http 重要代码

 URL restServiceURL = new URL(sb.toString());// 最终url
System.out.println("finalUrl1----" + sb.toString());
HttpURLConnection httpConnection = (HttpURLConnection) restServiceURL.openConnection();
httpConnection.setRequestMethod("GET");
httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
if (httpConnection.getResponseCode() != 200) {
throw new RuntimeException(
"HTTP GET Request Failed with Error code : " + httpConnection.getResponseCode());
}
BufferedReader responseBuffer = new BufferedReader(
new InputStreamReader((httpConnection.getInputStream())));
String output;
System.out.println("Output from Server:  \n");
while ((output = responseBuffer.readLine()) != null) {
result_count = output;
System.out.println(output);
}