.net core 学习小结之 PostMan报415

• 首先415的官方解释是：对于当前请求的方法和所请求的资源，请求中提交的实体并不是服务器中所支持的格式，因此请求被拒绝。
• 也就是说我所准备的数据格式并不是后台代码使用的数据格式
• 后台代码如下

  using System;
  using System.Collections.Generic;
  using System.ComponentModel.DataAnnotations;
  using System.Linq;
  using System.Threading.Tasks;
  using Microsoft.AspNetCore.Mvc;
  
  namespace JwtAuth.Controllers
  {
      using System.Security.Claims;
      using Microsoft.Extensions.Options;
      using Microsoft.IdentityModel.Tokens;
      using Microsoft.AspNetCore.Authentication.JwtBearer;
      //添加dll的引用 Nuget Microsoft.AspNetCore.Authentication.JwtBearer;
      using System.IdentityModel.Tokens.Jwt;
       [Route("api/[controller]")]
      public class AuthController : Controller
      {
          public JwtSettings settings;
          public AuthController(IOptions<JwtSettings> jwtsettings)
          {
              settings = jwtsettings.Value;
          }
          [HttpPost]
          public IActionResult Token([FromBody]LoginInfo model)
          {
              if (ModelState.IsValid)
              {
                  if (model.username == "cyao" && model.password == "")
                  {
                      //用户合法情况
                      //添加授权信息
                      var claims = new Claim[] { new Claim(ClaimTypes.Name, "cyao"), new Claim(ClaimTypes.Role, "admin") };
                      var key = new SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes(settings.SecretKey));
                      var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
                      var token = new JwtSecurityToken(
                          settings.Issuer,
                          settings.Audience,
                          claims,
                          DateTime.Now,
                          DateTime.Now.AddMinutes(),//过期时间
                          creds);
                      return Ok(new { token = new JwtSecurityTokenHandler().WriteToken(token) });
                  }
              }
              return BadRequest();
          }
      }
      public class LoginInfo
      {
          [Required]
          public string username { get; set; }
          [Required]
          public string password { get; set; }
      }
  }

• 使用POSTMan如何构造一个
  [FromBody]？错误示例（图1.0）
• 正确示例如下图2.0（图2.0）
• 或者使用图1.0的配置将后台代码参数的标签改成[FromForm]