网络工具类

public class Net_utlis {
    public static String string(String urlString){
        try {
            URL url = new URL(urlString);
            //网络请求
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            //获取请求吗
            int responseCode = urlConnection.getResponseCode();
            if (responseCode==200){
                //写入流
                InputStream inputStream = urlConnection.getInputStream();
                //缓冲流
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                //拼接
                String a = "";
                String b = "";
                while ((a=reader.readLine())!=null){
                        b+=a;
                }
                return b;
            }

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }
}