1.JWT定义html
JWT（Json Web Token)是一种用于双方之间传递安全信息的简洁的、URL安全的表述性声明规范。JWT做为一个开放的标准（ RFC 7519 ），定义了一种简洁的，自包含的方法用于通讯双方之间以Json对象的形式安全的传递信息。由于数字签名的存在，这些信息是可信的，JWT能够使用HMAC算法或者是RSA的公私秘钥对进行签名。算法
2.JWT的组成部分json
（1）JWT通常由三段构成，用.号分隔开，第一段是header，第二段是payload，第三段是signature，安全
例如：eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQide
具体各部分介绍可查看简书（http://www.jianshu.com/p/576dbf44b2ae）post
3.Jwt.Net 使用url
首先，须要先引入Jwt.Net,可经过nuget的方式添加：Install-Package JWT -Version 2.4.2（本身选择合适的版本）spa
（1）建立token，此处，咱们只须要自定义payload和secrect密钥便可，可生成三段格式的字符串.net
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var
payload =
new
Dictionary<
string
,
object
>
{
{
"claim1"
, 0 },
{
"claim2"
,
"claim2-value"
}
};
var
secret =
"GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk"
;
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);
Console.WriteLine(token);
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（2）token解密，可看到输出为{ "claim1": 0, "claim2": "claim2-value" }，能够用json["claim1"]，json["claim2"]的方式获取各个值，此处json为IDictionary<string,object>类型unix
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var
token =
"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJjbGFpbTEiOjAsImNsYWltMiI6ImNsYWltMi12YWx1ZSJ9.8pwBI_HtXqI3UgQHQ_rDRnSQRxFL1SR8fbQoS-5kM5s"
;
var
secret =
"GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk"
;
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);
var
json = decoder.Decode(token, secret, verify:
true
);
Console.WriteLine(json);
}
catch
(TokenExpiredException)
{
Console.WriteLine(
"Token has expired"
);
}
catch
(SignatureVerificationException)
{
Console.WriteLine(
"Token has invalid signature"
);
}
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（3）添加过时时间，过时时间即这个时间以后JWT不接受处理，时间的有效值为某一时刻和1970/1/1 00:00：00 相差的秒数
下面的例子是当前时间到1970/1/1 00：00：00 的秒数，即过时时间为当前时间。若是设置为当前时间+10秒，可添加secondsSinceEpoch=secondsSinceEpoch+10
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IDateTimeProvider provider =
new
UtcDateTimeProvider();
var
now = provider.GetNow();
var
unixEpoch =
new
DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
// or use JwtValidator.UnixEpoch
var
secondsSinceEpoch = Math.Round((now - unixEpoch).TotalSeconds);
var
payload =
new
Dictionary<
string
,
object
>
{
{
"exp"
, secondsSinceEpoch }
};
var
secret =
"GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk"
;
var
token = encoder.Encode(payload, secret);
var
json = decoder.Decode(token, secret);
// TokenExpiredException
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（4）也可自定义json解析器，只要继承IJsonSerializer接口
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public
class
CustomJsonSerializer : IJsonSerializer
{
public
string
Serialize(
object
obj)
{
// Implement using favorite JSON Serializer
}
public
T Deserialize<T>(
string
json)
{
// Implement using favorite JSON Serializer
}
}
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使用该解析器
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IJwtAlgorithm algorithm =
new
HMACSHA256Algorithm();
IJsonSerializer serializer =
new
CustomJsonSerializer();
IBase64UrlEncoder urlEncoder =
new
JwtBase64UrlEncoder();
IJwtEncoder encoder =
new
JwtEncoder(algorithm, serializer, urlEncoder);
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