读取json文件中文乱码

public class DownloadUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(DownloadUtil.class);

    public static String getJsonStringAt(String urlString) {
        StringBuffer strBuf = new StringBuffer();
        try {
            URL url = new URL(urlString);
            URLConnection conn = url.openConnection();
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line = null;
            while((line = reader.readLine()) != null) {
                strBuf.append(line + " ");
            }
            reader.close();
        } catch (MalformedURLException e) {
            LOGGER.error("[DownloadUtil.getJsonStringAt] 下载文件异常,exp:{}",e);
        } catch (IOException e) {
            LOGGER.error("[DownloadUtil.getJsonStringAt] 下载文件异常,exp:{}",e);
        }
        return strBuf.toString();
    }

    public static void main(String[] args) {
        String jsonStr = DownloadUtil.getJsonStringAt("https://blackfish-fb-private-sit.oss-cn-shanghai.aliyuncs.com/fb/t3/MDUzZTVkMTgtYWZmNC00NGE3LTg3YzgtMDZhMThlYzNkM2Zl.json");
        System.out.println(jsonStr);
    }
}

一开始读取远程的Json文件总是出现中文乱码，后来在创建InputStreamReader对象时指定了编码格式UTF-8，问题解决了，就是这一句：

new InputStreamReader(conn.getInputStream(), "UTF-8")