通过Url读取文件的内容

URL url = new URL(path);//path为url路径
HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 利用HttpURLConnection对象,我们可以从网络中获取网页数据.
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream(); // 得到网络返回的输入流

　InputStreamReader isr = new InputStreamReader(is, "utf-8"); 
　BufferedReader br = new BufferedReader(isr);
　String s = null;
　while ((s = br.readLine()) != null) {// 使用readLine方法，一次读一行
　}
　br.close();