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 servlet
try {
// Construct data
StringBuffer data = new StringBuffer();
// Send data
String 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 response
BufferedReader 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;
}