使用HttpURLConnection执行POST请求时获取JSON响应

我使用以下代码在REST API上执行POST请求。一切都很顺利。我不能做的是,POST成功后,API在body中返回响应JSON和头,这个JSON有我需要的信息。我无法获得JSON响应。

我需要这个响应,因为这个响应包括DB生成的ID。我可以在使用firefox的REST客户端插件时看到响应。需要在Java中实现相同的功能。

    String json = "{\"name\": \"Test by JSON 1\",\"description\": \"Test by JSON 1\",\"fields\": {\"field\": []},\"typeDefinitionId\": \"23\",\"primaryParentId\": \"26982\"}";
    String url = "http://serv23/api/contents";      
    URL obj = new URL(url);

    HttpURLConnection con = (HttpURLConnection) obj.openConnection();

    //Setting the Request Method header as POST
    con.setRequestMethod("POST");

    //Prepairing credentials
    String cred= "user123:p@ssw0rd";
    byte[] encoded = Base64.encodeBase64(cred.getBytes());           
    String credentials = new String(encoded);

    //Setting the Authorization Header as 'Basic' with the given credentials
    con.setRequestProperty  ("Authorization", "Basic " + credentials);

    //Setting the Content Type Header as application/json
    con.setRequestProperty("Content-Type", "application/json");

    //Overriding the HTTP method as as mentioned in documentation   
    con.setRequestProperty("X-HTTP-Method-Override", "POST");

    con.setDoOutput(true);

    JSONObject jsonObject = (JSONObject)new JSONParser().parse(json);

    OutputStream os = con.getOutputStream();
    os.write(jsonObject.toJSONString().getBytes());

    os.flush();
    WriteLine( con.getResponseMessage() );
    int responseCode = con.getResponseCode();