android http数据通信 通过GET 请求获取数据

通过GET 请求获取数据
public static String sendGetRequest(String endpoint,String requestParameters) {Log.i("sendGetRequest", endpoint);String result = null;if (endpoint.startsWith("http://")) {// Send a GET request to the servlettry {// Construct dataStringBuffer data = new StringBuffer();// Send dataString urlStr = endpoint;if (requestParameters != null && requestParameters.length() > 0) {urlStr += "?" + requestParameters;}Log.i("urlStr", urlStr);URL url = new URL(urlStr);URLConnection conn = url.openConnection();// Get the responseBufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));StringBuffer sb = new StringBuffer();String line;while ((line = rd.readLine()) != null) {sb.append(line);}rd.close();result = sb.toString();} catch (Exception e) {e.printStackTrace();}}Log.i("sendGetRequest", result);return result;}比如再举个实际的例子，通过指定URL 的图片，获取图片数据，并转换成Android 的支持的图片格式，相关代码如下：// 显示网络上的图片public static Bitmap returnBitMap(String url) {Log.i("returnBitMap", "url=" + url);URL myFileUrl = null;Bitmap bitmap = null;try {myFileUrl = new URL(url);} catch (MalformedURLException e) {e.printStackTrace();}try {HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();conn.setDoInput(true);conn.connect();InputStream is = conn.getInputStream();bitmap = BitmapFactory.decodeStream(is);is.close();} catch (IOException e) {e.printStackTrace();}return bitmap;}