Java方法读取文件内容

一.针对文件内容的读取,在平时的工作中想必是避免不了的操作,现在我将自己如何用java方法读取文件中内容总结如下:废话不多说,直接上代码:

方法一:

 1 public static void main(String[] args) throws IOException {
 2         FileInputStream fileInputStream = null;
 3         try {
 4             // 1.获取文件指定的文件信息
 5             fileInputStream = new FileInputStream("D:\\softwore\\workspace\\springbootdemo\\node10-boot-mybatis\\src\\main\\resources\\test.txt");
 6             // 2.将数据读到字节数组里
 7             byte[] buff = new byte[1024];
 8             int length = fileInputStream.read(buff);
 9             // 3.将字节数据转换为字符串
10             // 参数一:带转换的字节数组,参数二:起始位置  参数三:转换的长度
11             String info = new String(buff, 0, length);
12             System.out.println(info);
13         } catch (IOException e) {
14             e.printStackTrace();
15         } finally {
16             // 4,关闭流操作
17             if (fileInputStream != null)
18             fileInputStream.close();
19         }

1.文件存放位置

2.结果如下:

 方法二:(此方法是读取resource目录下对应文件名的文件内容)

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();
            }
        }
    }

1.输出结果如下:

posted @ 2022-03-12 16:00  [奋斗]  阅读(5036)  评论(0编辑  收藏  举报