标签：blog 问题 javascrip require 时间 nbu session close roc
1 public class ValidateImageCode:IHttpHandler,System.Web.SessionState.IRequiresSessionState 2 { 3 4 //一般处理程序中使用Session必须实现IRequiresSessionState接口 5 public void ProcessRequest(HttpContext context) 6 { 7 context.Response.ContentType = "text/html"; 8 Common.ValidateCode validatecode = new Common.ValidateCode(); 9 string validateLength=validatecode.CreateValidateCode(5); 10 context.Session["validatecode"] = validateLength; 11 validatecode.CreateValidateGraphic(validateLength,context); 12 } 13 14 public bool IsReusable 15 { 16 get 17 { 18 return false; 19 } 20 } 21 }
1 public void ProcessRequest(HttpContext context) 2 { 3 context.Response.ContentType = "text/plain"; 4 Common.ValidateCode validatecode = new Common.ValidateCode(); 5 string validateLength=validatecode.CreateValidateCode(5); 6 validatecode.CreateValidateGraphic(validateLength,context); 7 }
protected bool CheckValidateCode() { //定一个变量 bool isSucess = false; //校验Session的时候一定校验是否为空，因为S有过期时间,ToString()的时候会报异常 if(Session["validatecode"] != null) { string txtCode = Request.Form["txtVcode"]; string sysCode = Session["validatecode"].ToString(); if(sysCode.Equals(txtCode,StringComparison.InvariantCultureIgnoreCase)) { isSucess = true; //一定要清空，安全问题。如果不清空 暴力破解 不断猜测随机生成用户名和密码 Session["validatecode"] = null; } } return isSucess; }
1 <script src="../Js/jquery-1.7.1.js"></script> 2 <script type ="text/javascript"> 3 $(function () { 4 $("#kanbuqing").click(function () { 5 $("#imgVCode").attr("src","ValidateImageCode.ashx?date=" + new Date().getSeconds()); 6 }); 7 }); 8 </script> 9 10 vcode:<input type="text" name="txtVcode" /><img src="ValidateImageCode.ashx" id="imgVCode" /><a href="javascript:void(0)" id="kanbuqing">看不清?</a><Br />
标签：blog 问题 javascrip require 时间 nbu session close roc
原文地址：http://www.cnblogs.com/ligtcho/p/6564428.html
