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
Objective-C实现不重复字符的最长子串算法(附完整源码)
查看>>
Objective-C实现两个字符串由相同的字母组成但排列方式不同(字符串字谜)算法(附完整源码)
查看>>
Objective-C实现两个日期之间的天数(附完整源码)
查看>>
Objective-C实现两个栈实现队列算法(附完整源码)
查看>>
Objective-C实现两个队列实现栈算法(附完整源码)
查看>>
Objective-C实现两数之和问题(附完整源码)
查看>>
Objective-C实现中介者模式(附完整源码)
查看>>
Objective-C实现中值滤波(附完整源码)
查看>>
Objective-C实现中国剩余定理(附完整源码)
查看>>
Objective-C实现中国剩余定理(附完整源码)
查看>>
Objective-C实现中文模糊查询(附完整源码)
查看>>
Objective-C实现串口通讯(附完整源码)
查看>>
Objective-C实现串逐位和(附完整源码)
查看>>
Objective-C实现串链式存储简单匹配(附完整源码)
查看>>
Objective-C实现主存储器空间的分配和回收(附完整源码)
查看>>
Objective-C实现乘方运算---m的n次方(附完整源码)
查看>>
Objective-C实现乘法持续性multiplicative persistence算法(附完整源码)
查看>>
Objective-C实现二分查找最接近的数值m(附完整源码)
查看>>
Objective-C实现二分查找最接近的数值m(附完整源码)
查看>>
Objective-C实现二叉搜索树算法(附完整源码)
查看>>