如何使用 java 访问 github graphql API

Posted 2023-03-08

【中文标题】如何使用 java 访问 github graphql API

【英文标题】：how to access github graphql API using java

【发布时间】：2017-06-20 19:40:14

【问题描述】：

我需要访问github graphql API 以获取有关某个存储库的一些数据。以下curl 命令运行良好

curl -i -H "Authorization: bearer myGithubToken" -X POST -d '"query": "query  repository(owner: \"wso2-extensions\", name: \"identity-inbound-auth-oauth\")  object(expression:\"83253ce50f189db30c54f13afa5d99021e2d7ece\")  ... on Commit  blame(path: \"components/org.wso2.carbon.identity.oauth.endpoint/src/main/java/org/wso2/carbon/identity/oauth/endpoint/authz/OAuth2AuthzEndpoint.java\")  ranges  startingLine endingLine age commit  message url history(first: 2)  edges  node   message url    author  name email        "' https://api.github.com/graphql

现在我需要在Java 中调用相同的函数，因为我需要操纵输出。这是我尝试过的代码，

  public void callGraphqlApi()
    CloseableHttpClient httpClientForGraphql = null;
    CloseableHttpResponse httpResponseFromGraphql= null;

    httpClientForGraphql=HttpClients.createDefault();
    HttpPost httpPost= new HttpPost("https://api.github.com/graphql");

    String query= "query\":\"query  repository(owner: \"wso2-extensions\", name:\"identity-inbound-auth-oauth\")  object(expression: \"83253ce50f189db30c54f13afa5d99021e2d7ece\")  ... on Commit  blame(path: \"components/org.wso2.carbon.identity.oauth.endpoint/src/main/java/org/wso2/carbon/identity/oauth/endpoint/authz/OAuth2AuthzEndpoint.java\")  ranges  startingLine endingLine age commit  message url history(first: 2)  edges  node  message url    author  name email        ";


    httpPost.addHeader("Authorization","Bearer myGithubToken");

    try 

        StringEntity params= new StringEntity(query);

        httpPost.addHeader("content-type","application/x-www-form-urlencoded");
        httpPost.setEntity(params);
        httpResponseFromGraphql= httpClientForGraphql.execute(httpPost);

     catch (UnsupportedEncodingException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
    


    catch (ClientProtocolException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
     catch (IOException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
    

当我调试代码时，它显示了这个错误，

HttpResponseProxyHTTP/1.1 400 错误请求 [服务器：GitHub.com，日期：格林威治标准时间 2017 年 2 月 3 日星期五 12:14:58，内容类型：application/json； charset=utf-8, Content-Length: 89, Status: 400 Bad Request, X-RateLimit-Limit: 200, X-RateLimit-Remaining: 187, X-RateLimit-Reset: 1486125149, X-OAuth-Scopes: repo,用户，X-Accepted-OAuth-Scopes：repo，X-GitHub-Media-Type：github.v3；格式=json，Access-Control-Expose-Headers：ETag，链接，X-GitHub-OTP，X-RateLimit-Limit，X-RateLimit-Remaining，X-RateLimit-Reset，X-OAuth-Scopes，X-Accepted- OAuth-Scopes, X-Poll-Interval, Access-Control-Allow-Origin: *, Content-Security-Policy: default-src 'none', Strict-Transport-Security: max-age=31536000;包括子域；预加载，X-Content-Type-Options：nosniff，X-Frame-Options：拒绝，X-XSS-Protection：1； mode=block, X-GitHub-Request-Id: CF0A:0EE1:B057F26:EBCB8DF:58947441] ResponseEntityProxy[Content-Type: application/json; charset=utf-8,Content-Length: 89,Chunked: false]

我做错了什么？请你好心帮我解决这个问题。 提前致谢

【问题讨论】：

我看起来您的 JSON 无效：应该以 String query= "\"query\":\"query 开头，而不是 String query= "query\":\"query 跨度>

@peinearydevelopment 检查它仍然是同样的错误:(

【参考方案1】：

通过如下更改上述代码使程序正常工作。使用JSON 库来创建复杂的JSON 是一个很好的做法，而不是手动创建它，因为大多数时候手动创建复杂的JSON 可能会导致很多麻烦。

import org.json.JSONObject;

public void callingGraph()
        CloseableHttpClient client= null;
        CloseableHttpResponse response= null;

        client= HttpClients.createDefault();
        HttpPost httpPost= new HttpPost("https://api.github.com/graphql");

        httpPost.addHeader("Authorization","Bearer myToken");
        httpPost.addHeader("Accept","application/json");

        JSONObject jsonObj = new JSONObject();     
        jsonobj.put("query", "repository(owner: \"wso2-extensions\", name: \"identity-inbound-auth-oauth\")  object(expression: \"83253ce50f189db30c54f13afa5d99021e2d7ece\")  ... on Commit  blame(path: \"components/org.wso2.carbon.identity.oauth.endpoint/src/main/java/org/wso2/carbon/identity/oauth/endpoint/authz/OAuth2AuthzEndpoint.java\")  ranges  startingLine, endingLine, age, commit  message url history(first: 2)  edges  node   message, url    author  name, email        ");

        try 
            StringEntity entity= new StringEntity(jsonObj.toString());

            httpPost.setEntity(entity);
            response= client.execute(httpPost);

        

        catch(UnsupportedEncodingException e)
            e.printStackTrace();
        
        catch(ClientProtocolException e)
            e.printStackTrace();
        
        catch(IOException e)
            e.printStackTrace();
        

        try
            BufferedReader reader= new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
            String line= null;
            StringBuilder builder= new StringBuilder();
            while((line=reader.readLine())!= null)

                builder.append(line);

            
            System.out.println(builder.toString());
        
        catch(Exception e)
            e.printStackTrace();
        


    

【讨论】：

嗨，我在 Spring Boot 控制器中尝试了上述代码，但出现以下错误：HttpResponseProxyHTTP/1.1 500 Internal Server Error [X-Powered-By: Express, Access-Control-Allow-Origin: *, Date: Tue, 24 Apr 2018 10:01:35 GMT, Connection: keep-alive, Transfer-Encoding: chunked] ResponseEntityProxy[Chunked: true]

如何使用有效负载发出 GET 请求？由于 httpGet 对象没有 setEntity 方法，因此似乎无法调用 GraphQL API。