根据URL获取HTTP Response的整个结果字符串

getResponse.java

/*
** 不同的方式获取结果 [InputStream -> String] ： http://stackoverflow.com/questions/309424/read-convert-an-inputstream-to-a-string
*/
public static String getResponseFromHttpUrl(URL url) throws IOException {
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        try {
            InputStream in = urlConnection.getInputStream();

            Scanner scanner = new Scanner(in);
            scanner.useDelimiter("\\A");

            boolean hasInput = scanner.hasNext();
            if (hasInput) {
                return scanner.next();
            } else {
                return null;
            }
        } finally {
            urlConnection.disconnect();
        }
    }