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一个JWT实际上就是一个字符串，它由三部分组成，头部(header)、载荷(Payload)与签名。

Payload

payload中可以保存用户的信息。

var claims = new Claim[]
{
new Claim(JwtRegisteredClaimNames.Sub, account),
new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
new Claim(JwtRegisteredClaimNames.Iat, now.ToUniversalTime().ToString(),
ClaimValueTypes.Integer64),
//用户名
new Claim(ClaimTypes.Name,account),
//角色
new Claim(ClaimTypes.Role,"a")
};

获取所存放的account

var schemeProvider = context.RequestServices.GetService(typeof(IAuthenticationSchemeProvider)) as IAuthenticationSchemeProvider;
var defaultAuthenticate = await schemeProvider.GetDefaultAuthenticateSchemeAsync();
if (defaultAuthenticate != null)
{
var result = await context.AuthenticateAsync(defaultAuthenticate.Name);
var user = result?.Principal;
if (user != null)
{
account = user.Identity.Name;
}
}