如何使用Java访问github graphql API

Question

我需要访问github graphql API以获得有关某个存储库的一些数据。以下curl命令很好用

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，我需要调用相同的名称Java来操纵输出。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，它向我显示此错误，

HttpResponseProxy {HTTP / 1.1
400错误的请求[服务器：GitHub.com，日期：2017年2月3日，星期五，格林尼治标准时间12:14:58，内容类型：application /
json; charset = utf-8，内容长度：89，状态：400错误的请求，X-RateLimit-Limit：200，X-RateLimit-
Remaining：187，X-RateLimit-Reset：1486125149，X-OAuth-
Scopes：repo，用户，X-Accepted-OAuth-Scopes：回购，X-GitHub-Media-
Type：github.v3；format = json，Access-Control-Expose-Header：ETag，链接，X-GitHub-
OTP，X-RateLimit-Limit，X-RateLimit-Remaining，X-RateLimit-Reset，X-OAuth-
Scopes，X-Accepted- OAuth范围，X轮询间隔，访问控制允许来源：*，内容安全策略：default-
src’none’，严格传输安全性：max-age = 31536000; includeSubdomains; 预加载，X-Content-Type-
Options：nosniff，X-Frame-Options：deny，X-XSS-Protection：1；模式=块，X-GitHub-
Request-Id：CF0A：0EE1：B057F26：EBCB8DF：58947441] ResponseEntityProxy
{[Content-Type：application / json; charset = utf-8，内容长度：89，已压缩：false]}}

我做错了什么？您能帮我解决这个问题吗？提前致谢

Answer 1

通过更改以下代码使程序正常工作。与大多数情况下一样，使用JSON库来JSON像上面那样创建复合体是一个好习惯，而不是像大多数时候手动创建那样，手动创建复合体JSON可能会带来很多麻烦。

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();
        }


    }