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

一、在GitHub上创建一个OAuth

二、OAuth的原理

Spring官方文档

三、OkHttp的使用

OkHttp官方网站

1.Post

代码示例

//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)
} 

2.Get

代码示例

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
 }

四、fastJson的使用

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

五、代码示例

前端代码

<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;
 } 

}

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