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C# 验证码
Random2Verify类 , 随机产生纯数字/纯字母/数字加字母2中方式的验证码.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
namespace Image2VerifyLib.com
{
/// <summary>
/// 随机生成验证码数据
/// </summary>
internal sealed class Random2Verify
{
#region 生成随机数字
/// <summary>
/// 生成随机数字
/// </summary>
/// <param name="length">生成长度</param>
public static string Number(int Length)
{
return Number(Length, false);
}
/// <summary>
/// 生成随机数字
/// </summary>
/// <param name="Length">生成长度</param>
/// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
public static string Number(int Length, bool Sleep)
{
if (Sleep) System.Threading.Thread.Sleep(3);
string result = "";
System.Random random = new Random();
for (int i = 0; i < Length; i++)
{
result += random.Next(10).ToString();
}
return result;
}
#endregion
#region 生成随机字母与数字
/// <summary>
/// 生成随机字母与数字
/// </summary>
/// <param name="IntStr">生成长度</param>
public static string Str(int Length)
{
return Str(Length, false);
}
/// <summary>
/// 生成随机字母与数字
/// </summary>
/// <param name="Length">生成长度</param>
/// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
public static string Str(int Length, bool Sleep)
{
if (Sleep) System.Threading.Thread.Sleep(3);
char[] Pattern = new char[] { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘ };
string result = "";
int n = Pattern.Length;
System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));
for (int i = 0; i < Length; i++)
{
int rnd = random.Next(0, n);
result += Pattern[rnd];
}
return result;
}
#endregion
#region 生成随机纯字母随机数
/// <summary>
/// 生成随机纯字母随机数
/// </summary>
/// <param name="IntStr">生成长度</param>
public static string Str_char(int Length)
{
return Str_char(Length, false);
}
/// <summary>
/// 生成随机纯字母随机数
/// </summary>
/// <param name="Length">生成长度</param>
/// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
public static string Str_char(int Length, bool Sleep)
{
if (Sleep) System.Threading.Thread.Sleep(3);
char[] Pattern = new char[] { ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘ };
string result = "";
int n = Pattern.Length;
System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));
for (int i = 0; i < Length; i++)
{
int rnd = random.Next(0, n);
result += Pattern[rnd];
}
return result;
}
#endregion
}
}核心类Image2VerifyTool:
using System;
using System.Security.Cryptography;
using System.Drawing;
using Image2VerifyLib.com;
using System.ComponentModel;
using System.Drawing.Drawing2D;
namespace Image2VerifyLib
{
/// <summary>
/// 验证码生成器
/// </summary>
public sealed class Image2VerifyTool
{
#region 私有字段
private string text = String.Empty;
private Bitmap image = null;
private readonly int letterCount = 4; //验证码位数
private readonly int letterWidth = 16; //单个字体的宽度范围
private readonly int letterHeight = 20; //单个字体的高度范围
private static byte[] randb = new byte[4];
private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();
private readonly Color background_color = Color.White;//背景颜色
private Font[] fonts =
{
new Font(new FontFamily("Times New Roman"),10 +Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),
new Font(new FontFamily("Georgia"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),
new Font(new FontFamily("Arial"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),
new Font(new FontFamily("Comic Sans MS"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),
new Font(new FontFamily("Microsoft YaHei"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),
new Font(new FontFamily("Verdana"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),
new Font(new FontFamily("Tahoma"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold)
};
#endregion
#region 公有属性
/// <summary>
/// 验证码
/// </summary>
public string Text
{
get { return this.text; }
}
/// <summary>
/// 验证码位数
/// </summary>
public int LetterCount
{
get { return this.letterCount; }
}
#endregion
#region 构造函数
/// <summary>
///
/// </summary>
/// <param name="background_color">验证码背景色</param>
/// <param name="letterCount">验证码位数</param>
/// <param name="letterWidth">单个字体的宽度范围</param>
/// <param name="letterHeight">单个字体的高度范围</param>
public Image2VerifyTool(Color background_color, int letterCount = 4, int letterWidth = 16, int letterHeight = 20)
{
this.background_color = background_color;
this.letterCount = letterCount;
this.letterWidth = letterWidth;
this.letterHeight = letterHeight;
}
#endregion
#region 生成验证码
/// <summary>
/// 生成图片验证码
/// </summary>
/// <param name="type">验证码类型</param>
/// <returns></returns>
public Bitmap CreateVerify(Type2Verfy type)
{
switch (type)
{
case Type2Verfy.Number:
this.text = Random2Verify.Number(this.letterCount);
break;
case Type2Verfy.Letter:
this.text = Random2Verify.Str_char(this.letterCount);
break;
case Type2Verfy.Number_Letter:
this.text = Random2Verify.Str(this.letterCount);
break;
default:
this.text = Random2Verify.Str(this.letterCount);
break;
}
this.CreateImage();
return this.image;
}
#endregion
#region 私有方法
/// <summary>
/// 获得下一个随机数
/// </summary>
/// <param name="max">最大值</param>
private static int Next(int max)
{
rand.GetBytes(randb);
int value = BitConverter.ToInt32(randb, 0);
value = value % (max + 1);
if (value < 0) value = -value;
return value;
}
/// <summary>
/// 获得下一个随机数
/// </summary>
/// <param name="min">最小值</param>
/// <param name="max">最大值</param>
private static int Next(int min, int max)
{
int value = Next(max - min) + min;
return value;
}
#endregion
#region 公共方法
/// <summary>
/// 绘制验证码
/// </summary>
private void CreateImage()
{
int int_ImageWidth = this.text.Length * letterWidth;
Bitmap image = new Bitmap(int_ImageWidth, letterHeight);
Graphics g = Graphics.FromImage(image);
g.Clear(this.background_color);
int i = 0;
for (i = 0; i < 3; i++)
{
int x1 = Next(image.Width);
int x2 = Next(image.Width);
int y1 = Next(image.Height);
int y2 = Next(image.Height);
g.DrawLine(new Pen(GetRandomColor(false), this.Pen_Random_Width), x1, y1, x2, y2);
}
int _x = -12, _y = 0;
for (int int_index = 0; int_index < this.text.Length; int_index++)
{
_x += Next(14, 18);
_y = Next(-1, 0);
string str_char = this.text.Substring(int_index, 1);
str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper();
Brush newBrush = new LinearGradientBrush(new Rectangle(_x, _y, image.Width, image.Height), GetRandomColor(true), GetRandomColor(true),1.2f,true);
Point thePos = new Point(_x, _y);
g.DrawString(str_char, fonts[Next(fonts.Length - 1)] , newBrush, thePos);
}
//噪点
for (i = 0; i < 15; i++)
{
int x1 = Next(image.Width - 1);
int y1 = Next(image.Height - 1);
Pen p = new Pen(GetRandomColor(false), Next(1, 2));
g.DrawRectangle(p, x1, y1, 1, 1);
}
image = TwistImage(image, true, Next(1, 3), Next(4, 5));
//g.DrawRectangle(new Pen(this.background_color, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1));
this.image = image;
}
/// <summary>
/// 字体随机颜色
/// </summary>
private Color GetRandomColor( Boolean is_code = true )
{
Random RandomNum_First = new Random(Guid.NewGuid().GetHashCode());
Random RandomNum_Sencond = new Random(Guid.NewGuid().GetHashCode());
int int_Red = RandomNum_First.Next(180);
int int_Green = RandomNum_Sencond.Next(180);
int int_Blue = (int_Red + int_Green > 300) ? 0 : 400 - int_Red - int_Green;
int_Blue = (int_Blue > 255) ? 255 : int_Blue;
if (is_code)
return Color.FromArgb(255, int_Red, int_Green, int_Blue);
else
{
//Random rand = new Random(Guid.NewGuid().GetHashCode());
return Color.FromArgb( Next(120,200) , int_Red, int_Green, int_Blue);
}
}
/// <summary>
/// pen的随机宽度
/// </summary>
private int Pen_Random_Width
{
get
{
//Random rand = new Random(Guid.NewGuid().GetHashCode());
return Next(1, 3);
}
}
/// <summary>
/// 正弦曲线Wave扭曲图片
/// </summary>
/// <param name="srcBmp">图片路径</param>
/// <param name="bXDir">如果扭曲则选择为True</param>
/// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高,一般为3</param>
/// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param>
private Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
double PI = Math.PI*2.0;
Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
Graphics graph = Graphics.FromImage(destBmp);
graph.FillRectangle(new SolidBrush(Color.White), 0, 0, destBmp.Width, destBmp.Height);
graph.Dispose();
double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
for (int i = 0; i < destBmp.Width; i++)
{
for (int j = 0; j < destBmp.Height; j++)
{
double dx = 0;
dx = bXDir ? (PI * (double)j) / dBaseAxisLen : (PI * (double)i) / dBaseAxisLen;
dx += dPhase;
double dy = Math.Sin(dx);
int nOldX = 0, nOldY = 0;
nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
nOldY = bXDir ? j : j + (int)(dy * dMultValue);
Color color = srcBmp.GetPixel(i, j);
if (nOldX >= 0 && nOldX < destBmp.Width
&& nOldY >= 0 && nOldY < destBmp.Height)
{
destBmp.SetPixel(nOldX, nOldY, color);
}
}
}
srcBmp.Dispose();
return destBmp;
}
#endregion
}
/// <summary>
/// 验证码类型的枚举
/// </summary>
public enum Type2Verfy : uint
{
[Description("纯数字")]
Number = 0,
[Description("纯字母")]
Letter = 1,
[Description("数字加字母")]
Number_Letter = 2
}
}测试(winform)
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Image2VerifyLib;
namespace Image2VerifyTest
{
public partial class Form1 : Form
{
private Image2VerifyTool img2Verify = null;
private string verify2code = string.Empty;
public Form1()
{
InitializeComponent();
img2Verify = new Image2VerifyTool(Color.Violet,5,20,25);
verify2code = this.create_img2verify();
}
private string create_img2verify()
{
Bitmap image = img2Verify.CreateVerify(Type2Verfy.Number_Letter);//创建数字字母混合型验证码
this.pictureBox1.Image = image;
return img2Verify.Text.ToLower();
}
private void button1_Click(object sender, EventArgs e)
{
string inter_str = this.textBox1.Text.Trim().ToLower();
if (inter_str.Length == 0)
{
MessageBox.Show("请先填写验证码");
}
else
{
if (inter_str.Length != img2Verify.LetterCount || inter_str != verify2code)
{
MessageBox.Show("验证码错误");
verify2code = this.create_img2verify();
}
else
{
MessageBox.Show("恭喜,通过验证");
}
}
}
private void button2_Click(object sender, EventArgs e)
{
verify2code = this.create_img2verify();
}
}
}new Image2VerifyTool(Color.Violet,5,20,25);构造函数参数解释
第一个 : 验证码背景色
第二个 : 产生几位的验证码(本次5位)
第三个 : 每一位验证码的宽度
第四个 : 每一位验证码的高度
其中 : Bitmap image = Image2VerifyTool.CreateVerify(Type2Verfy.Number_Letter);//创建数字字母混合型验证码得到一个字母与数字混合型的图片
验证码的获取 : Image2VerifyTool.Text
验证码类型参见:
/// <summary>
/// 验证码类型的枚举
/// </summary>
public enum Type2Verfy : uint
{
[Description("纯数字")]
Number = 0,
[Description("纯字母")]
Letter = 1,
[Description("数字加字母")]
Number_Letter = 2
}结果:
本文出自 “Better_Power_Wisdom” 博客，请务必保留此出处http://aonaufly.blog.51cto.com/3554853/1953094
C# 验证码
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