Question

我想通过使用http POST方法向Google Vision API发送json对象。我使用以下代码：

URL url = new URL("https://vision.googleapis.com/v1/images:annotate?key=<API-KEY>"); 
HttpsURLConnection http = (HttpsURLConnection)url.openConnection();
http.setDoOutput(true);
http.setRequestMethod("POST"); 
http.setRequestProperty("Content-Type", "application/json"); 
http.connect();

DataOutputStream wr = new DataOutputStream(http.getOutputStream());
wr.writeBytes(request.toString());
Log.v("JSON",request.toString());
wr.flush();
wr.close();

我收到错误请求错误。需要帮助。我的json对象（请求）的格式如下：

{"imageContext":"",
 "requests":"
    {"image":
        {"content":"..."},
    "features":
        {"type":"WEB DETECTION"}
        {"maxResults":10}
    }
}

Answer 1

查看the documentation，features应该是这样的数组：

{
  "requests": [
    {
      "image": {
        "content": "..."
      },
      "features": [
        {
          "type": "WEB_DETECTION",
          "maxResults": 10
        }
      ]
    }
  ]
}

另见this page。

Answer 2

我正在构建我的json对象，如下所示：这里变量编码包含图像的64位编码字符串

JSONObject request = new JSONObject();

//image object
JSONObject i = new JSONObject();
i.put("content",encoded);

//feature object
JSONObject features = new JSONObject();
List<JSONObject> featureList = new ArrayList<>();
JSONObject f = new JSONObject();
f.put("type","WEB_DETECTION");
f.put("maxResults",10);
featureList.add(f);

 List<JSONObject> requestList = new ArrayList<>();
 JSONObject r = new JSONObject();
 r.put("image",i);
 r.put("features",featureList);
 requestList.add(r);

 //final json object
 request.put("imageContext","");
 request.put("requests",requestList);

向Google Vision API发送请求

2 个答案: