Paypal API call with HttpClient

PaypalExample.java

	private static String paypalApiUrl = "https://api-3t.sandbox.paypal.com/nvp"; // remove sandbox. for production environment
	private static NumberFormat paypalNumberFormat = new DecimalFormat("0.00", new DecimalFormatSymbols(Locale.US));
	
	public Map<String, String> paypalApi(Map<String, Object> params) throws ClientProtocolException, IOException {
		HttpClient client = httpClientBuilder.build();
		HttpPost post = new HttpPost(paypalApiUrl);
		List<NameValuePair> nvpParams = new ArrayList<NameValuePair>();
		for (Map.Entry<String, ?> e : params.entrySet()) {
			nvpParams.add(new BasicNameValuePair(e.getKey(), e.getValue() instanceof Number
					? paypalNumberFormat.format(e.getKey()) : e.getValue().toString()));
		}
		post.setEntity(new UrlEncodedFormEntity(nvpParams));
		HttpResponse response = client.execute(post);
		return parseResponse(response);
	}

	private String getResponseContent(HttpResponse response) throws IOException, IllegalStateException {
		InputStream is = response.getEntity().getContent();
		BufferedReader br = new BufferedReader(new InputStreamReader(is));
		String result = "";
		String line = null;
		while ((line = br.readLine()) != null) {
			result += line;
		}
		return result;
	}

	private Map<String, String> parseResponse(HttpResponse response) throws IllegalStateException, IOException {
		Map<String, String> map = new HashMap<String, String>();
		for (NameValuePair nvp : URLEncodedUtils.parse(getResponseContent(response), Charset.forName("UTF-8"))) {
			map.put(nvp.getName(), nvp.getValue());
		}
		return map;
	}