Fetch JSON property from HttpResponse object in Apache HttpClient

Question

I'm using Apache HttpClient 4.2 and just need to fetch the title property from the JSON response below.

Would I need to use the EntityUtils.toString() method for this?

Code

DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost postRequest = new HttpPost(MAILCHIMP_API_URL);

postRequest.setHeader("Content-Type", "application/json");
postRequest.setHeader("Authorization", "Basic " + MAILCHIMP_API_KEY_BASE64);

StringEntity entity = new StringEntity(json.toString(), "UTF8");
postRequest.setEntity(entity);

HttpResponse response = httpClient.execute(postRequest);

// Closes the connection
EntityUtils.consume(response.getEntity());

JSON Response

{
  "type": "http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/",
  "title": "Member Exists",
  "status": 400,
  "detail": "[email protected] is already a list member. Use PUT to insert or update list members.",
  "instance": ""
}

This may help.

Simon Sadetsky
– Simon Sadetsky

2017-08-17 19:27:49 +00:00
Commented Aug 17, 2017 at 19:27 — Simon Sadetsky
– Simon Sadetsky, Commented Aug 17, 2017 at 19:27

Volodymyr Masliy · Accepted Answer · 2017-08-17 19:32:13Z

1

Try this (jackson2 lib):

TypeReference<Map> mapType = new TypeReference<Map>() {};
ObjectMapper mapper = new ObjectMapper();
Map<String, String> responseJson = 
mapper.readValue(response.readEntity(String.class), mapType);
String typeValue = responseJson.get("type");

Probably you may want to create only one instance of mapper and mapType. But, I would prefer to create a java class which will represent your json and use

mapper.readValue(response.readEntity(String.class), YourType.class)

answered Aug 17, 2017 at 19:32

Volodymyr Masliy

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Comments

Muhammad Dyas Yaskur · Accepted Answer · 2020-01-04 17:37:04Z

0

You can use http-request built on apache http api. Documentation here.

private static final HttpRequest<Map<String, Object>> HTTP_REQUEST =
    HttpRequestBuilder.createPost(MAILCHIMP_API_URL, new TypeReference<Map<String, Object>>() {
    })
    .addContentType(ContentType.APPLICATION_JSON)
    .addDefaultHeader("Authorization", "Basic " + MAILCHIMP_API_KEY_BASE64)
    .build();
public void method() {
    String title = HTTP_REQUEST.executeWithBody(json.toString()).get().get("title");
}

edited Jan 4, 2020 at 17:37

Muhammad Dyas Yaskur

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answered Sep 10, 2017 at 15:11

Beno

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