How to parse JSON results from Unirest call

StackOverflow https://stackoverflow.com/questions/23630681

質問

I'm using the Unirest library to retrieve JSON from a Mashape API. I have the call working using the following code:

HttpResponse<JsonNode> request = Unirest.get(URL)
  .header("X-Mashape-Authorization", MASHAPE_AUTH)
  .asJson();

This returns my JSON in the form of HttpResponse<JsonNode>, which I am unfamiliar with.

From reading the limited documentation, It seems that I have to call getBody() on the response object in order to get a JsonNode object back. I still have no idea what to do with the JsonNode object however.

What is the best way to begin to parse this data?

Edit: In case it helps with giving examples, the JSON I want to parse looks like this:

{
  "success": "1",
  "error_number": "",
  "error_message": "",
  "results": [
    {
      "name": "name1",
      "formatedName": "Name 1"
    },
    {
      "name": "testtesttest",
      "formatedName": "Test Test Test"
    },
    {
      "name": "nametest2",
      "formatedName": "Name Test 2"
    },
    {
      "name": "nametest3",
      "formatedName": "Name Test 3"
    }
  ]
}
役に立ちましたか？

解決

Was trying to figure this out today for myself. The source code is probably the only documentation you're going to get. Here's the tl;dr

// the request from your question
HttpResponse<JsonNode> request = Unirest.get(URL)
  .header("X-Mashape-Authorization", MASHAPE_AUTH)
  .asJson();

// retrieve the parsed JSONObject from the response
JSONObject myObj = request.getBody().getObject();

// extract fields from the object
String msg = myObj.getString("error_message");
JSONArray results = myObj.getJSONArray();

Here's some more explanation of the spelunking I did:

From the HttpResponse class we can see that getBody() is going to return the instance variable body, which gets assigned on line 92 as:

this.body = (T) new JsonNode(jsonString)

So then we need to look at the JsonNode class. The constructor takes a string representing the JSON to be parsed and attempts to create either a JSONObject or a JSONArray. Those objects come from org.json which is well documented, thankfully.

他のヒント

As the response is easily retrieved as a String, you can use any JSON library you want for deserialzion if you don't want to walk through the JSON manually. I personally am partial to Google's GSON and its ability to easily map your JSON response to an object that you create to match.

HttpRequest request = Unirest.get(/*your request URI*/)
                .headers(/*if needed*/)
                .queryString(/*if needed*/);

HttpResponse<JsonNode> jsonResponse = request.asJson();
Gson gson = new Gson();
String responseJSONString = jsonResponse.getBody().toString();
MyResponseObject myObject = gson.fromJson(responseJSONString, String.class);

In a JSON string , there are two symbols that guide you through parsing :

{ - indicates a JSONObject

[ - indicates a JSONArray

When parsing a json string, you should go through this items iteratively. To understand how many JsonObjects and JsonArrays you have in your string , and from which you should start parsing, use a json-visualizer tool like this website. for exampl for your string the structure is like this :
enter image description here

As you see, the root object is a JSONObject which consists of an JSONArray with three jsonOnjects. To parse such a structure you can use :

JSONObject jsonobj = new JSONObject(jsonstring);

String result = jsonObject.getString("success");
String error_number = jsonObject.getString("error_number");    
String error_message = jsonObject.getString("error_message"); 

JSON Array jsonarray = jsonobj.getJSONArray();

String[] names = new String[jsonArray.length()];    
String[] formattedNames = new String[jsonArray.length()];  

for(int i=0;i<jsonArray.length();i++)
{
    JSONObject jsonObject = jsonArray.getJSONObject(i);

    names [i] = jsonObject.getString("name");
    formattedNames [i] = jsonObject.getString("formattedName");
  }

There is a Serialization feature in Unirest (probably came out after the answers in 2015 and 2014). With the current version 1.4.9, you can use the handy asObject(Class) and body(Object) methods. Here is an example of deserializing AWS CloudSearch responses. 

import java.util.Arrays;

import org.apache.http.HttpStatus;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.ObjectMapper;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;

public class UnirestExample {
    public class Item {
        private String full4kurl;
        private String previewurl;
        private String description;

        @Override
        public String toString() {
            return "{full4kurl:" + full4kurl + ", previewurl:" + previewurl
                    + ", description:" + description + "}";
        }
    }

    public class Hit {
        private String id;
        private Item fields;

        @Override
        public String toString() {
            return "{id:" + id + ", fields:" + fields + "}";
        }
    }

    public class Hits {
        private int found;
        private int start;
        private Hit[] hit;

        @Override
        public String toString() {
            return "{found:" + found + ", start:" + start + ", hit:"
                    + Arrays.toString(hit) + "}";
        }
    }

    public class CloudSearchResult {
        private Hits hits;

        @Override
        public String toString() {
            return "{hits:" + hits + "}";
        }
    }

    public static final String END_POINT = "AWS CloudSearch URL";

    static {
        Unirest.setTimeouts(1000, 5000);

        Unirest.setObjectMapper(new ObjectMapper() {
            private Gson gson = new GsonBuilder().disableHtmlEscaping()
                    .create();

            @Override
            public <T> T readValue(String value, Class<T> valueType) {
                return gson.fromJson(value, valueType);
            }

            @Override
            public String writeValue(Object value) {
                return gson.toJson(value);
            }
        });
    }

    public static void main(String[] args) throws UnirestException {
        HttpResponse<CloudSearchResult> response = Unirest.post(END_POINT)
                .header("Header", "header").body("body")
                .asObject(CloudSearchResult.class);
        if (response.getStatus() == HttpStatus.SC_OK) {
            CloudSearchResult body = response.getBody();
            System.out.println(body);
        } else {
            throw new RuntimeException("Fail to invoke URL ");
        }
    }
}

You can retrieve the body of JsonNode and then convert the JsonNode to JSONObject to access the values. In order to access the results, you can convert it to JSONArray.

import org.json.*;
HttpResponse<JsonNode> request = Unirest.get(URL).header("X-Mashape 
Authorization", MASHAPE_AUTH).asJson();
JSONObject responsejson = request.getBody().getObject();
JSONArray results = responsejson.getJSONArray("results");

Then you can iterate over each JSONObject in results. For example to get first object in results

JSONObject value = results.getJSONObject(0);

This should work as it worked for me

System.out.println(request.getBody().getObject().toString(2));

sample code

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.JsonNode;
import com.mashape.unirest.http.Unirest;

public class UnirestClient{
public void getQuestions() throws Exception {
HttpResponse<JsonNode> stack= Unirest.get("https://api.stackexchange.com/2.2/questions").
    header("accept",  "application/json").
    queryString("order","desc").
    queryString("sort", "creation").
    queryString("filter", "default").
    queryString("site", "stackoverflow").
    asJson();
System.out.println(stack.getBody().getObject().toString(2));
 }

public static void main(String args[]) throws Exception {
JavaHTTPAPIClient client = new JavaHTTPAPIClient();
client.getQuestionsUsingUnirest();
 }
}

Response

    {
      "quota_max": 300,
      "items": [
        {
          "creation_date": 1477998742,
          "tags": [
            "javascript",
            "spring",
            "sockjs",
            "spring-js",
            "sockjs-tornado"
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            "accept_rate": 71,
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            "link": "http://stackoverflow.com/users/5288347/sviatlana",
            "reputation": 109,
            "user_id": 5288347
          },
          "last_activity_date": 1477998742,
          "question_id": 40358911,
          "view_count": 2,
          "is_answered": false
        },
        {
          "creation_date": 1477998741,
          "tags": [
            "php",
            "html",
            "email",
            "magento",
            "static-block"
          ],
          "title": "Creating a magento email template: custom static block not working",
          "link": "http://stackoverflow.com/questions/40358910/creating-a-magento-email-template-custom-static-block-not-working",
          "score": 0,
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          "owner": {
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        },
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          "creation_date": 1477998733,
          "tags": [
            "vba",
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            "macros",
            "numbers",
            "powerpoint"
          ],
          "title": "Random number Powerpoint as slide change",
          "link": "http://stackoverflow.com/questions/40358908/random-number-powerpoint-as-slide-change",
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          "is_answered": false
        },
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          "tags": [
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          "title": "page redirection happening when Go button is pressed on a textbox (jquery/cordova)",
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// try this way,hope this will help you...

        String respone  = "{\n" +
               "  \"success\": \"1\",\n" +
               "  \"error_number\": \"\",\n" +
               "  \"error_message\": \"\",\n" +
               "  \"results\": [\n" +
               "    {\n" +
               "      \"name\": \"name1\",\n" +
               "      \"formatedName\": \"Name 1\"\n" +
               "    },\n" +
               "    {\n" +
               "      \"name\": \"testtesttest\",\n" +
               "      \"formatedName\": \"Test Test Test\"\n" +
               "    },\n" +
               "    {\n" +
               "      \"name\": \"nametest2\",\n" +
               "      \"formatedName\": \"Name Test 2\"\n" +
               "    },\n" +
               "    {\n" +
               "      \"name\": \"nametest3\",\n" +
               "      \"formatedName\": \"Name Test 3\"\n" +
               "    }\n" +
               "  ]\n" +
               "}";

        try{

            JSONObject responeJson = new JSONObject(respone);
            if(responeJson.getString("success").equals("1")){
                JSONArray jsonArray = responeJson.getJSONArray("results");

                for (int i=0;i<jsonArray.length();i++){
                    System.out.println("Name : "+jsonArray.getJSONObject(i).getString("name"));
                    System.out.println("FormatedName : "+jsonArray.getJSONObject(i).getString("formatedName"));
                }
            }else{
                Toast.makeText(this,responeJson.getString("error_message"),Toast.LENGTH_SHORT).show();
            }
        }catch (Throwable e){
            e.printStackTrace();
        }
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