jwt 验证方法 (ASP.NET Core)

一、安装包

二、实现，生成secretKey和jwtToken，可以在线生成

JWT在线解码/编码工具 - 解析、验证、生成JSON Web Token

Program.cs

using System.Security.Claims;var secretKey = \"50nZpLVvKQ1WYkhSCTiO3LvdCr0G8hcaQF4pUIkOJNfvBFiMKvI4zXnWTPkDsel7QH3vtfF224kKFe84IFalDQ==\";var jwtToken = \"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNzUzNDUwMDMwLCJuYmYiOjE3NTM0NTAwMzAsImV4cCI6MTc1MzQ1MzYzMH0.tCkEzCh6N6XU9_YQ7manDo3zr2_Xz3wIWNfYqqKdDQI\";var validator = new JwtValidator(secretKey);var principal = validator.ValidateToken(jwtToken);if (principal != null){ Console.WriteLine(\"Token is valid!\"); Console.WriteLine($\"Subject: {principal.FindFirst(ClaimTypes.NameIdentifier)?.Value}\"); Console.WriteLine($\"Name: {principal.FindFirst(ClaimTypes.Name)?.Value}\");}else{ Console.WriteLine(\"Token is invalid!\");}

添加类：JwtValidator.cs

using System;using System.IdentityModel.Tokens.Jwt;using System.Security.Claims;using System.Text;using Microsoft.IdentityModel.Tokens;public class JwtValidator{ private readonly string _secretKey; private readonly string _issuer; private readonly string _audience; public JwtValidator(string secretKey, string issuer = null, string audience = null) { _secretKey = secretKey; _issuer = issuer; _audience = audience; } public ClaimsPrincipal ValidateToken(string token) { try { var tokenHandler = new JwtSecurityTokenHandler(); var key = Encoding.ASCII.GetBytes(_secretKey); var validationParameters = new TokenValidationParameters { ValidateIssuerSigningKey = true, IssuerSigningKey = new SymmetricSecurityKey(key), ValidateIssuer = !string.IsNullOrEmpty(_issuer), ValidIssuer = _issuer, ValidateAudience = !string.IsNullOrEmpty(_audience), ValidAudience = _audience, ValidateLifetime = true, ClockSkew = TimeSpan.Zero }; SecurityToken validatedToken; return tokenHandler.ValidateToken(token, validationParameters, out validatedToken); } catch (SecurityTokenException ex) { // Token 验证失败 Console.WriteLine($\"Token validation failed: {ex.Message}\"); return null; } catch (Exception ex) { // 其他异常 Console.WriteLine($\"Error validating token: {ex.Message}\"); return null; } } }