如何从Java访问github graphql API而不在Java内部运行curl命令

Question

因为我是graphql的初学者， graphql请问我一个长问题。 我需要访问github graphql API来获取某个文件上的责任详细信息，因为到目前为止， github API版本3中还没有责任REST API 。 我可以获取以下在这里运行的graphql查询的输出

  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
              }
            }
          }
        }
      }
    }
  }
}

在终端中运行以下curl命令

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

并在Java内部运行相同的curl命令，如下所示

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Demo {
    public static void main(String[] args) {

        String url="https://api.github.com/graphql";
           String[] command = {"curl", "-H" ,"Authorization: Bearer myGitHubToken","-H","Accept:application/json","-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 } } } } } } } }\"}" , url};
            ProcessBuilder process = new ProcessBuilder(command); 
            Process p;
            try
            {
                p = process.start();
                 BufferedReader reader =  new BufferedReader(new InputStreamReader(p.getInputStream()));
                    StringBuilder builder = new StringBuilder();
                    String line = null;
                    while ( (line = reader.readLine()) != null) {
                            builder.append(line);
                            builder.append(System.getProperty("line.separator"));
                    }
                    String result = builder.toString();
                    System.out.print(result);

            }
            catch (IOException e)
            {   System.out.print("error");
                e.printStackTrace();
            }
    }

}

还有其他方法可以在不运行curl命令的情况下在java获得相同的输出，因为在java运行curl命令不是一种好习惯（根据我的观点）。 提前致谢

使用httpClient代码更新

这是我用apache httpClient尝试过的代码

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");


        String temp="{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 } } } } } } } }";

//        String temp="{repository(owner:\"wso2\",name:\"product-is\"){description}}";

        try {

           StringEntity entity= new StringEntity("{\"query\":\"query "+temp+"\"}");

            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();
        }


    }

但即使使用{repository(owner:\\"wso2\\",name:\\"product-is\\"){description}}的小查询，它也能带给我

{“ message”：“问题解析JSON”，“ documentation_url”：“ https://developer.github.com/v3 ”}

但是当传递这样的简单查询时， String temp="{viewer {email login }}"; 有用。 我的代码有什么问题。 请帮忙

Answer 1

这个问题几乎是您添加了一个额外的“查询”一词，应该是这样的：

(...)
StringEntity entity= new StringEntity("{\"query\":\""+temp+"\"}");

尽管我应该提醒您，您应该避免尝试对json进行硬编码，但是，理想的情况下，您应该使用JSON库，从而产生如下所示（完整代码）：

import org.json.JSONObject; // New import

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();
        }


    }

请注意转义的双引号仅是那些，以便java可以将其理解为单个字符串。

Answer 2

@AdrianoMartins的答案是正确的，但是我只需修改该行就可以使我的程序正常工作

String temp="{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 } } } } } } } }";

至

String temp="{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 } } } } } } } }";

所以整个程序将是

    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");


        String temp="{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 } } } } } } } }";

//        String temp="{repository(owner:\"wso2\",name:\"product-is\"){description}}";

        try {

           StringEntity entity= new StringEntity("{\"query\":\"query "+temp+"\"}");

            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();
        }


    }

正如Adriano Martins还建议的那样，使用JSON库比对JSON硬编码更好

Answer 3

您还应该添加

responce.close()

根据此处的建议http://hc.apache.org/httpcomponents-client-4.4.x/tutorial/html/fundamentals.html#d5e145