.net framework jwt

核心步骤：
>i ->1. 创建签名凭证   （秘钥，算法）
->2. 创建负载数据  （Claim[]）
->3. 创建JWTToken
->4. 转换为JWT字符串

- System.IdentityModel.Tokens.Jwt

```java
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;
using Microsoft.IdentityModel.Tokens;

```
## 生成JWT代码
```java
// # 设置JWT的密钥
string secretKey = "your_secret_key";
byte[] keyBytes = Encoding.UTF8.GetBytes(secretKey);
var securityKey = new SymmetricSecurityKey(keyBytes);

// # 创建JWT的签名凭证
var signingCredentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

// # 设置JWT的Claims
var claims = new[]
{
   new Claim(ClaimTypes.Name, "John Doe"),
   new Claim(ClaimTypes.Email, "john.doe@example.com"),
   // 添加其他需要的声明
};

// # 创建JWT的Token
var token = new JwtSecurityToken(
   issuer: "your_issuer",
   audience: "your_audience",
   claims: claims,
   expires: DateTime.Now.AddDays(1),
   signingCredentials: signingCredentials
);

// # 生成JWT字符串
var jwtToken = new JwtSecurityTokenHandler().WriteToken(token);

```

## 验证JWT
```java
// 验证JWT的密钥
var tokenValidationParameters = new TokenValidationParameters
{
   ValidateIssuer = true,
   ValidateAudience = true,
   ValidateIssuerSigningKey = true,
   IssuerSigningKey = securityKey,
   ValidIssuer = "your_issuer",
   ValidAudience = "your_audience"
};

// 验证JWT字符串
var claimsPrincipal = new JwtSecurityTokenHandler().ValidateToken(jwtToken, tokenValidationParameters, out _);

```