使用Java从Instagram API获取oAuth令牌

我有一个名为Autentica的简单servlet，负责获取用于了解OAuth令牌的de代码参数。API返回到我的回调页面，因此运行名为callback的servlet。问题在于：当我构建URL以获取OAuth令牌时，会生成一个IOException，我不知道如何解决

有人能帮我吗？遵循servlet代码和控制台结果。太多了

1） 奥特提卡酒店

@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 = "XXXXXXXXXXX";
        String client_secret = "YYYYYYYYYYYY";
        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);
            URLConnection httpc = url.openConnection();
            httpc.setDoInput(true);
            httpc.connect();
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    httpc.getInputStream()));
            String strLine = "";
            String content = "";
            while ((strLine = in.readLine()) != null){
                 content = content+strLine;
            }
            in.close();
            return content;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

3） 控制台

当你获得一份工作时，这意味着：

405方法不允许

使用资源不支持的请求方法对资源发出请求；例如，在需要通过POST显示数据的表单上使用GET，或者在只读资源上使用PUT

您正在发送GET请求，但Instagram：

为了进行此交换，您只需将此代码以及一些应用程序标识参数发布到我们的access_令牌端点

要将

URLConnection

与Post一起使用，请选中。

作为您获得的权限，这意味着：

405方法不允许

使用资源不支持的请求方法对资源发出请求；例如，在需要通过POST显示数据的表单上使用GET，或者在只读资源上使用PUT

您正在发送GET请求，但Instagram：

为了进行此交换，您只需将此代码以及一些应用程序标识参数发布到我们的access_令牌端点

---

要在Post中使用

URLConnection

，请检查。

Hi@jan gerlinger，我不是网络编程专家，也许我在问一些愚蠢的问题。对不起。。。实际上，我按照你的建议去做，现在我得到了错误400（我认为是错误的请求）。下面是我的getContent方法的一部分<代码>URL URL=新URL（httpurl）；HttpURLConnection conn=（HttpURLConnection）url.openConnection（）；conn.setRequestMethod（“POST”）；BufferedReader in=新的BufferedReader（新的InputStreamReader（conn.getInputStream（））另一个问题。。。如果我只是在浏览器上复制并通过httpurl变量的URL，我会看到内容吗？因为我的浏览器中没有任何内容。当您在浏览器中键入URL时，您的浏览器会自动发送一个

GET

请求，并且您会收到相同的

错误405

（您可以在Firefox的web控制台中进行检查）。对于新的

错误400

请用更新的代码问一个新问题。好的，我会问。非常感谢。嗨@jan gerlinger，我不是网络编程专家，也许我在问一些愚蠢的问题。对不起。。。实际上，我按照你的建议去做，现在我得到了错误400（我认为是错误的请求）。下面是我的getContent方法的一部分<代码>URL URL=新URL（httpurl）；HttpURLConnection conn=（HttpURLConnection）url.openConnection（）；conn.setRequestMethod（“POST”）；BufferedReader in=新的BufferedReader（新的InputStreamReader（conn.getInputStream（））另一个问题。。。如果我只是在浏览器上复制并通过httpurl变量的URL，我会看到内容吗？因为我的浏览器中没有任何内容。当您在浏览器中键入URL时，您的浏览器会自动发送一个

GET

请求，并且您会收到相同的

错误405

（您可以在Firefox的web控制台中进行检查）。对于新的

错误400

，请用更新的代码问一个新问题。好的，我会的。非常感谢。您如何使用这些类？我正试图通过Javascript访问instagram，你如何使用这些类？我正试图用java访问instagram

SEVERE: java.io.IOException: Server returned HTTP response code: 405 for URL: https://api.instagram.com/oauth/access_token?client_id=XXXXXXXXXXX&client_secret=YYYYYYYYYYYY&grant_type=authorization_code&redirect_uri=http://localhost:8080/InstagramAPI/callback&code=aca1134c71944461b9db9417f4e2baa5
    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:62)
    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:62)
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)