字节流转换

public  String inputstreamToString(InputStream stream){
        StringBuilder builder=new StringBuilder();

        try {
            BufferedReader reader=new BufferedReader(new InputStreamReader(stream));
            String str;
            while ((str=reader.readLine())!=null){
                builder.append(str);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        return  builder.toString();

    }