Java Json在android中发布特定格式的数据并获取响应

我需要以这种格式通过json url发布数据

{
"Authentication":   
{
  "Username": "testUser@123",
  "Password": "testPassword@123"
},
"RequestType": 4
}

---

并获取android中特定请求的响应。如何做到这一点，如果您有想法，请帮助我

尝试使用post方法将json发送到服务器

try {
            HttpClient httpClient = new DefaultHttpClient();
            JSONObject object = new JSONObject();
            object.put("Username", "testUser@123");
            object.put("Password", "testPassword@123");
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("Authentication", object);
            jsonObject.put("RequestType", 4);
            HttpPost postMethod = new HttpPost("your_url");
            postMethod.setEntity(new StringEntity(jsonObject.toString()));
            postMethod.setHeader("Accept", "application/json");
            postMethod.setHeader("Content-type", "application/json");
            HttpResponse response = httpClient.execute(postMethod);
            HttpEntity entity = response.getEntity();
            String response_value = EntityUtils.toString(entity).toString();
        } catch (Exception e) {
            e.printStackTrace();
        }

---

你是说扩展名为.json的url？非常感谢。它工作得很好。