num.jsp

这是一个基于jsp的实现校验码功能的源码

<%@ page contentType="text/html; charset=GBK" language="java" import="java.sql.*" errorPage="" pageEncoding="GBK"%>
<%
//set Chinese Char 
//Cody by [e-mail];
//homepage:jiarry.126.com
request.setCharacterEncoding("GBK");
response.setCharacterEncoding("GBK");
response.setContentType("text/html; charset=GBK");
%>
<%
String num=request.getParameter("num");
String random=(String)session.getAttribute("random");

if(num!=null&&random!=null)
{
 if(!num.equals(random))
 {
 /*
  out.println("<script>alert('验证码错误！请重试。')</script>");
  out.println("<script>history.go(-1)</script>");
  //response.sendRedirect("img.jsp");
  */
  out.print("validate_failed:"+random);
 }
 else
  {
   //out.println("<center>验证成功！</center>");
  out.print("validate_successful:"+random);
  }
}
%>