OKhttp post 요청

// OkHttpClient 
    OkHttpClient client = new OkHttpClient();
// FormEncodingBuilder 
    FormEncodingBuilder builder = new FormEncodingBuilder();
    builder.add("loginName", "xxx").add("password", "xxx");
// FormEncodingBuilder Post 
    RequestBody body = builder.build();
// Post Request
    Request request = new Request.Builder().url(url).post(body).build();

    Call call = client.newCall(request);
    call.enqueue(new com.squareup.okhttp.Callback() {
        @Override
        public void onFailure(Request request, IOException e) {

        }

        @Override
        public void onResponse(Response response) throws IOException {
            if (response.isSuccessful()) {
                String result = response.body().string();
                Log.e("result",result);
            } else {
                throw new IOException("Unexpected code " + response);
            }
        }
    });