Android中用于内容类型的JSON对象的HTTP POST请求问题

Question

The following is my code for a HTTP POST request in an Android device running Android 4.1.2. I have question:

• This code works perfectly on a Samsung device whereas it is giving "Content-type is not application/json" on an HTC device.

  public static String POST(String url, JSONObject obj) { Log.i("JSONPOSTBEGIN", "Beginning of JSON POST"); InputStream inputStream = null; String result = "";

   HttpClient httpclient = new DefaultHttpClient(); try { HttpPost post = new HttpPost(url); post.setHeader("Content-type", "application/json"); post.setHeader("Accept", "application/json"); StringEntity se = new StringEntity(obj.toString()); se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json")); post.setEntity(se); HttpResponse httpResponse = mHhttpclient.execute(post); // receive response as inputStream inputStream = httpResponse.getEntity().getContent(); // convert inputstream to string if(inputStream != null) { result = convertInputStreamToString(inputStream); } else result = "Did not work!"; } catch (Exception e) { Log.d("InputStream", e.getLocalizedMessage()); } Log.i("JSONPOSTEND", "End of JSON data post methos..."); return result; 

  }

Answer 1

For it to work on HTC and all devices, you must do this

private static HttpEntity getHttpEntity(String stringEntity) {
    HttpEntity entity = null;
    try {
        entity = new StringEntity(stringEntity, HTTP.UTF_8);
        ((StringEntity) entity).setContentType("application/json;charset=UTF-8");
        ((StringEntity) entity).setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json;charset=UTF-8"));

    } catch (Exception e) {
        Log.d("error creating entity: " + stringEntity);
    }
    return entity;
}

Answer 2

Note that headers are likely being set by this

new HttpPost(url);

and that before you add new headers like for "content-type" you may have to call remove header (Content-type) first....

you need logging to figure it all out.for more on that see accepted ans here

and get WIRE & HEADER logging up in your test environment