验证码
1 namespace CZBK.TestProject.Common
2 {
3 public class ValidateCode
4 {
5 public ValidateCode()
6 {
7 }
8 /// <summary>
9 /// 验证码的最大长度
10 /// </summary>
11 public int MaxLength
12 {
13 get { return 10; }
14 }
15 /// <summary>
16 /// 验证码的最小长度
17 /// </summary>
18 public int MinLength
19 {
20 get { return 1; }
21 }
22 /// <summary>
23 /// 生成验证码
24 /// </summary>
25 /// <param name="length">指定验证码的长度</param>
26 /// <returns></returns>
27 public string CreateValidateCode(int length)
28 {
29 int[] randMembers = new int[length];
30 int[] validateNums = new int[length];
31 string validateNumberStr = "";
32 //生成起始序列值
33 int seekSeek = unchecked((int)DateTime.Now.Ticks);
34 Random seekRand = new Random(seekSeek);
35 int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);
36 int[] seeks = new int[length];
37 for (int i = 0; i < length; i++)
38 {
39 beginSeek += 10000;
40 seeks[i] = beginSeek;
41 }
42 //生成随机数字
43 for (int i = 0; i < length; i++)
44 {
45 Random rand = new Random(seeks[i]);
46 int pownum = 1 * (int)Math.Pow(10, length);
47 randMembers[i] = rand.Next(pownum, Int32.MaxValue);
48 }
49 //抽取随机数字
50 for (int i = 0; i < length; i++)
51 {
52 string numStr = randMembers[i].ToString();
53 int numLength = numStr.Length;
54 Random rand = new Random();
55 int numPosition = rand.Next(0, numLength - 1);
56 validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
57 }
58 //生成验证码
59 for (int i = 0; i < length; i++)
60 {
61 validateNumberStr += validateNums[i].ToString();
62 }
63 return validateNumberStr;
64 }
65
66 /// <summary>
67 /// 创建验证码的图片
68 /// </summary>
69 /// <param name="containsPage">要输出到的page对象</param>
70 /// <param name="validateNum">验证码</param>
71 public void CreateValidateGraphic(string validateCode, HttpContext context)
72 {
73 Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22);
74 Graphics g = Graphics.FromImage(image);
75 try
76 {
77 //生成随机生成器
78 Random random = new Random();
79 //清空图片背景色
80 g.Clear(Color.White);
81 //画图片的干扰线
82 for (int i = 0; i < 25; i++)
83 {
84 int x1 = random.Next(image.Width);
85 int x2 = random.Next(image.Width);
86 int y1 = random.Next(image.Height);
87 int y2 = random.Next(image.Height);
88 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
89 }
90 Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
91 LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
92 Color.Blue, Color.DarkRed, 1.2f, true);
93 g.DrawString(validateCode, font, brush, 3, 2);
94 //画图片的前景干扰点
95 for (int i = 0; i < 100; i++)
96 {
97 int x = random.Next(image.Width);
98 int y = random.Next(image.Height);
99 image.SetPixel(x, y, Color.FromArgb(random.Next()));
100 }
101 //画图片的边框线
102 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
103 //保存图片数据
104 MemoryStream stream = new MemoryStream();
105 image.Save(stream, ImageFormat.Jpeg);
106 //输出图片流
107 context.Response.Clear();
108 context.Response.ContentType = "image/jpeg";
109 context.Response.BinaryWrite(stream.ToArray());
110 }
111 finally
112 {
113 g.Dispose();
114 image.Dispose();
115 }
116 }
117 /// <summary>
118 /// 得到验证码图片的长度
119 /// </summary>
120 /// <param name="validateNumLength">验证码的长度</param>
121 /// <returns></returns>
122 public static int GetImageWidth(int validateNumLength)
123 {
124 return (int)(validateNumLength * 12.0);
125 }
126 /// <summary>
127 /// 得到验证码的高度
128 /// </summary>
129 /// <returns></returns>
130 public static double GetImageHeight()
131 {
132 return 22.5;
133 }
134 }
135 }
生成缩略图
public class ImageHelper
{
#region 缩略图
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case "HW": //指定高宽缩放（可能变形）
break;
case "W": //指定宽，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case "H": //指定高，宽按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut": //指定高宽裁减（不变形）
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel);
try
{
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
#endregion
}
水印图
1 public void ProcessRequest(HttpContext context)
2 {
3 //生成水印图
4 context.Response.ContentType = "text/plain";
5 //访问该页面创建一张图片，并且该图片上写字.
6 using (Bitmap map = new Bitmap(300, 400))//创建了一个画布
7 {
8 using (Graphics g = Graphics.FromImage(map))//为画布创建了一个画笔
9 {
10 g.Clear(Color.Azure);
11 g.DrawString("传智播客", new Font("黑体", 14.0f, FontStyle.Bold), Brushes.Red, new PointF(80,90));
12 string fileName = Guid.NewGuid().ToString();
13 map.Save(context.Request.MapPath("/ImagePath/"+fileName+".jpg"),System.Drawing.Imaging.ImageFormat.Jpeg);//保存图片.
14 }
15 }
16 }
文件下载
1 public void ProcessRequest(HttpContext context)
2 {
3 context.Response.ContentType = "text/plain";
4 string encodeFileName = "aaa.txt";
5 context.Response.AddHeader("Content-Disposition", string.Format("attachment;filename=\"{0}\"", encodeFileName));//在响应头中加上Content-Disposition，attachment表示以附件形式下载.
6 context.Response.WriteFile("aaa.txt");
7 }
文件上传
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
HttpPostedFile file=context.Request.Files["fileUp"];//接收文件数据.
if (file == null)
{
context.Response.Write("请选择文件!!");
}
else
{
//判断上传的文件的类型.
string fileName= Path.GetFileName(file.FileName);//获取文件名与扩张名. aa.jpg
string fileExt = Path.GetExtension(fileName);//获取扩展名.
if (fileExt == ".jpg"||fileExt==".gif")
{
string dir = "/ImagePath/"+DateTime.Now.Year+"/"+DateTime.Now.Month+"/"+DateTime.Now.Day+"/";
//创建文件夹.
Directory.CreateDirectory(Path.GetDirectoryName(context.Request.MapPath(dir)));
//需要对上传的文件进行重命名.
string newfileName = Guid.NewGuid().ToString();
string fullDir = dir + newfileName + fileExt;//构建了完整文件路径.
// file.SaveAs(context.Request.MapPath(fullDir));
// file.SaveAs(context.Request.MapPath("/ImagePath/"+fileName));//保存文件
using (Image imge = Image.FromStream(file.InputStream))//根据上传的文件流创建Image
{
using (Bitmap map = new Bitmap(imge.Width,imge.Height))
{
using (Graphics g = Graphics.FromImage(map))
{
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//先将图片画到画布上.
g.DrawImage(imge, new Rectangle(0, 0, imge.Width, imge.Height));
//在右下角添加水印.
g.DrawString("传智播客", new Font("黑体", 14.0f, FontStyle.Bold), Brushes.Red, new PointF(imge.Width-100,imge.Height-30));
map.Save(context.Request.MapPath(fullDir),System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
}
context.Response.Write("<html><head></head><body><img src=‘"+fullDir+"‘/></body></html>");
//最后将上传成功的图片的路径存储到数据库。
}
else
{
context.Response.Write("文件类型错误!!");
}
}
}
时间： 2024-10-05 00:10:05