java - 将curl命令转换为java http客户端代码以获取数据

Question

在获取授权码后，我使用下面的curl命令从instagram api获取访问 token 。

curl \-F 'client_id=cf07d1a2c69940e59420b6db4c936f4a' \
-F 'client_secret=fb0a975ca2024a1592459308df5ead47' \
-F 'grant_type=authorization_code' \
-F 'redirect_uri=http://localhost:8080/Insta_SMI_M1/accessToken/' \
-F 'code=fcf66e5f09bf43a18ab15e5f1e0ae75f' 
\https://api.instagram.com/oauth/access_token/

输出:

{"access_token": "5351945621.cf07d1a.1d35647e22f24ed0885f65545f3f1b0b", "user": {"id": "5351945621", "username": "abhaykumar", "profile_picture": "https://scontent-amt2-1.cdninstagram.com/t51.2885-19/11906329_960233084022564_1448528159_a.jpg", "full_name": "Quantum Four", "bio"}

curl 网址:

https://api.instagram.com/oauth/access_token?client_id=cf07d1a2c69940e59420b6db4c936f4a&client_secret=fb0a975ca2024a1592459308df5ead47&grant_type=authorization_code&redirect_uri=http://localhost:8080/Insta_SMI_M1/auth&code=2c5d97c6d6454b8592816d7d39efb935

在 postman 或浏览器中使用时，上述网址既不给出任何错误也不显示输出(其空行)。

下面是相同的代码。

 @RequestMapping(value="/auth", method=RequestMethod.GET)
 public String getAuthCode(HttpServletRequest request, HttpServletResponse response)
 {   
        String code = request.getParameter("code");
        System.out.println("code is: "+ code);


        String url = "https://api.instagram.com/oauth/access_token?"
                + "client_id=" + Constants.CLIENT_ID
                + "&client_secret=" + Constants.CLIENT_SECRET
                + "&grant_type=authorization_code"
                + "&redirect_uri=" + Constants.REDIRECT_URI_AUTH
                + "&code="+code;

        System.out.println("Access Token URL: "+ url);
         StringBuffer result = null;
        try {
            System.out.println("1");
            @SuppressWarnings({ "resource", "deprecation" })
            HttpClient client = new DefaultHttpClient();
             HttpGet request1 = new HttpGet(url);
            System.out.println("2");

             HttpResponse response1 = client.execute(request1);
             BufferedReader rd = new BufferedReader(
                     new InputStreamReader(response1.getEntity().getContent()));
                System.out.println("3");

             result = new StringBuffer();
             String line = "";
             while ((line = rd.readLine()) != null) {
                    System.out.println("line " + line);
                 result.append(line);
                    System.out.println("3");

             }
        } catch (UnsupportedOperationException | IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }   
        System.out.println(result.toString()); 
        return result.toString();    
 }

有人可以帮我解决这个问题吗？谢谢

Answer 1

curl 正在执行 POST 请求，而您正在执行来自 java.util.Drawing 的 GET 请求。按照此示例了解如何制作 POST request using java (使用http客户端)。您可以考虑使用以下代码来设置参数:

params.add(new BasicNameValuePair("client_id", "cf07d1a2c69940e59420b6db4c936f4a"));
params.add(new BasicNameValuePair("client_secret", "fb0a975ca2024a1592459308df5ead47"));