public static void main(String[] args) throws IOException {
         FileInputStream fileInputStream = null;
         try {
             // 1.獲取文件指定的文件信息
             fileInputStream = new FileInputStream("D:\\softwore\\workspace\\springbootdemo\\node10-boot-mybatis\\src\\main\\resources\\test.txt");
            // 2.將數據讀到字節數組里
             byte[] buff = new byte[1024];
             int length = fileInputStream.read(buff);
             // 3.將字節數據轉換為字符串
             // 參數一：帶轉換的字節數組，參數二：起始位置  參數三：轉換的長度
             String info = new String(buff, 0, length);
             System.out.println(info);
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             // 4，關閉流操作
             if (fileInputStream != null)
             fileInputStream.close();
         }
}

public static void main(String[] args) throws IOException {
        InputStream inputStream = null;
        BufferedReader reader = null;
        StringBuilder content = new StringBuilder();
        try {
            inputStream = Test03.class.getClassLoader().getResourceAsStream("test.txt");
            if (Objects.nonNull(inputStream)) {
                reader = new BufferedReader(new InputStreamReader(inputStream));
            } else {
                throw new RuntimeException("test.txt not found");
            }
            String line = "";
            while ((line = reader.readLine()) != null) {
                content.append(line);
            }
            System.out.println(content.toString());
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            if (Objects.nonNull(inputStream)) {
                inputStream.close();
            }
            if (Objects.nonNull(reader)) {
                reader.close();
            }
        }
    }