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
SpringCloud实战(十一)-更优的分布式配置解决方案(Apollo)
查看>>
PDO中捕获SQL语句中的错误
查看>>
SCP和SFTP相同点和区别
查看>>
SpringCloudAlibaba中使用Sentinel实现熔断降级之熔断策略详解
查看>>
peek和pop的区别
查看>>
Pelemay 项目教程
查看>>
Penetration Testing、Security Testing、Automation Testing
查看>>
Pentaho业务分析平台 SQL注入漏洞复现
查看>>
PentestGPT:一款由ChatGPT驱动的强大渗透测试工具
查看>>
PeopleTools 8.54 first install note
查看>>
PEP 8016 获胜,成为新的 Python 社区治理方案
查看>>
PEP8规范
查看>>
PEPM Cookie 远程代码执行漏洞复现(XVE-2024-16919)
查看>>
Percona Server 5.6 安装TokuDB
查看>>
SpringBoot(十四)整合MyBatis
查看>>
percona-xtrabackup 备份
查看>>