Receive data from a webservice using REST API

Question

I need to get specific data from this API http://countryapi.gear.host/v1/Country/getCountries?pName=Australia, convert it to String and write out on the console. I want to get data only for Australia. How can I get data in String format only for Name and Alpha2Code like this: Australia, AU? I was trying to use EntityUtils.toString(response) but it doesn't work.

This is my code:

public class Client {

public static void main(String[] args) throws ClientProtocolException, IOException {

    HttpClient client = new DefaultHttpClient();
    HttpGet request = new HttpGet("http://countryapi.gear.host/v1/Country/getCountries?pName=Australia");
    request.addHeader("accept", "application/json");
    HttpResponse response = client.execute(request);
    HttpEntity entity = response.getEntity();
    InputStream stream = entity.getContent();
    BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
    String line = reader.readLine();
    System.out.println(line);
}
}

The code actually return JSON for Australia, like this:

enter image description here

If I am understanding correctly, service is returning a json response and you need to print that response as string. You can simply parse the json response and print the required key/value of json response. — Rahul, Nov 30 '17 at 19:37
yes, I need to print that json response as String, only for two parameters: Name and alpha2Code. How can I do this? — Viola, Nov 30 '17 at 19:39

score 0 · Answer 1 · answered Nov 30 '17 at 19:47

You can use java api for json parsing. I am just writing a sample code. YOu can explore json parsing api more on below URL: http://www.oracle.com/technetwork/articles/java/json-1973242.html

JsonObject obj = rdr.readObject();
JsonArray results = obj.getJsonArray("data");
for (JsonObject result : results.getValuesAs(JsonObject.class)) {
    System.out.print(result.getJsonObject("name").getString("name"));
    System.out.print(": ");
    System.out.println(result.getString("message", ""));
    System.out.println("-----------");
 }

score 0 · Accepted Answer · answered Nov 30 '17 at 19:49

0

Try something like this:

Gson gson = new Gson();
JsonObject result = gson.fromJson(line, JsonObject.class);
JsonArray response = result.getAsJsonArray("Response");
Country country = gson.fromJson(response, Country.class);

answered Nov 30 '17 at 19:49

Leonardo

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I don't know how to use this. I don't have such classes as Gson, JsonObject, JsonArray. – Viola Nov 30 '17 at 20:53
If you're using maven, check this out: https://mvnrepository.com/artifact/com.google.code.gson/gson/2.8.2 – Leonardo Nov 30 '17 at 23:22

Receive data from a webservice using REST API

2 Answers2