请求网络接口的工具类

private static String tag = "getNetJson";

public static String getNetJson(String urlString) {
    try {
        //url对象封装接口字符串
        URL url = new URL(urlString);
        //用url打开连接, 返回值我们用HttpURLConnection
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setConnectTimeout(8000);//设置链接超时时间
        int responseCode = urlConnection.getResponseCode(); //获取状态码
        if (responseCode == 200) {
            InputStream inputStream = urlConnection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            //可拼接的字符串
            StringBuilder stringBuilder = new StringBuilder();
            String temp =null;
            while ((temp = bufferedReader.readLine()) != null) {
                stringBuilder.append(temp);

            }
            String jsonString = stringBuilder.toString();
            return jsonString;
        } else {
        }


    } catch (MalformedURLException e) {
        e.printStackTrace();
        Log.e(tag, "getNetJson: " + e.toString());
    } catch (IOException e) {
        e.printStackTrace();
        Log.e(tag, "getNetJson: " + e.toString());
    }

    return "";
}

/**
 * 获取网络图片
 *
 * @param urlString
 * @return
 */
public static Bitmap getNetBitmap(String urlString) {
    try {
        URL url = new URL(urlString);
        HttpURLConnection httpurlConnection = (HttpURLConnection) url.openConnection();
        httpurlConnection.setConnectTimeout(8000);//设置链接超时时间
        int responseCode = httpurlConnection.getResponseCode();

        if (responseCode == 200) {
            InputStream inputStream = httpurlConnection.getInputStream();
            //BitmapFactory:  android提供好的加工图片的工具类,
            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
            return bitmap;
        } else {
            //do nothing
        }
    } catch (MalformedURLException e) {
        e.printStackTrace();
        Log.e(tag, "getNetBitmap: " + e.toString());
    } catch (IOException e) {
        e.printStackTrace();
        Log.e(tag, "getNetBitmap: " + e.toString());
    }
    return null;
}