如何在Java，Android上对我的Web服务进行POST查询？

Question

I have code for POST query on Java

    ArrayList<HashMap<String, String>> books=SQLiteDbWrapper.getInstance().getAllBooks();
    JSONObject object=new JSONObject();
    object.put("key", KEY);

    JSONArray isbns=new JSONArray();
    for (HashMap<String, String> book:books) {
        isbns.put(book.get(SQLiteDbHelper.ISBN13_FIELD));
    }

    object.put("isbns", isbns);
    object.put("email", email);
    Log.e("log", object.toString());
    HttpClient client = new DefaultHttpClient();
    HttpPost request = new HttpPost(BASE_URL+SUBMIT_SCRIPT);

    request.setEntity(new ByteArrayEntity(
        object.toString().getBytes("UTF8")));
    HttpResponse response = client.execute(request);

I need to send JSON data into server; my web-service must get this data from $POST['json'] variable, but I don't know how can I put my JSONObject object into 'json' field for POST query? Please, help me

Answer 1

You must do as follows:

String jsonValue = object.toString();
String encoded = java.net.URLEncoder.encode(jsonValue, "UTF-8");

List<NameValuePair> formData = new ArrayList<NameValuePair>();
formData.add(new NameValuePair("json", encoded));

request.setHeader("Content-Type", "application/x-www-form-urlencoded");
request.setRequestBody(formData);

response = client.execute(request);

Answer 2

Your code looks OK. All I see is a missing content type in the HttpPost object.

request.setHeader("Content-Type", "application/json");