.net生成验证码
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2023-12-21 22:32:22
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:
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:
<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。