三网合一网站建设全包费用,制作网页用的最多的图像文件格式,十大黄金软件app免费,网络售后服务这周末也没干啥#xff0c;真正开始ASP#xff0c;做了个学籍管理系统的登录界面#xff0c;登录界面主要包括用户名、密码、验证码#xff0c;界面字体用了font size5 colorblue font-family:华文琥珀;/font改变字体…这周末也没干啥真正开始ASP做了个学籍管理系统的登录界面登录界面主要包括用户名、密码、验证码界面字体用了font size5 colorblue font-family:华文琥珀;/font改变字体生成验证码控件 ImageButton 例如asp:ImageButton IDImageButton1 runatserver / 还学会了图片按钮 HyperLink 例如 asp:HyperLink IDHyperLink1 runatserver Textlink to Default NavigateUrl~/Default.aspx ImageUrl~/Image/1.gif/asp:HyperLink其中我觉得很难的就是验证码的生成你首先在站点中添加pivture.aspx 的窗体打开代码页面(即pivture.aspx.cs)并录入下面代码完整的Code using System;using System.Collections;using System.Configuration;using System.Data;using System.Linq;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Xml.Linq;using System.Drawing;using System.IO; public partial class Picture : System.Web.UI.Page{ Random ran new Random(); protected void Page_Load(object sender, EventArgs e) { string str getRandomValidate(4); Session[CheckCode] str;//这一部是Wie了验证码写入Session,进行验证也可以使用cookie getImageValidate(str); } //得到随机字符串长度自定义 private string getRandomValidate(int len) { int num; int tem; string rtuStr; for (int i 0; i len;i ) { num ran.Next(); tem num % 10 0;//生成数字 //tem num % 26 A;//生成字符 rtuStr Convert.ToChar(tem).ToString(); } return rtuStr; } //生成图像 private void getImageValidate(string strValue) { //string stroo00;前两个为字母o后两个数为0 int width Convert.ToInt32(strValue.Length*12); Bitmap img new Bitmap(width,23); Graphics gfc Graphics.FromImage(img); gfc.Clear(Color.White); drawLine(gfc,img); //写验证码要定义Font Font font new Font(arial,12,FontStyle.Bold); //Font font new Font(宋体,12,FontStyle.Bold|FontStyle.Italic); System.Drawing.Drawing2D.LinearGradientBrush brush new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0,0,img.Width,img.Height),Color.DarkOrchid,Color.Blue,1.5f,true); gfc.DrawString(strValue,font, brush ,3,2); drawPoint(img); gfc.DrawRectangle(new Pen(Color.DarkBlue),0,0,img.Width-1,img.Height-1); //将图像添加到页面 MemoryStream ms new MemoryStream(); img.Save(ms,System.Drawing.Imaging.ImageFormat.Gif); //更改HTTP Response.ClearContent(); Response.ContentType image/gif; Response.BinaryWrite(ms.ToArray()); //Dispose gfc.Dispose(); img.Dispose(); Response.End(); } private void drawLine(Graphics gfc,Bitmap img) { //选择画10条线也可以增加也可以不要线只要随机杂点就行 for (int i 0; i 10;i ) { int x1 ran.Next(img.Width); int y1 ran.Next(img.Height); int x2 ran.Next(img.Width); int y2 ran.Next(img.Height); gfc.DrawLine(new Pen(Color.Silver),x1,y1,x2,y2);//注意画笔要淡不然看不清 } } //private void drawPoint(Bitmap img) //{ //} private void drawPoint(Bitmap img) { int col ran.Next();//在一次的图片中杂点颜色相同 for (int i 0; i 100; i) { int x ran.Next(img.Width); int y ran.Next(img.Height); img.SetPixel(x,y,Color.FromArgb(col)); } } }录完后需要在 登录界面显示验证码则需要在登录界面的代码文件 Page_Load 中加入 ImageButton1.ImageUrl ~/Picture.aspx;其登陆页面的代码Default.aspx.cs中的代码为Codeusing System;using System.Configuration;using System.Data;using System.Linq;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Xml.Linq;public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { ImageButton1.ImageUrl ~/Picture.aspx; if (Session[CheckCode] null) Information.Text 对不起验证码生成错误; } protected void OK_Click(object sender, EventArgs e) { if (UserName.Text.Length 0) Information.Text 请输入用户名; else { if(Password.Text.Length 0) Information.Text 请输入密码; else if (CheckCode.Text.ToString() ! Session[CheckCode].ToString()) { Information.Text 对不起验证码不正确请重新输入; } else if (UserName.Text Admin Password.Text Admin CheckCode.Text.ToString() Session[CheckCode].ToString()) { Information.Text 用户 UserName.Text 登录成功; Response.Redirect(~/Default2.aspx); } else Information.Text 用户不存在或密码不正确; } } protected void Cancel_Click(object sender, EventArgs e) { Information.Text 已退出登录 ; }}转载于:https://www.cnblogs.com/yoyiorlee/archive/2009/09/20/1570631.html
