使用SpringBoot+OkHttp+fastjson实现Github的OAuth第三方登录

//官方文档：    public static final MediaType JSON 
//        = MediaType.get("application/json; charset=utf-8"); 
 MediaType mediaType = MediaType.get("application/json; charset=utf-8");//去掉前缀，并且修改MediaType对象名,因为一会使用fastjson变量会重名 
 OkHttpClient client = new OkHttpClient();//第二句照抄
 RequestBody body = RequestBody.create(json,mediaType);//直接复制方法体中的内容
 Request request = new Request.Builder() 
    .url("")//填写要发送请求的地址 
    .post(body) 
    .build(); 
try (Response response = client.newCall(request).execute()) { 
     return response.body().string();//返回的字符串(json)
} 

OkHttpClient client = new OkHttpClient();//同上
 Request request = new Request.Builder()//直接复制方法体中的内容
   .url(url)//同上
   .build();

 try (Response response = client.newCall(request).execute()) {
  return response.body().string();//同上
 }

JSON.toJSONString(实体类)//将实体类转换为JSON字符串
JSON.parseObject(string, 实体类.class);//将JSON字符串转换为实体类

<a href="https://github.com/login/oauth/authorize?client_id=xxx&redirect_uri=http://127.0.0.1:8080/xxx&scope=user&state=1" rel="external nofollow" >Login</a>
//scope和state不写可能会报错

@Controller 
public class AuthorizeController { 
 
 @Autowired 
 GithubProvider githubProvider; 
 
 @GetMapping("/callback") 
 public String callback(@RequestParam(name ="code") String code, @RequestParam(name ="state") String state){ 
   AccessTokenDTO accessTokenDTO = new AccessTokenDTO(); 
   accessTokenDTO.setClient_id(""); 
   accessTokenDTO.setClient\_secret(""); 
   accessTokenDTO.setCode(code); 
   accessTokenDTO.setState(state); 
   accessTokenDTO.setRedirect\_uri("https://github.com/login/oauth/access_token"); 
   String token = githubProvider.getAccessToken(accessTokenDTO); 
   GithubUser githubUser = githubProvider.getUser(token); 
   return "index"; 
 } 
 
}

@Component 
public class GithubProvider { 
 
  public String getAccessToken(AccessTokenDTO accessTokenDTO){ 
    MediaType mediaType = MediaType.get("application/json; charset=utf-8");
    OkHttpClient client = new OkHttpClient();
    RequestBody body = RequestBody.create(JSON.toJSONString(accessTokenDTO),mediaType);//用fastjson将实体类转换为json字符串传入
    Request request = new Request.Builder() 
         .url("https://github.com/login/oauth/access_token?cilen_id=xxx&client_secret=xxx"+accessTokenDTO.getCode()+ 
            "&redirect_uri=http://127.0.0.1:8080/callback&state=1") 
        .post(body) 
        .build(); 
    try (Response response = client.newCall(request).execute()) { 
      String string = response.body().string(); 
      String token = string.split("&")\[0\].split("=")\[1\];  
      return token; 
 } catch (IOException e) { 
      e.printStackTrace(); 
 } 
    return null; 
 } 
 
  public GithubUser getUser(String token){ 
    OkHttpClient client = new OkHttpClient(); 
    Request request = new Request.Builder() 
        .url("https://api.github.com/user?access_token="+token) 
        .build();  
    try (Response response = client.newCall(request).execute()) { 
      String string = response.body().string(); 
      GithubUser githubUser = JSON.parseObject(string, GithubUser.class);//用fastjson将json字符串转换为实体类
      return githubUser; 
 } catch (IOException e) { 
      e.printStackTrace(); 
 } 
    return null; 
 } 
 
}