How to retrieve JSON from HTTP POST request in Java?

Question

So I've created a basic REST API in PHP that returns the following:

$result = array(
    "var" => 'testvalue',
);

sendResponse(200, json_encode($result));

How would I get this testvalue from the JSON using a HTTP POST request in Java?

I'm using the recommended answer from here currently: Sending HTTP POST Request In Java

But it dosn't show how to convert it from this stage:

HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
InputStream instream = entity.getContent();

To a Java object.

So pretty much how to convert from JSON to a Java object.

Any ideas?

What do you mean by "But it dosn't show how to convert it from JSON to a usable format in Java"? Can you include example of results you get and what you would like to achieve? — Pshemo
– Pshemo, Commented Oct 1, 2014 at 17:25
So you are asking how to convert JSON string to Java objects ? — BojanT
– BojanT, Commented Oct 1, 2014 at 17:26

Bob · Accepted Answer · 2014-10-01 18:19:02Z

1

If you do not need to read large data, you can use something like:

JSONObject json = new JSONObject(EntityUtils.toString(response.getEntity()));
String var = json.getString("var"):

You can use it on Android too, the library is org.json.JSONObject.

answered Oct 1, 2014 at 17:40

Bob

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3 Comments

It could be nice to mention from which library/package JSONObject comes from because it is not standard Java class.

@Pshemo org.json.JSONObject

It would be nice if you put that information with appropriate link to project site or jars (and/or maven dependency) to your answer.