login.aspx.cs

基于JSP+SQL Sever2000+Tomcat的网络服务器体系结构开发技术和对数据库技术的进一步了解以及对政府网站的调查研究

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {   
            Random validateN = new Random();
            this.Label1.Text = validateN.Next(9).ToString() + validateN.Next(9).ToString() + validateN.Next(9).ToString() + validateN.Next(9).ToString();
        }
    }
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        string username = Request["username"];
        string userpwd = Request["userpwd"];
        stockClass sc=new stockClass();
        if (sc.validate(username))
        {
            Response.Write("<script>alert('用户名中不能含有非法字符');history.back()</script>");
            return;
        }
        if(sc.validate(userpwd))
        {
            Response.Write("<script>alert('密码中不能含有非法字符');history.back()</script>");
            return;
        }
        if (this.ValidateNumber.Text != this.Label1.Text)
        {
            Response.Write("<script>alert('验证码错误');history.back()</script>");
            return;
        }
        SqlConnection strcon = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["strcon"]);
        strcon.Open();
        SqlCommand scd = new SqlCommand("select count(*) as ff from tb_user where username='"+username+"' and userpwd='"+userpwd+"'",strcon);
        int count = Convert.ToInt32(scd.ExecuteScalar());
        if (count > 0)
        {
            Session["username"] = username;
            Response.Redirect("default.aspx");
        }
        else
        {
            Response.Write("<script>alert('用户名或者密码错误，请重新输入！');history.back()</script>");
            return;
        }
    }
}