71 /// <param name="width">缩略图宽度</param>
72 /// <param name="height">缩略图高度</param>
73 /// <param name="mode">生成缩略图的方式</param>
74 public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
75 {
76 System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
77
78 int towidth = width;
79 int toheight = height;
80
81 int x = 0;
82 int y = 0;
83 int ow = originalImage.Width;
84 int oh = originalImage.Height;
85
86 switch (mode)
87 {
88 case "HW"://指定高宽缩放（可能变形）
89 break;
90 case "W"://指定宽，高按比例
91 toheight = originalImage.Height * width / originalImage.Width;
92 break;
93 case "H"://指定高，宽按比例
94 towidth = originalImage.Width * height / originalImage.Height;
95 break;
96 case "Cut"://指定高宽裁减（不变形）
97 if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
98 {
99 oh = originalImage.Height;
100 ow = originalImage.Height * towidth / toheight;
101 y = 0;
102 x = (originalImage.Width - ow) / 2;
103 }
104 else
105 {
106 ow = originalImage.Width;
107 oh = originalImage.Width * height / towidth;
108 x = 0;
109 y = (originalImage.Height - oh) / 2;
110 }
111 break;
112 default:
113 break;
114 }
115
116 //新建一个bmp图片
117 System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
118
119 //新建一个画板
120 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
121
122 //设置高质量插值法
123 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
124
125 //设置高质量,低速度呈现平滑程度
126 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
127
128 //清空画布并以透明背景色填充
129 g.Clear(System.Drawing.Color.Transparent);
130
131 //在指定位置并且按指定大小绘制原图片的指定部分
132 g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
133 new System.Drawing.Rectangle(x, y, ow, oh),
134 System.Drawing.GraphicsUnit.Pixel);
135
136 try
137 {
138 //以jpg格式保存缩略图
139 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
140 }
141 catch (System.Exception e)
142 {
143 throw e;
144 }
145 finally
146 {
147 originalImage.Dispose();
148 bitmap.Dispose();
149 g.Dispose();
150 }
151 }
152
153 /**/
154 /// <summary>
155 /// 在图片上增加文字水印
156 /// </summary>
157 /// <param name="Path">原服务器图片路径</param>
158 /// <param name="Path_sy">生成的带文字水印的图片路径</param>
159 protected void AddShuiYinWord(string Path, string Path_sy)
160 {
161 string addText = "测试水印";
162 System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
163 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
164 g.DrawImage(image, 0, 0, image.Width, image.Height);
165 System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);
166 System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);
167
168 g.DrawString(addText, f, b, 15, 15);
169 g.Dispose();
170
171 image.Save(Path_sy);
172 image.Dispose();
173 }
174
175 /**/
176 /// <summary>
177 /// 在图片上生成图片水印
178 /// </summary>
179 /// <param name="Path">原服务器图片路径</param>
180 /// <param name="Path_syp">生成的带图片水印的图片路径</param>
181 /// <param name="Path_sypf">水印图片路径</param>
182 protected void AddShuiYinPic(string Path, string Path_syp, string Path_sypf)
183 {
184 System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
185 System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
186 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
187 g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
188 g.Dispose();
189
190 image.Save(Path_syp);
191 image.Dispose();
192 }
193
}
194
using System;2
using System.Data;3
using System.Configuration;4
using System.Collections;5
using System.Web;6
using System.Web.Security;7
using System.Web.UI;8
using System.Web.UI.WebControls;9
using System.Web.UI.WebControls.WebParts;10
using System.Web.UI.HtmlControls;11
using System.IO;12
13
public partial class upfile_upfile : System.Web.UI.Page14
{15
protected void Page_Load(object sender, EventArgs e)16
{ }
17
18
protected void Button1_Click(object sender, EventArgs e)19
{20
if (FileUpload1.HasFile)21
{22
string fileContentType = FileUpload1.PostedFile.ContentType;23
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")24
{25
string name = FileUpload1.PostedFile.FileName; // 客户端文件路径26
27
FileInfo file = new FileInfo(name);28
string fileName = file.Name; // 文件名称29
string fileName_s = "s_" + file.Name; // 缩略图文件名称30
string fileName_sy = "sy_" + file.Name; // 水印图文件名称（文字）31
string fileName_syp = "syp_" + file.Name; // 水印图文件名称（图片）32
string webFilePath = Server.MapPath("file/" + fileName); // 服务器端文件路径33
string webFilePath_s = Server.MapPath("file/" + fileName_s); // 服务器端缩略图路径34
string webFilePath_sy = Server.MapPath("file/" + fileName_sy); // 服务器端带水印图路径(文字)35
string webFilePath_syp = Server.MapPath("file/" + fileName_syp); // 服务器端带水印图路径(图片)36
string webFilePath_sypf = Server.MapPath("file/shuiyin.jpg"); // 服务器端水印图路径(图片)37
38
if (!File.Exists(webFilePath))39
{40
try41
{42
FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件43
AddShuiYinWord(webFilePath, webFilePath_sy);44
AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);45
MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // 生成缩略图方法46
Label1.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" +47
FileUpload1.PostedFile.ContentType + "，文件大小为：" + FileUpload1.PostedFile.ContentLength + "B";48
}49
catch (Exception ex)50
{51
Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;52
}53
}54
else55
{56
Label1.Text = "提示：文件已经存在，请重命名后上传";57
}58
}59
else60
{61
Label1.Text = "提示：文件类型不符";62
}63
}64
}65
/**/66
/// <summary>67
/// 生成缩略图68
/// </summary>69
/// <param name="originalImagePath">源图路径（物理路径）</param>70
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>71
/// <param name="width">缩略图宽度</param>72
/// <param name="height">缩略图高度</param>73
/// <param name="mode">生成缩略图的方式</param> 74
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)75
{76
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);77
78
int towidth = width;79
int toheight = height;80
81
int x = 0;82
int y = 0;83
int ow = originalImage.Width;84
int oh = originalImage.Height;85
86
switch (mode)87
{88
case "HW"://指定高宽缩放（可能变形） 89
break;90
case "W"://指定宽，高按比例 91
toheight = originalImage.Height * width / originalImage.Width;92
break;93
case "H"://指定高，宽按比例94
towidth = originalImage.Width * height / originalImage.Height;95
break;96
case "Cut"://指定高宽裁减（不变形） 97
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)98
{99
oh = originalImage.Height;100
ow = originalImage.Height * towidth / toheight;101
y = 0;102
x = (originalImage.Width - ow) / 2;103
}104
else105
{106
ow = originalImage.Width;107
oh = originalImage.Width * height / towidth;108
x = 0;109
y = (originalImage.Height - oh) / 2;110
}111
break;112
default:113
break;114
}115
116
//新建一个bmp图片117
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);118
119
//新建一个画板120
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);121
122
//设置高质量插值法123
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;124
125
//设置高质量,低速度呈现平滑程度126
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;127
128
//清空画布并以透明背景色填充129
g.Clear(System.Drawing.Color.Transparent);130
131
//在指定位置并且按指定大小绘制原图片的指定部分132
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),133
new System.Drawing.Rectangle(x, y, ow, oh),134
System.Drawing.GraphicsUnit.Pixel);135
136
try137
{138
//以jpg格式保存缩略图139
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);140
}141
catch (System.Exception e)142
{143
throw e;144
}145
finally146
{147
originalImage.Dispose();148
bitmap.Dispose();149
g.Dispose();150
}151
}152
153
/**/154
/// <summary>155
/// 在图片上增加文字水印156
/// </summary>157
/// <param name="Path">原服务器图片路径</param>158
/// <param name="Path_sy">生成的带文字水印的图片路径</param>159
protected void AddShuiYinWord(string Path, string Path_sy)160
{161
string addText = "测试水印";162
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);163
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);164
g.DrawImage(image, 0, 0, image.Width, image.Height);165
System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);166
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);167
168
g.DrawString(addText, f, b, 15, 15);169
g.Dispose();170
171
image.Save(Path_sy);172
image.Dispose();173
}174
175
/**/176
/// <summary>177
/// 在图片上生成图片水印178
/// </summary>179
/// <param name="Path">原服务器图片路径</param>180
/// <param name="Path_syp">生成的带图片水印的图片路径</param>181
/// <param name="Path_sypf">水印图片路径</param>182
protected void AddShuiYinPic(string Path, string Path_syp, string Path_sypf)183
{184
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);185
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);186
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);187
g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);188
g.Dispose();189
190
image.Save(Path_syp);191
image.Dispose();192
}193
}194
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