How:What:Java 中实现readLine()(逐行读取数据)的一个实例

最新推荐文章于 2025-05-18 16:01:04 发布

S-A-M

最新推荐文章于 2025-05-18 16:01:04 发布

阅读量8.8k

点赞数 1

CC 4.0 BY-SA版权

分类专栏： Java 文章标签： java file string character stream input

本文链接：https://blog.youkuaiyun.com/heiantianshi1/article/details/7386438

Java 专栏收录该内容

13 篇文章

订阅专栏

本文介绍了一个使用Java进行文件读取的实例，详细解释了涉及的关键类如FileInputStream、BufferedReader及InputStreamReader的作用与使用方法，并说明了readLine()方法如何逐行读取文件。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

实例如下：

FileInputStream f=new FileInputStream("myEncodeblocks.txt");
                BufferedReader tmp_reader=new BufferedReader(new InputStreamReader(f));
                String tmp_string=tmp_reader.readLine();

实现该实例几个要素：

1.文件(本例中是myEncodeblocks.txt，存储在当前目录，即可执行文件class所在目录)

2.BufferedReader实例，构造函数依赖InputStreamReader实例

3.InputStreamReader实例

An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset.

该例中用的构造函数：InputStreamReader(InputStream in)
Create an InputStreamReader that uses the default charset.

4.FileInputStream实例

A FileInputStream obtains input bytes from a file in a file system. What files are available depends on the host environment.

本实例使用的构造函数：

FileInputStream(String name)
Creates a FileInputStream by opening a connection to an actual file, the file named by the path name name in the file system.

一般我们从键盘输入字符流，而FileInputStream从文件系统中的文件中获取字符流

5.readLine()

该方法属于BufferedReader,每次会自动从下行开始读取，遇到“\n”或“\r”则改行结束

Read a line of text. A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed.

Returns:

A String containing the contents of the line, not including any line-termination characters, or null if the end of the stream has been reached