获取验证码接口:
/// <summary> /// 获取验证码 /// </summary> /// <returns></returns> [AllowAnonymous] public FileResult VerificationCode( { return File(this.CreateCheckCodeImage(GenerateCheckCode(.ToArray(, "image/Gif"; }
private string GenerateCheckCode(
{
int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random(;
for (int i = 0; i < 5; i++
{
number = random.Next(;
if (number % 2 == 0
code = (char('0' + (char(number % 10;
else
code = (char('A' + (char(number % 26;
if (code == '0'
code = 'M';
checkCode += code.ToString(;
}
Session["CheckCode"] = checkCode;
return checkCode;
}
private MemoryStream CreateCheckCodeImage(string checkCode
{
if (checkCode == null || checkCode.Trim( == String.Empty
return null;
System.Drawing.Bitmap image = new System.Drawing.Bitmap((intMath.Ceiling((checkCode.Length * 26.5, 30;
Graphics g = Graphics.FromImage(image;
try
{
//生成随机生成器
Random random = new Random(;
//清空图片背景色
g.Clear(Color.White;
//画图片的背景噪音线
for (int i = 0; i < 25; i++
{
int x1 = random.Next(image.Width;
int x2 = random.Next(image.Width;
int y1 = random.Next(image.Height;
int y2 = random.Next(image.Height;
g.DrawLine(new Pen(Color.ForestGreen, x1, y1, x2, y2;
}
Font font = new System.Drawing.Font("Tahoma", 20, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic;
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height, Color.ForestGreen, Color.DarkRed, 1.2f, true;
g.DrawString(checkCode, font, brush, -5, -5;
//画图片的前景噪音点
for (int i = 0; i < 80; i++
{
int x = random.Next(image.Width;
int y = random.Next(image.Height;
image.SetPixel(x, y, Color.FromArgb(random.Next(;
}
System.IO.MemoryStream ms = new System.IO.MemoryStream(;
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif;
return ms;
}
finally
{
g.Dispose(;
image.Dispose(;
}
}
验证验证码接口:
/// <summary> /// 验证 验证码是否正确 /// </summary> /// <param name="Code"></param> /// <returns></returns> private bool CheckCode(string Code { if (HttpContext.Current.Session["CheckCode"] == null { HttpContext.Current.Session.Remove("CheckCode"; return false; } if (HttpContext.Current.Session["CheckCode"].ToString(.Equals(Code, StringComparison.CurrentCultureIgnoreCase == false { HttpContext.Current.Session.Remove("CheckCode"; return false; } HttpContext.Current.Session.Remove("CheckCode"; return true; }
使用的测试工具是APIpost，经过测试两个接口通过session存取验证码没有问题，都是可以调通的，但是部署项目的时候因为是前后端分离项目，需要配置跨域，跨域可以选择前端配置以及后端配置。
配置完成之后，前端调用验证码接口一直验证失败，经过日志输出，发现是session丢失问题，到这里有两个解决方案
跨域注意
1.前端ajax访问时要加上“xhrFields: {withCredentials: true}”，实现session可以传递；
2.配置拦截器，response.setHeader(“Access-Control-Allow-Origin”, “*”，实现跨域访问问题；
3.配置拦截器，response.addHeader(“Access-Control-Allow-Credentials”, “true”，实现session传值问题；*
4.配置拦截器，如果配置了Access-Control-Allow-Credentials=true，则跨域拦截Access-Control-Allow-Origin 必须是指定的url，response.setHeader(“Access-Control-Allow-Origin”, url;
CacheHelp.Set(
key: "验证码缓存",
value: checkCode,
Seconds: 7200 //缓存时长，单位“秒”
;
public class CacheHelp
{
/// <summary>
/// 缓存指定对象，设置缓存
/// </summary>
/// <param name="key">缓存的key</param>
/// <param name="value">缓存的值</param>
/// <param name="Seconds">设置缓存时间；单位：秒</param>
/// <returns></returns>
public static bool Set(string key, object value, double Seconds
{
return Set(key, value, null, DateTime.Now.AddSeconds(Seconds, Cache.NoSlidingExpiration,
CacheItemPriority.Default, null;
}
/// <summary>
/// 缓存指定对象，设置缓存
/// </summary>
public static bool Set(string key, object value, string path
{
try
{
var cacheDependency = new CacheDependency(path;
return Set(key, value, cacheDependency;
}
catch
{
return false;
}
}
/// <summary>
/// 缓存指定对象，设置缓存
/// </summary>
public static bool Set(string key, object value, CacheDependency cacheDependency
{
return Set(key, value, cacheDependency, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,
CacheItemPriority.Default, null;
}
/// <summary>
/// 缓存指定对象，设置缓存
/// </summary>
public static bool Set(string key, object value, double seconds, bool isAbsulute
{
return Set(key, value, null, (isAbsulute ? DateTime.Now.AddSeconds(seconds : Cache.NoAbsoluteExpiration,
(isAbsulute ? Cache.NoSlidingExpiration : TimeSpan.FromSeconds(seconds, CacheItemPriority.Default,
null;
}
/// <summary>
/// 获取缓存对象
/// </summary>
public static object Get(string key
{
return GetPrivate(key;
}
/// <summary>
/// 判断缓存中是否含有缓存该键
/// </summary>
public static bool Exists(string key
{
return (GetPrivate(key != null;
}
/// <summary>
/// 移除缓存对象
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static bool Remove(string key
{
if (string.IsNullOrEmpty(key
{
return false;
}
HttpRuntime.Cache.Remove(key;
return true;
}
/// <summary>
/// 移除所有缓存
/// </summary>
/// <returns></returns>
public static bool RemoveAll(
{
IDictionaryEnumerator iDictionaryEnumerator = HttpRuntime.Cache.GetEnumerator(;
while (iDictionaryEnumerator.MoveNext(
{
HttpRuntime.Cache.Remove(Convert.ToString(iDictionaryEnumerator.Key;
}
return true;
}
/// <summary>
/// 尝试获取缓存，不存在则执行匿名委托
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <param name="func"></param>
/// <param name="Seconds">设置缓存时间；单位：秒</param>
/// <returns></returns>
public static T TryGet<T>(string key, Func<T> func, double Seconds
{
if (Exists(key return (TGet(key;
var result = func.Invoke(;
Set(key, result, Seconds;
return result;
}
/// <summary>
/// 设置缓存
/// </summary>
public static bool Set(string key, object value, CacheDependency cacheDependency, DateTime dateTime,
TimeSpan timeSpan, CacheItemPriority cacheItemPriority, CacheItemRemovedCallback cacheItemRemovedCallback
{
if (string.IsNullOrEmpty(key || value == null
{
return false;
}
HttpRuntime.Cache.Insert(key, value, cacheDependency, dateTime, timeSpan, cacheItemPriority,
cacheItemRemovedCallback;
return true;
}
/// <summary>
/// 获取缓存
/// </summary>
private static object GetPrivate(string key
{
return string.IsNullOrEmpty(key ? null : HttpRuntime.Cache.Get(key;
}
}
希望小伙伴们遇到这种问题时候能够有一个解决思路！