ASP.net中用到的JWT

1.先通过NuGet添加JWT

2.新建一个JwtHelp类

 public class JwtHelp
     {

         //私钥  web.config中配置
         //"GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk";
         private static string secret = "footmark";

         /// <summary>
         /// 生成JwtToken
         /// </summary>
         /// <param name="payload">不敏感的用户数据</param>
         /// <returns></returns>
         public static string SetJwtEncode()
         {

             //格式如下
             IDateTimeProvider provider = new UtcDateTimeProvider();
             var now = provider.GetNow();
             var unixEpoch = new DateTime(, , , , , , DateTimeKind.Utc);
             //过期时间
             var secondsSinceEpoch = Math.Round((now - unixEpoch).TotalSeconds);  

             var payload = new Dictionary<string, object>
             {
                 { "exp", secondsSinceEpoch+ },  //3600秒后过期
                 { "username","admin" },
                 { "password","" }
             };

             IJwtAlgorithm algorithm = new HMACSHA256Algorithm();
             IJsonSerializer serializer = new JsonNetSerializer();
             IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
             IJwtEncoder encoder = new JwtEncoder(algorithm, serializer, urlEncoder);

             var token = encoder.Encode(payload, secret);
             return token;
         }

         /// <summary>
         /// 根据jwtToken  获取实体
         /// </summary>
         /// <param name="token">jwtToken</param>
         /// <returns></returns>
         public static string GetJwtDecode(string token)
         {
             try
             {
                 IJsonSerializer serializer = new JsonNetSerializer();
                 IDateTimeProvider provider = new UtcDateTimeProvider();
                 IJwtValidator validator = new JwtValidator(serializer, provider);
                 IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
                 IJwtDecoder decoder = new JwtDecoder(serializer, validator, urlEncoder);
                 //token为之前生成的字符串
                 var userInfo = decoder.DecodeToObject(token, secret, verify: true);
                 //此处json为IDictionary<string, object> 类型
                 string username = userInfo["username"].ToString();  //可获取当前用户名
                 return "OK";

             }
             catch (TokenExpiredException)
             {
                 Console.WriteLine("Token has expired");
             }
             catch (SignatureVerificationException)
             {
                 Console.WriteLine("Token has invalid signature");
             }
             catch (Exception)
             {

             }
             return "Error";
         }
     }