Android JSON connection

gistfile1.java

	/**
	 * @param hostNameOrIP
	 *            : the host name or IP<br/>
	 *            ex: google.com
	 * @param webService
	 *            : the web service name<br/>
	 *            ex: testWCF
	 * @param classOrEndPoint
	 *            : the file or end point<br/>
	 *            ex: testWCF.svc
	 * @param method
	 *            : the method being called<br/>
	 *            ex: getUserData
	 * @param httpMethod
	 *            : the connection method (GET, POST, PUT, DELETE ...etc)
	 * @param postData
	 *            : the message body (parameters or arguments)
	 * @return
	 */
	public static String connectJSON(final String hostNameOrIP,
			final String webService, final String classOrEndPoint,
			final String method, final String httpMethod, final byte[] postData) {
		final String url = "http://" + hostNameOrIP + "/" + webService + "/"
				+ classOrEndPoint + "/" + method;

		final StringBuffer text = new StringBuffer();
		HttpURLConnection conn = null;
		OutputStream out = null;
		InputStreamReader in = null;
		BufferedReader buff = null;
		try {
			final URL page = new URL(url);
			conn = (HttpURLConnection) page.openConnection();
			conn.addRequestProperty("Accept", "application/json");
			conn.addRequestProperty("Content-Type", "application/json");
			if ("GET".equals(httpMethod)) {
				conn.connect();
			} else {
				conn.setDoInput(true);
				conn.setDoOutput(true);
				conn.setUseCaches(false);
				conn.setRequestMethod(httpMethod);
				out = conn.getOutputStream();
				out.write(postData);
				out.flush();
				out.close();
			}
			final int responseCode = conn.getResponseCode();
			if (responseCode == 401 || responseCode == 403) {
				// Authorization Error
				Log.e(Constants.TAG, "Authorization error in " + method + "("
						+ postData.toString() + ")");
				// throw new Exception("Authorization Error in " + method + "("
				// + postDataBuilder.toString() + ")");
				return null;
			}
			if (responseCode == 404) {
				// Authorization Error
				Log.e(Constants.TAG, "Not found error in " + method + "("
						+ postData.toString() + ")");
				// throw new Exception("Authorization Error in " + method + "("
				// + postDataBuilder.toString() + ")");
				return null;
			}

			if (responseCode >= 500 && responseCode <= 504) {
				// Server Error
				Log.e(Constants.TAG, "Internal server error in " + method + "("
						+ postData.toString() + ")");
				// throw new Exception("Internal Server Error in " + method +
				// "("
				// + postDataBuilder.toString() + ")");
				return null;
			}
			in = new InputStreamReader((InputStream) conn.getContent());
			buff = new BufferedReader(in);
			String line;
			while (null != (line = buff.readLine()) && !"null".equals(line)) {
				text.append(line + "\n");
			}
			buff.close();
			buff = null;
			in.close();
			in = null;
			conn.disconnect();
			conn = null;
		} catch (final Exception e) {
			Log.e(Constants.TAG,
					"Exception while getting " + method + " from " + webService
							+ "/" + classOrEndPoint + " with parameters: "
							+ postData.toString() + ", exception: "
							+ e.toString() + ", cause: " + e.getCause()
							+ ", message: " + e.getMessage());
			MyMethods.stackTracePrint(e.getStackTrace(), method);
			return null;
		} finally {
			if (null != out) {
				try {
					out.close();
				} catch (final IOException e1) {
				}
				out = null;
			}
			if (null != buff) {
				try {
					buff.close();
				} catch (final IOException e1) {
				}
				buff = null;
			}
			if (null != in) {
				try {
					in.close();
				} catch (final IOException e1) {
				}
				in = null;
			}
			if (null != conn) {
				conn.disconnect();
				conn = null;
			}
		}
		if (text.length() > 0 && Communications.checkText(text.toString())) {
			final String temp = Communications.getDataFromXML(text.toString());
			Log.i(Constants.TAG,
					"Success in " + method + "(" + postData.toString() + ") = "
							+ temp);
			return temp;
		}
		Log.w(Constants.TAG, "Warning: " + method + "(" + postData.toString()
				+ "), text = " + text.toString());
		return null;
	}