博客
关于我
用C#生成随机中文汉字验证码的基本原理
阅读量:345 次
发布时间:2019-03-04

本文共 4675 字,大约阅读时间需要 15 分钟。

???????????????????

???????????????????????????????????????????????????????????????????????????????????????????????????????

1980??????????????????????GB2312-80?????????????????????GB18030-2000????????????????????????GB2312-1980?GB13000-1993?????????????????????????????GB18030?????Windows?????????????????????????????GB2312?????????????????????????????????????????????GB2312?????????????????????????????????????????????????????

??????????????????????????????????????????????????GB2312???????????????????ba c3???ba?????c3?????????????????????15??AF??????????????????????16??B0???????GB2312?????????

?.NET??????????????System.Text??????Encoding???????????????????????????????Encoding.GetBytes()????????????????Encoding.GetString()??????????????????????GB2312?????????????????????

using System;using System.Text;namespace ConsoleApplication{    class ChineseCode    {        public static object[] CreateRegionCode(int strlength)        {            string[] rBase = new string[16];            Random rnd = new Random((DateTime.Now.Ticks) + i);                        object[] bytes = new object[strlength];                        for (int i = 0; i < strlength; i++)            {                int r1 = rnd.Next(11, 14);                string str_r1 = rBase[r1].Trim();                int r2 = rnd.Next(0, 7);                if (r1 == 13)                {                    r2 = rnd.Next(0, 16);                }                else if (r1 == 15)                {                    r2 = rnd.Next(0, 16);                }                else                {                    r2 = rnd.Next(0, 16);                }                string str_r2 = rBase[r2].Trim();                                byte byte1 = Convert.ToByte(str_r1 + str_r2, 16);                byte byte2 = Convert.ToByte(str_r3 + str_r4, 16);                                byte[] str_r = new byte[] { byte1, byte2 };                bytes.SetValue(str_r, i);            }            return bytes;        }                public static void Main()        {            Encoding gb = Encoding.GetEncoding("gb2312");            object[] bytes = CreateRegionCode(4);                        string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[])));            string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[])));            string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[])));            string str4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[])));                        Console.WriteLine(str1 + str2 + str3 + str4);        }    }}

??????????????????????????????GetString()???????????????????????????????????????????

?????????C#????????

using System;using System.Text;namespace ConsoleApplication{    class ChineseCode    {        public static object[] CreateRegionCode(int strlength)        {            string[] rBase = new string[16];            Random rnd = new Random((DateTime.Now.Ticks) + i);                        object[] bytes = new object[strlength];                        for (int i = 0; i < strlength; i++)            {                int r1 = rnd.Next(11, 14);                string str_r1 = rBase[r1].Trim();                int r2 = rnd.Next(0, 7);                if (r1 == 13)                {                    r2 = rnd.Next(0, 16);                }                else if (r1 == 15)                {                    r2 = rnd.Next(0, 16);                }                else                {                    r2 = rnd.Next(0, 16);                }                string str_r2 = rBase[r2].Trim();                                byte byte1 = Convert.ToByte(str_r1 + str_r2, 16);                byte byte2 = Convert.ToByte(str_r3 + str_r4, 16);                                byte[] str_r = new byte[] { byte1, byte2 };                bytes.SetValue(str_r, i);            }            return bytes;        }                public static void Main()        {            Encoding gb = Encoding.GetEncoding("gb2312");            object[] bytes = CreateRegionCode(4);                        string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[])));            string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[])));            string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[])));            string str4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[])));                        Console.WriteLine(str1 + str2 + str3 + str4);        }    }}

????????????????????????????????????????????????GB2312?????????????????????????B?C?D???????????????????

????????????????????????????????????????????????

转载地址:http://wfje.baihongyu.com/

你可能感兴趣的文章
SpringBoot中重写addCorsMapping解决跨域以及提示list them explicitly or consider using “allowedOriginPatterns“ in
查看>>
pageHelper分页工具的使用
查看>>
PageHelper:上手教程(最详细)
查看>>
PageOffice如何实现从零开始动态生成图文并茂的Word文档
查看>>
PageRank算法
查看>>
Paint类(画笔)
查看>>
Palo Alto Networks Expedition 未授权SQL注入漏洞复现(CVE-2024-9465)
查看>>
Palo Alto Networks PAN-OS身份认证绕过导致RCE漏洞复现(CVE-2024-0012)
查看>>
Panalog 日志审计系统 libres_syn_delete.php 前台RCE漏洞复现
查看>>
Panalog 日志审计系统 sprog_deletevent.php SQL 注入漏洞复现
查看>>
pandas :将时间戳转换为 datetime.date
查看>>
pandas :将行取消堆叠到新列中
查看>>
pandas DataFrame 中的自定义浮点格式
查看>>
Pandas Plots:周末的单独颜色,x 轴上漂亮的打印时间
查看>>
Pandas 对数据框的布尔比较
查看>>
Pandas 读取具有浮点值的 csv 文件会导致奇怪的舍入和小数位数
查看>>
pandas 适用,但仅适用于满足条件的行
查看>>
Pandas-通过对列和索引的值求和来合并两个数据框
查看>>
pandas.read_csv()的详解-ChatGPT4o作答
查看>>
PANDAS.READ_EXCEL()输出‘;溢出错误:日期值超出范围‘;而不存在日期列
查看>>