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本文为大家分享了.net生成验证码所有代码，大家可以动手操作一下，会有意想不到的收获。
先给大家看看效果图：
页面代码：
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<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>验证码</title>
<script type="text/javascript">
//换一张
function change() {
var img = document.getelementbyid("validatecode");
img.src = img.src + '?';
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<th>
验证码
</th>
<td>
<asp:textbox runat="server" id="tbcheckcode" cssclass="small" maxlength="4"></asp:textbox>
</td>
<td>
<img src="verifycode.aspx" id="validatecode" alt="换一张" onclick="javascript:change()" />
</td>
<td>
<a id="changecode" href="#" onclick="javascript:change()">换一张</a>
</td>
</tr>
<tr>
<td>
<asp:button runat="server" id="loginsubmit" onclick="loginsubmits" text="登录" />
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
后台代码:
/// <summary>
/// 登录
/// </summary>
/// <param name="sender"></param>
protected void loginsubmits(object sender, eventargs e)
{
checklogin();
}
#region 私有方法
#region
public static boolean isnotnull(object str)
{
return !isnull(str);
}
public static boolean isnull(object str)
{
return str == null;
}
public static void show(system.web.ui.page page, string msg)
{
page.clientscript.registerstartupscript(page.gettype(), "message",
"<script language='javascript' defer>alert('" + msg.tostring() + "');</script>");
}
#endregion
private void checklogin()
{
if (tbcheckcode.text.trim() == "")
{
show(this, "验证码不能为空!");
return;
}
else
{
if (isnotnull(session["validatecheckcode"]))
{
if (tbcheckcode.text.trim() != session["validatecheckcode"].tostring())
{
show(this, "验证码填写不正确!");
tbcheckcode.text = "";
return;
}
}
else
{
show(this, "请刷新验证码！");
return;
}
}
}
#endregion
}
}
生成验证码:
using system;
using system.drawing;
using system.text;
using system.web;
namespace web.text
{
public partial class verifycode : system.web.ui.page
{
public encoding gb = encoding.getencoding("gb2312");
protected void page_load(object sender, eventargs e)
{
verifycode v = new verifycode();
v.length = this.length;
v.fontsize = this.fontsize;
v.chaos = this.chaos;
v.backgroundcolor = this.backgroundcolor;
v.chaoscolor = this.chaoscolor;
v.codeserial = this.codeserial;
v.colors = this.colors;
v.fonts = this.fonts;
v.padding = this.padding;
string code = v.createverifycode(); //取随机码
v.createimageonpage(code, this.context); // 输出图片
response.cookies.add(new httpcookie("checkcode", code.toupper())); // 使用cookies取验证码的值
system.web.httpcontext.current.session["validatecheckcode"] = code;
//return checkcode;
}
#region 验证码长度(默认4个验证码的长度)
private int length = 4;
public int length
{
get { return length; }
set { length = value; }
}
#endregion
#region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)
private int fontsize = 12;
public int fontsize
{
get { return fontsize; }
set { fontsize = value; }
}
#endregion
#region 边框补(默认1像素)
private int padding = 1;
public int padding
{
get { return padding; }
set { padding = value; }
}
#endregion
#region 是否输出燥点(默认不输出)
private bool chaos = true;
public bool chaos
{
get { return chaos; }
set { chaos = value; }
}
#endregion
#region 输出燥点的颜色(默认灰色)
private color chaoscolor = color.lightgray;
public color chaoscolor
{
get { return chaoscolor; }
set { chaoscolor = value; }
}
#endregion
#region 自定义背景色(默认白色)
private color backgroundcolor = color.white;
public color backgroundcolor
{
get { return backgroundcolor; }
set { backgroundcolor = value; }
}
#endregion
#region 自定义随机颜色数组
private color[] colors =
{
color.black, color.red, color.darkblue, color.green, color.orange, color.brown,
color.darkcyan, color.purple
};
public color[] colors
{
get { return colors; }
set { colors = value; }
}
#endregion
#region 自定义字体数组
private string[] fonts = {"arial", "georgia"};
public string[] fonts
{
get { return fonts; }
set { fonts = value; }
}
#endregion
#region 自定义随机码字符串序列(使用逗号分隔)
private string codeserial = "0,1,2,3,4,5,6,7,8,9";
// string codeserial = "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,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 codeserial = "殃,央,鸯,秧,杨,扬,佯,疡,羊,洋,阳,氧,仰,痒,养,样,漾,邀,腰,妖,瑶,摇,尧,遥,窑,谣,姚,咬,舀,药,要,耀,椰,噎,耶,爷,野,冶,也,页,掖,业,叶,曳,腋,夜,液,一,壹,医,揖,铱,依,伊,衣,颐,夷,遗,移,仪,胰,疑,沂,宜,姨,彝,椅,蚁,倚,已,乙,矣,以,艺,抑,易,邑,屹,亿,役,臆,逸,肄,疫,亦,裔,意,毅,忆,义,益,溢,诣,议,谊,译,异,翼,翌,绎,茵,荫,因,殷,音,阴,姻,吟,银,淫,寅,饮,尹,引,隐,印,英,樱,婴,鹰,应,缨,莹,萤,营,荧,蝇,迎,赢,盈,影,颖,硬,映,哟,拥,佣,臃,痈,庸,雍,踊,蛹,咏,泳,涌,永,恿,勇,用,幽,优,悠,忧,尤,由,邮,铀,犹,油,游,酉,有,友,右,佑,釉,诱,又,幼,迂,淤,于,盂,榆,虞,愚,舆,余,俞,逾,鱼,愉,渝,渔,隅,予,娱,雨,与,屿,禹,株,蛛,朱,猪,诸,诛,逐,竹,烛,煮,拄,瞩,嘱,主,著,柱,助,蛀,贮,铸,筑,住,注,祝,驻,抓,爪,拽,专,砖,转,撰,赚,篆,桩,庄,装,妆,撞,壮,状,椎,锥,追,赘,坠,缀,谆,准,捉,拙,卓,桌,琢,茁,酌,啄,着,灼,浊,兹,咨,资,姿,滋,淄,孜,紫,仔,籽,滓,子,自,渍,字,鬃,棕,踪,宗,综,总,纵,邹,走,奏,揍,租,足,卒,族,祖,诅,阻,组,钻,纂,嘴,醉,最,罪,尊,遵,昨,左,佐,柞,做,作,坐,座";
public string codeserial
{
get { return codeserial; }
set { codeserial = value; }
}
#endregion
//产生波形滤镜效果
#region 产生波形滤镜效果
private const double pi = 3.1415926535897932384626433832795;
private const double pi2 = 6.283185307179586476925286766559;
/**/
/// <summary>
/// 正弦曲线wave扭曲图片（edit by 51aspx.com）
/// </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>
/// <returns></returns>
public system.drawing.bitmap twistimage(bitmap srcbmp, bool bxdir, double dmultvalue, double dphase)
{
system.drawing.bitmap destbmp = new bitmap(srcbmp.width, srcbmp.height);
// 将位图背景填充为白色
system.drawing.graphics graph = system.drawing.graphics.fromimage(destbmp);
graph.fillrectangle(new solidbrush(system.drawing.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 ? (pi2*(double) j)/dbaseaxislen : (pi2*(double) i)/dbaseaxislen;
dx += dphase;
double dy = math.sin(dx);
// 取得当前点的颜色
int noldx = 0, noldy = 0;
noldx = bxdir ? i + (int) (dy*dmultvalue) : i;
noldy = bxdir ? j : j + (int) (dy*dmultvalue);
system.drawing.color color = srcbmp.getpixel(i, j);
if (noldx >= 0 && noldx < destbmp.width
&& noldy >= 0 && noldy < destbmp.height)
{
destbmp.setpixel(noldx, noldy, color);
}
}
}
return destbmp;
}
#endregion
#region 生成校验码图片
public bitmap createimagecode(string code)
{
int fsize = fontsize;
int fwidth = fsize + padding;
int imagewidth = (int) (code.length*fwidth) + 4 + padding*2;
int imageheight = fsize*2 + padding;
system.drawing.bitmap image = new system.drawing.bitmap(imagewidth, imageheight);
graphics g = graphics.fromimage(image);
g.clear(backgroundcolor);
random rand = new random();
//给背景添加随机生成的燥点
if (this.chaos)
{
pen pen = new pen(chaoscolor, 0);
int c = length*10;
for (int i = 0; i < c; i++)
{
int x = rand.next(image.width);
int y = rand.next(image.height);
g.drawrectangle(pen, x, y, 1, 1);
}
}
int left = 0, top = 0, top1 = 1, top2 = 1;
int n1 = (imageheight - fontsize - padding*2);
int n2 = n1/4;
top1 = n2;
top2 = n2*2;
font f;
brush b;
int cindex, findex;
#region 随机字体和颜色的验证码字符
for (int i = 0; i < code.length; i++)
{
cindex = rand.next(colors.length - 1);
findex = rand.next(fonts.length - 1);
f = new system.drawing.font(fonts[findex], fsize, system.drawing.fontstyle.bold);
b = new system.drawing.solidbrush(colors[cindex]);
if (i%2 == 1)
{
top = top2;
}
else
{
top = top1;
}
left = i*fwidth;
g.drawstring(code.substring(i, 1), f, b, left, top);
}
//画一个边框 边框颜色为color.gainsboro
g.drawrectangle(new pen(color.gainsboro, 0), 0, 0, image.width - 1, image.height - 1);
g.dispose();
//产生波形
//image = twistimage(image, true, 8, 4);
return image;
}
#endregion
//将创建好的图片输出到页面
public void createimageonpage(string code, httpcontext context)
{
system.io.memorystream ms = new system.io.memorystream();
bitmap image = this.createimagecode(code);
image.save(ms, system.drawing.imaging.imageformat.jpeg);
context.response.clearcontent();
context.response.contenttype = "image/jpeg";
context.response.binarywrite(ms.getbuffer());
ms.close();
ms = null;
image.dispose();
image = null;
}
#endregion
#region 生成随机字符码
public string createverifycode(int codelen)
{
if (codelen == 0)
{
codelen = length;
}
string[] arr = codeserial.split(',');
string code = "";
int randvalue = -1;
random rand = new random(unchecked((int) datetime.now.ticks));
for (int i = 0; i < codelen; i++)
{
randvalue = rand.next(0, arr.length - 1);
code += arr[randvalue];
}
return code;
}
public string createverifycode()
{
return createverifycode(0);
}
#endregion
}
}
是不是很有成就感，为大家分享的代码很完整，大家可以在这个基础进行扩展，希望大家喜欢。
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