字节流转为字符串的工具类

//将字节流转为字符串
private String StreamToString(InputStream inputStream, String s) {
    try {
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream,s);
        //缓冲流读取
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        //字符串缓冲区
        StringBuilder builder = new StringBuilder();
        String string = null;
        while ((string = bufferedReader.readLine()) != null){
            builder.append(string);
        }
        return builder.toString();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}