如何从java访问github graphql API而不在java中运行curl命令
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【中文标题】如何从java访问github graphql API而不在java中运行curl命令【英文标题】：how to access the github graphql API from java without running curl commands inside java 【发布时间】：2017-06-23 03:51:55 【问题描述】：请原谅我的长问题，因为我是graphql 的初学者。我需要访问github graphql API 以获取某个文件的责任详情，因为到目前为止github API version 3 中没有责任REST API。我可以获得以下graphql 查询的输出，该查询在here 中运行
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 中运行相同的 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();
有没有其他方法可以在不运行 curl 命令的情况下在 java 中获得相同的输出，因为在 java 中运行 curl 命令不是一个好习惯（根据我的观点）。提前致谢
使用 httpClient 代码更新
这是我尝试使用apache httpClient 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();
但即使是 repository(owner:\"wso2\",name:\"product-is\")description 的小查询，它也会给我
"message":"解析 JSON 的问题","documentation_url":"https://developer.github.com/v3"
但是当像这样的简单查询通过String temp="viewer email login "; 时，它可以工作。我的代码有什么问题。请帮忙
【问题讨论】：
【参考方案1】：问题在于您添加了一个额外的“查询”词，应该是 像这样：
(...)
StringEntity entity= new StringEntity("\"query\":\""+temp+"\"");
虽然我应该提醒您，您应该尽可能避免尝试对 json 进行硬编码，因此，理想情况下您应该使用 JSON 库，从而产生类似这样的内容（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();
记下转义的双引号是如何使 java 可以将其理解为单个字符串的。
【讨论】：
【参考方案2】：@AdrianoMartins 的答案是正确的，但我可以通过简单地修改该行来让我的程序正常工作
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 ";
到
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 ";
所以整个程序会是这样的
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 还建议使用 JSON 库比硬编码 JSON 更好
【讨论】：
【参考方案3】：你也应该添加
responce.close()
这里建议http://hc.apache.org/httpcomponents-client-4.4.x/tutorial/html/fundamentals.html#d5e145
【讨论】：
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