java - 使用 Java 访问 Instagram API 时出现 400 错误

Question

我有一个名为 Autentica 的简单 servlet，它负责获取用于了解 OAuth token 的代码参数。 API 返回到我的回调页面，因此运行名为 callback 的 servlet。问题是我无法从 OAuth 获取 token ，因为我从服务器收到错误 400。我不是网络编程专家，可能是新手错误。

谁能帮帮我？遵循 servlet 代码和控制台结果。非常感谢!

1) 小服务程序

@WebServlet(name = "autentica", urlPatterns = {"/autentica"})
public class Autentica extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        processRequest(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        processRequest(req, resp);
    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();

        //API Credentials
        String client_id = "XXXX";
        String client_secret = "YYYY";
        String redirect_uri = "http://localhost:8080/InstagramAPI/callback";

        //Set Session Variables
        HttpSession session = request.getSession(true);
        session.setAttribute("client_id", client_id);
        session.setAttribute("client_secret", client_secret);
        session.setAttribute("redirect_uri", redirect_uri);

        try {
            //Redirect User to foursquare login page
            String url = "https://api.instagram.com/oauth/authorize/?client_id=" 
                    + client_id + "&redirect_uri=" + redirect_uri
                    + "&response_type=code";
            response.sendRedirect(url);
        } finally {
            out.close();
        }
    }
}

2) Servlet 回调

@WebServlet(name = "callback", urlPatterns = {"/callback"})
public class Callback extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        processRequest(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        processRequest(req, resp);
    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        HttpSession session = request.getSession(true);
        String clientID =(String)session.getAttribute("client_id");
        String clientSecret =(String)session.getAttribute("client_secret");
        String redirectURI =(String)session.getAttribute("redirect_uri");  
        String code = request.getParameter("code");

        String url = "https://api.instagram.com/oauth/access_token?"
                + "client_id=" + clientID
                + "&client_secret=" + clientSecret
                + "&grant_type=authorization_code"
                + "&redirect_uri=" + redirectURI
                + "&code="+code;
        getContent(url);
    }

    //Return response after GET Request
    public String getContent(String httpurl){
        try {
            URL url = new URL(httpurl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    conn.getInputStream()));
            String strLine = "";
            String content = "";
            while ((strLine = in.readLine()) != null){
                 content = content+strLine;
            }
            in.close();
            System.out.println("DEBUG = "+content);
            return content;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

3) 控制台

INFO: InstagramAPI was successfully deployed in 990 milliseconds.
SEVERE: java.io.IOException: Server returned HTTP response code: 400 for URL: https://api.instagram.com/oauth/access_token?client_id=XXXX&client_secret=YYYY&grant_type=authorization_code&redirect_uri=http://localhost:8080/InstagramAPI/callback&code=7049a73c0dfe43528115fe1a52ff4e0e
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1615)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
    at Callback.getContent(Callback.java:61)
    at Callback.processRequest(Callback.java:52)
    at Callback.doGet(Callback.java:29)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)

SEVERE:     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1615)
SEVERE:     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
SEVERE:     at Callback.getContent(Callback.java:61)
SEVERE:     at Callback.processRequest(Callback.java:52)
SEVERE:     at Callback.doGet(Callback.java:29)
SEVERE:     at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
SEVERE:     at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
SEVERE:     at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
SEVERE:     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
SEVERE:     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
SEVERE:     at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
SEVERE:     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
SEVERE:     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
SEVERE:     at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
SEVERE:     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
SEVERE:     at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
SEVERE:     at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
SEVERE:     at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
SEVERE:     at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
SEVERE:     at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
SEVERE:     at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
SEVERE:     at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
SEVERE:     at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
SEVERE:     at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
SEVERE:     at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
SEVERE:     at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
SEVERE:     at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
SEVERE:     at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
SEVERE:     at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
SEVERE:     at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
SEVERE:     at java.lang.Thread.run(Thread.java:722)

Answer 1

您将数据错误地发送到 access_token URL。您需要发送 POST 请求数据中的字段。不作为 URL 的一部分。 URL 应仅为“https://api.instagram.com/oauth/access_token”，其余数据应采用 urlencode 形式作为 POST 中的数据。