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.net生成验证码

程序员文章站 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:

.net生成验证码

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。

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