如何使用java访问github graphql API

Question

我需要访问GitHub graphql API以获得关于某个存储库的一些数据。下面的curl命令可以正常工作

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中调用相同的代码，因为我需要操作输出。下面是我尝试过的代码，

  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();
    }

}

我做错了什么？你能帮我解决这个问题吗。提前致谢

Answer 1

通过如下更改上面的代码使程序工作。使用JSON库创建复杂的JSON是一个很好的做法，而不是手动创建，因为大多数情况下，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();
        }


    }