文章目录
前言功能实现一、功能界面二、创建图形验证码类三、创建存储IP地址的数据库表四、创建手机验证码类五、在Form1中调用以上两个类中的函数，实现功能前言
1.发送手机验证码用的是网建的SMS接口（/） 2.手机验证码简单的做了以下限制： ①发送验证码1分钟只能点击发送1次 ②相同IP手机号码1天最多提交20次（这里我用的是本地局域网IP） ③加入图形验证码 注：SMS官网上的建议还有要对手机号码次数进行限制：单个手机号码30分钟最多提交10次。（这个和IP限制次数方法是一样的，我这里没加）
功能实现
一、功能界面
二、创建图形验证码类
关于图形验证码，也可以参照我的这篇文章：C# WinForm 登录界面的图片验证码
创建产生图形验证码的类：
①生成随机验证码字符串，用的是Random随机函数，用GUID生成6位随机数
②创建验证码图片，将该字符串画在PictureBox控件中
ImageVeriCodeClass：
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Drawing;//绘图using System.Windows.Forms;namespace SMSVeriCode{public class ImageVeriCodeClass{#region 图片验证码功能 /// <summary>/// 生成随机验证码字符串/// </summary>public static string CreateRandomImageCode(int CodeLength){int randNum;char code;string randomCode = String.Empty;//随机验证码//生成一定长度的随机验证码 //Random random = new Random();//生成随机数对象for (int i = 0; i < CodeLength; i++){//利用GUID生成6位随机数byte[] buffer = Guid.NewGuid().ToByteArray();//生成字节数组int seed = BitConverter.ToInt32(buffer, 0);//利用BitConvert方法把字节数组转换为整数Random random = new Random(seed);//以生成的整数作为随机种子randNum = random.Next();//randNum = random.Next();if (randNum % 3 == 1){code = (char)('A' + (char)(randNum % 26));//随机大写字母}else if (randNum % 3 == 2){code = (char)('a' + (char)(randNum % 26));//随机小写字母}else{code = (char)('0' + (char)(randNum % 10));//随机数字}randomCode += code.ToString();}return randomCode;}/// <summary>/// 创建验证码图片/// </summary>public static void CreateImage(string strValidCode, PictureBox pbox){try{int RandAngle = 45;//随机转动角度int MapWidth = (int)(strValidCode.Length * 21);Bitmap image = new Bitmap(MapWidth, 28);//验证码图片大小-宽和高//创建绘图对象GraphicsGraphics graph = Graphics.FromImage(image);graph.Clear(Color.AliceBlue);//清除绘画面,填充背景色graph.DrawRectangle(new Pen(Color.Black, 0), 0, 0, image.Width - 1, image.Height - 1);//画一个边框graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//模式Random rand = new Random();//背景噪点生成Pen blackPen = new Pen(Color.LightGray, 0);for (int i = 0; i < 50; i++){int x = rand.Next(0, image.Width);int y = rand.Next(0, image.Height);graph.DrawRectangle(blackPen, x, y, 1, 1);}//验证码旋转，防止机器识别char[] chars = strValidCode.ToCharArray();//拆散字符串成单字符数组//文字居中StringFormat format = new StringFormat(StringFormatFlags.NoClip);format.Alignment = StringAlignment.Center;format.LineAlignment = StringAlignment.Center;//定义颜色Color[] c = {Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };//定义字体string[] font = {"Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };for (int i = 0; i < chars.Length; i++){int cindex = rand.Next(7);int findex = rand.Next(5);Font f = new System.Drawing.Font(font[findex], 13, System.Drawing.FontStyle.Bold);//字体样式(参数2为字体大小)Brush b = new System.Drawing.SolidBrush(c[cindex]);Point dot = new Point(16, 16);float angle = rand.Next(-RandAngle, RandAngle);//转动的度数graph.TranslateTransform(dot.X, dot.Y);//移动光标到指定位置graph.RotateTransform(angle);graph.DrawString(chars[i].ToString(), f, b, 1, 1, format);graph.RotateTransform(-angle);//转回去graph.TranslateTransform(2, -dot.Y);//移动光标到指定位置}pbox.Image = image;}catch (ArgumentException){MessageBox.Show("验证码图片创建错误");}}#endregion}}
三、创建存储IP地址的数据库表
对于IP次数的限制，我是把IP地址存在了数据库的表里。
①先创建一个数据库SMSVeriCode
②创建tIP表的sql语句：
create table tIP(IP nvarchar(32), --IP地址SendTimes int, --发送次数SMSVeriCodeTime datetime2 --手机验证码发送时间)
四、创建手机验证码类
创建发送手机验证码的类：
①发送手机验证码功能
②验证国内手机号
③根据IP地址限制手机号码1天最多提交20次
④获取本地IP地址信息（局域网IP）
SMSVeriCodeClass：
using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;//需要用到的命名空间using System.IO;using ;using System.Text;using System.Windows.Forms;using System.Text.RegularExpressions;using System.Data.SqlClient;using .Sockets;namespace SMSVeriCode{public class SMSVeriCodeClass{#region 手机验证码功能/// <summary>/// 获取随机验证码/// 利用GUID获取随机数/// </summary>/// <param name="Phone">手机号</param>/// <param name="MinSeed">随机数最小值</param>/// <param name="MaxSeed">随机数最大值</param>/// <returns>随机验证码</returns>public static string GetSMSValidCode(int MinSeed, int MaxSeed){byte[] pbyte = Guid.NewGuid().ToByteArray();//生成字节数组int seed = BitConverter.ToInt32(pbyte, 0);//利用BitConvert方法把字节数组转换为整数Random random = new Random(seed);//以生成的整数作为随机种子string smsVeriCode = random.Next(MinSeed, MaxSeed).ToString();return smsVeriCode;}/// <summary>/// 发送验证码的函数/// </summary>/// <param name="Phone"></param>/// <param name="textContent"></param>/// <returns>返回发送的结果：数字</returns>public static string SendSMSVeriCode(string UidName, string KeyMD5, string Phone, string TextContent){string strUrl = "http://utf8./?";//UTF-8编码Urlstring strUidName = "Uid=";//SMS平台的用户名string strKeyMD5 = "&key=";//SMS平台的接口密匙；strKeyMD5=接口密钥32位MD5加密(大写)string strPhone = "&smsMob=";//目的手机号码string strTextContent = "&smsText="; //短信内容；普通短信70个字/条strUrl = strUrl + strUidName + UidName + strKeyMD5 + KeyMD5 + strPhone + Phone + strTextContent + TextContent;string SMSResult = GetFromUrl(strUrl);//发送短信,得到返回值//MessageBox.Show(Result);//string JudgeResult = GetResult(SMSResult);//判断返回值 //return JudgeResult;return SMSResult;}/// <summary>/// 发送短信,得到返回值/// </summary> public static string GetFromUrl(string url){string strReturn = null;if (url == null || url.Trim().ToString() == ""){return strReturn;}else//手机号正确{string targeturl = url.ToString();try{HttpWebRequest hr = (HttpWebRequest)WebRequest.Create(targeturl);hr.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)";hr.Method = "GET";hr.Timeout = 30 * 60 * 1000; //30分钟超时WebResponse hs = hr.GetResponse();Stream sr = hs.GetResponseStream();StreamReader ser = new StreamReader(sr, Encoding.Default);strReturn = ser.ReadToEnd();}catch (Exception ex){strReturn = null;MessageBox.Show(ex.Message);}}return strReturn;}/// <summary>/// 判断返回值 /// </summary>public static string GetResult(string strReturn){int result = 0;try{result = int.Parse(strReturn);switch (result){case -1:strReturn = "没有该用户账户";break;case -2:strReturn = "接口密钥不正确,不是账户登陆密码";break;case -21:strReturn = "MD5接口密钥加密不正确";break;case -3:strReturn = "短信数量不足";break;case -11:strReturn = "该用户被禁用";break;case -14:strReturn = "短信内容出现非法字符";break;case -4:strReturn = "手机号格式不正确";break;case -41:strReturn = "手机号码为空";break;case -42:strReturn = "短信内容为空";break;case -51:strReturn = "短信签名格式不正确,接口签名格式为：【签名内容】";break;case -52:strReturn = "短信签名太长";break;case -6:strReturn = "IP限制";break;default:strReturn = "成功发送" + result + "条短信！";break;}}catch (Exception ex){strReturn = ex.Message;}return strReturn;}#endregion/// <summary>/// 验证国内手机号/// </summary>/// <param name="phone">手机号</param>/// <returns></returns>public static bool CheckMobilePhone(string phone){//电信手机号码正则 string dianxin = @"^1[3578][01379]\d{8}$";Regex dReg = new Regex(dianxin);//联通手机号正则 string liantong = @"^1[34578][01256]\d{8}$";Regex tReg = new Regex(liantong);//移动手机号正则 string yidong = @"^(134[012345678]\d{7}|1[34578][012356789]\d{8})$";Regex yReg = new Regex(yidong);if (dReg.IsMatch(phone) || tReg.IsMatch(phone) || yReg.IsMatch(phone)){return true;}return false;}#region 根据IP限制手机号码1天最多提交20次 /// <summary>/// 发送次数清零/// </summary> public static int ResetSendTimes(string IP){string connString = "server=.;database=SMSVeriCode;uid=test;pwd=test";SqlConnection pSqlConnection = new SqlConnection(connString);pSqlConnection.Open();string sqlReset = "update tIP set SendSMSTimes=0 where IP='" + IP + "'";SqlCommand sqlcmdReset = new SqlCommand(sqlReset, pSqlConnection);return sqlcmdReset.ExecuteNonQuery();}/// <summary>/// 更新已发送的次数/// </summary> public static int UpdateSendTimes(string IP){string connString = "server=.;database=SMSVeriCode;uid=test;pwd=test";SqlConnection pSqlConnection = new SqlConnection(connString);pSqlConnection.Open();string sqlUdpate = "update tIP set SendSMSTimes = SendSMSTimes + 1 where IP='" + IP + "'";SqlCommand sqlcmdUpdate = new SqlCommand(sqlUdpate, pSqlConnection);return sqlcmdUpdate.ExecuteNonQuery();}/// <summary>/// 更新手机验证码发送时间/// </summary>public static int UpdateSMSCodeTime(string IP){string connString = "server=.;database=SMSVeriCode;uid=test;pwd=test";SqlConnection pSqlConnection = new SqlConnection(connString);pSqlConnection.Open();string sqlUpdateTime = "update tIP set SMSVeriCodeTime=getdate() where IP='" + IP + "'";SqlCommand sqlcmdUpdateTime = new SqlCommand(sqlUpdateTime, pSqlConnection);return sqlcmdUpdateTime.ExecuteNonQuery();}#endregion /// <summary>/// 获取本地IP地址信息/// </summary>public static string GetLocalIP(){try{string HostName = Dns.GetHostName();//主机名IPHostEntry ip = Dns.GetHostEntry(HostName);for (int i = 0; i < ip.AddressList.Length; i++){//AddressFamily.InterNetwork表示IPV4//AddressFamily.InterNetworkV6表示IPV6if (ip.AddressList[i].AddressFamily == AddressFamily.InterNetwork){return ip.AddressList[i].ToString();}}return "";}catch (Exception ex){MessageBox.Show("GetLocalIP Error!" + ex.Message);return "";}}}}
五、在Form1中调用以上两个类中的函数，实现功能
注： 以下代码中的"用户名"和"密钥"，要去SMS网站中查看。
string UidName = "XXXXXXX";//SMS平台的用户名string KeyMD5 = "XXXXXXXX";//SMS平台的接口密匙；
IP次数限制的大致思路——相同IP手机号码1天最多提交20次：
①用户发送验证码，获取其IP地址，判断数据表中是否已经有了这个IP;
如果没有就向数据表中插入这个新的IP地址，接着发送验证码，在表中更新发送次数+1；
②如果查询到表中已经有了这个IP地址，就判断其是否满足条件（发送次数<=20，时间<24小时）；
③如果不满足条件,直接返回，不往下继续执行程序；
④如果满足条件,往下执行程序,发送验证码。（同时要注意查询表中的发送次数是否为0，要更新发送时间）
Form1.cs：
using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SMSVeriCode{public partial class Form1 : Form{public Form1(){InitializeComponent();}#region 图片验证码private const int ImageVeriCodeLength = 4;//验证码长度 private String strImageVeriCode = "";//验证码 //更新图片验证码private void UpdateImageVeriCode(){strImageVeriCode = ImageVeriCodeClass.CreateRandomImageCode(ImageVeriCodeLength);//生成随机验证码if (strImageVeriCode == "") return;ImageVeriCodeClass.CreateImage(strImageVeriCode, pbox1);//创建验证码图片}#endregion//窗体加载时更新图片验证码private void Form1_Load(object sender, EventArgs e){UpdateImageVeriCode();}//点击PictureBox更新图片验证码private void pbox1_Click(object sender, EventArgs e){UpdateImageVeriCode();}/// <summary>/// 获取手机验证码/// </summary>int seconds1 = 60;//倒计时60sint seconds2 = 60 * 5;//验证码有效时间5分钟string strSMSVeriCode; private void btnSendVeriCode_Click(object sender, EventArgs e){//获取文本框中的数据string phone = txtPhone.Text.Trim();//手机号string imagevericode = txtImageVeriCode.Text.Trim();//图片验证码strSMSVeriCode = SMSVeriCodeClass.GetSMSValidCode(100000, 999999);//随机6位SMS验证码int totalTime = 5;//SMS验证码有效时长string smsTextContent = "验证码：" + strSMSVeriCode + "，" + totalTime + "分钟内有效,请勿泄漏于他人。如非本人操作，请忽略。";//SMS短信文本内容 string UidName = "XXXXXXX";//SMS平台的用户名string KeyMD5 = "XXXXXXXX";//SMS平台的接口密匙； if (String.IsNullOrEmpty(phone))//判断是否输入了手机号{MessageBox.Show("请输入手机号！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);txtPhone.Focus();}else if (SMSVeriCodeClass.CheckMobilePhone(phone) == false)//判断手机号格式是否正确{MessageBox.Show("请输入有效的11位手机号码", "警告", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);txtPhone.Focus();}else if (String.IsNullOrEmpty(imagevericode))//判断是否输入了图片验证码{MessageBox.Show("请输入图片验证码！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);txtImageVeriCode.Focus();}else if (imagevericode.ToLower() != strImageVeriCode.ToLower())//判断图片验证码输入是否正确；不区分大小写{MessageBox.Show("您输入的验证码有误！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);UpdateImageVeriCode();txtImageVeriCode.Text = "";txtImageVeriCode.Focus();}else//发送SMS验证码{string ip = SMSVeriCodeClass.GetLocalIP();string connString = "server=.;database=SMSVeriCode;uid=test;pwd=test";SqlConnection pSqlConnection = new SqlConnection(connString);pSqlConnection.Open();string sqlIP = "select *,datediff(hour,SMSVeriCodeTime,getdate()) as TimeIntervel from tIP where IP='" + ip + "'";SqlCommand sqlcmdIP = new SqlCommand(sqlIP, pSqlConnection);SqlDataReader sdr = sqlcmdIP.ExecuteReader();sdr.Read();if (sdr.HasRows == true)//表中已有此IP地址{if (sdr.GetInt32(1) == 20 && sdr.GetInt32(3) <= 24)//20次，24小时{MessageBox.Show("相同IP手机号码1天最多提交20次！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);UpdateImageVeriCode();txtImageVeriCode.Text = "";return;} else if (sdr.GetInt32(1) == 20 && sdr.GetInt32(3) > 24){SMSVeriCodeClass.ResetSendTimes(ip);//发送次数置零}if (sdr.GetInt32(1) == 0)//次数为0时{string SMSResult = SMSVeriCodeClass.SendSMSVeriCode(UidName, KeyMD5, phone, smsTextContent);//发送 if (Convert.ToInt32(SMSResult) > 0)//成功发送SMS验证码{//倒计时开始timer1.Interval = 1000;timer1.Start();timer2.Interval = 1000;timer2.Start();btnSendVeriCode.Enabled = false;UpdateImageVeriCode();txtImageVeriCode.Text = "";SMSVeriCodeClass.UpdateSendTimes(ip);//更新发送次数+1SMSVeriCodeClass.UpdateSMSCodeTime(ip);//更新发送时间}else//发送SMS验证码失败{string JudetResult = SMSVeriCodeClass.GetResult(SMSResult);MessageBox.Show(JudetResult, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);}}else{string SMSResult = SMSVeriCodeClass.SendSMSVeriCode(UidName, KeyMD5, phone, smsTextContent);//发送 if (Convert.ToInt32(SMSResult) > 0)//成功发送SMS验证码{//倒计时开始timer1.Interval = 1000;timer1.Start();timer2.Interval = 1000;timer2.Start();btnSendVeriCode.Enabled = false;UpdateImageVeriCode();txtImageVeriCode.Text = "";SMSVeriCodeClass.UpdateSendTimes(ip);//更新发送次数+1 }else//发送SMS验证码失败{string JudetResult = SMSVeriCodeClass.GetResult(SMSResult);MessageBox.Show(JudetResult, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);}}}else//表中没有此IP地址—第一次发送验证码{string smsSendTime = DateTime.Now.ToString();//SMS验证码发送时间//--------向数据表tIP中添加信息------//pSqlConnection.Close();pSqlConnection.Open();string sqlInsert = "insert into tIP(IP,SendSMSTimes,SMSVeriCodeTime)";sqlInsert += "values('{0}','{1}','{2}')";sqlInsert = string.Format(sqlInsert, ip,"0",smsSendTime);SqlCommand sqlcmdInsert = new SqlCommand(sqlInsert, pSqlConnection);sqlcmdInsert.ExecuteNonQuery();//--------------发送验证码----------------//string SMSResult = SMSVeriCodeClass.SendSMSVeriCode(UidName, KeyMD5, phone, smsTextContent);//发送 if (Convert.ToInt32(SMSResult) > 0)//成功发送SMS验证码{//倒计时开始timer1.Interval = 1000;timer1.Start();timer2.Interval = 1000;timer2.Start();btnSendVeriCode.Enabled = false;UpdateImageVeriCode();txtImageVeriCode.Text = "";SMSVeriCodeClass.UpdateSendTimes(ip);//更新发送次数+1 }else//发送SMS验证码失败{string JudetResult = SMSVeriCodeClass.GetResult(SMSResult);MessageBox.Show(JudetResult, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);}}}}/// <summary>/// 倒计时—SMS验证码1分钟只能点击发送1次/// </summary> private void timer1_Tick(object sender, EventArgs e){if (seconds1 > 0){seconds1--;btnSendVeriCode.Text = "剩余" + seconds1.ToString() + "秒";}else{timer1.Stop();btnSendVeriCode.Text = "获取验证码";btnSendVeriCode.Enabled = true;}}/// <summary>/// 手机SMS验证码5分钟内有效；但是如果有新的验证码出现,旧验证码就会失效 /// </summary>private void timer2_Tick(object sender, EventArgs e){if (seconds2 == 0){timer2.Stop();//旧的验证码过期,生成一个新的验证码strSMSVeriCode = SMSVeriCodeClass.GetSMSValidCode(100000, 999999);}}/// <summary>/// 确认按钮/// </summary> private void btnConfirm_Click(object sender, EventArgs e){//获取文本数据string smsvericode = txtSMSVeriCode.Text.Trim();//手机SMS验证码if (String.IsNullOrEmpty(smsvericode)){MessageBox.Show("请输入手机验证码！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);txtSMSVeriCode.Focus();}else if (smsvericode != strSMSVeriCode)//判断手机SMS验证码是否输入正确{MessageBox.Show("您输入的验证码有误！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);txtSMSVeriCode.Focus();}else{MessageBox.Show("验证成功!");}} }}
