FileInputStream读取文本文件的全部内容

 String filePath ="C:/Users/xzw/Desktop/工作文档/12月/13号/sys.txt";
        try {
            FileInputStream fileInputStream = new FileInputStream(filePath);
            //fileInputStream.available()表示读取文件全部内容
            byte[] bytes = new byte[fileInputStream.available()];
            fileInputStream.read(bytes);
            String s = new String(bytes);
            fileInputStream.close();
           
            System.out.println(s);
        } catch (Exception e) {
            e.printStackTrace();
        }

年轻人加油，多写多理解，写多了就熟悉了，累计的多，慢慢的就有体系的概念了