services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(JwtBearerDefaults.AuthenticationScheme, options =>
            {
                options.TokenValidationParameters = new TokenValidationParameters
                {
                    ValidateIssuer = true,
                    ValidateAudience = true,
                    ValidateLifetime = true,
                    ValidateIssuerSigningKey = true,
                    ValidAudience = "xxx",
                    ValidIssuer = "xxx",
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("bc47a26eb9a59406057dddd62d0898f4")),
                };
            });

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using Microsoft.IdentityModel.Tokens;
using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Security.Claims;
using System.Text;
using System.Threading.Tasks;

namespace JwtTest.Controllers
{
    [ApiController]
    [Route("[controller]/[action]")]
    [Authorize]
    public class WeatherForecastController : ControllerBase
    {
        [HttpGet]
        public ActionResult Get()
        {
            return Ok("ok");
        }

        [HttpPost]
        [AllowAnonymous]
        public ActionResult Login([FromBody] LoginViewModel loginViewModel)
        {
            //验证用户名密码是否正确，错误则不进行后续操作
            {
                //验证逻辑在此省略
            }
			//验证成功则继续运行后面代码，来生成token
            
            //claims是关于用户的一些信息，这部分信息将放在payload中，由于token可以被解密，因此不要把密码放进去
            var claims = new Claim[]
            {
                new Claim(ClaimTypes.Name, loginViewModel.Name)
            };
            //指定生成token所需要的密钥
            SymmetricSecurityKey key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("bc47a26eb9a59406057dddd62d0898f4"));
            //指定数字签名需要使用的密钥和算法
            SigningCredentials credentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

            //生成token
            JwtSecurityToken token = new JwtSecurityToken(issuer: "xxx",
                                                          audience: "xxx",
                                                          claims: claims,
                                                          notBefore: DateTime.Now, //token生效时间
                                                          expires: DateTime.Now.AddMinutes(5), //token有效时间
                                                          signingCredentials: credentials);

            return Ok(new JwtSecurityTokenHandler().WriteToken(token));
        }

    }
}