Java 文本文件读取，使用BufferedReader.readLine()，换行符不被保留，保留换行符使用InputStream.read()

    //读取文件
    public static String readFileContent(InputStream inputStream){
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
        BufferedReader reader = null;
        StringBuffer sbf = new StringBuffer();
        try {
            byte[] inputbyte=new byte[inputStream.available()];

            //循环读取
            while (inputStream.read(inputbyte)!=-1) {
                //将byte数组中的内容转换为String内容字符串输出
                String s = new String(inputbyte, 0, inputbyte.length);
                System.out.println(s);
                sbf.append(s);
            }

//            reader = new BufferedReader(inputStreamReader);
//            String tempStr;
//
//            while ((tempStr = reader.readLine()) != null) {
//                sbf.append(tempStr);
//            }
//            reader.close();
            return sbf.toString();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
        return sbf.toString();
    }