如何从文本文件Java中读取单个单词（或行）？ [英] How to read a single word (or line) from a text file Java?

问题描述

就像标题所说，我试图编写一个程序，可以从文本文件中读取单个单词并将它们存储到 String 变量中。我知道如何使用 FileReader 或 FileInputStream 来读取单个 char 但是我正在尝试这个不会工作。一旦我输入单词，我试图将这些与我的程序中的其他String变量进行比较，使用.equals，这样我最好能够导入为Strings。我也可以将文本文件中的整行输入为String，在这种情况下，我只在文件的每一行放一个单词。如何从文本文件中输入单词并将其存储到String变量中？

Like the title says, im trying to write a program that can read individual words from a text file and store them to String variables. I know how to use a FileReader or FileInputStream to read a single char but for what I'm trying to this wont work. Once I input the words I am trying to compare these with other String variables in my program using .equals so it would be best if I can import as Strings. I am also okay with inputting an entire line from a text file as a String in which case Ill just put one word on each line of my file. How do I input words from a text file and store them to String variables?

编辑：
好​​的，那种重复的帮助。它可能适合我，但我的问题有点不同的原因是因为副本只告诉如何读取单行。我试图阅读该行中的单个单词。所以基本上拆分线String。

Okay, that duplicate sort of helps. It might work for me but the reason my question is a little different is because the duplicate only tells how to read a single line. Im trying to read the individual words in the line. So basically splitting the line String.

推荐答案

要从文本文件中读取行，您可以使用它（使用try-with-resources）：

To read lines from a text file, you can use this (uses try-with-resources):

String line;

try (
    InputStream fis = new FileInputStream("the_file_name");
    InputStreamReader isr = new InputStreamReader(fis, Charset.forName("UTF-8"));
    BufferedReader br = new BufferedReader(isr);
) {
    while ((line = br.readLine()) != null) {
        // Do your thing with line
    }
}

要将一行分成单个单词，你可以使用< a href =http://docs.oracle.com/javase/8/docs/api/java/lang/String.html#split-java.lang.String- =noreferrer> String.split ：

To chunk a line into individual words, you can use String.split:

while ((line = br.readLine()) != null) {
    String[] words = line.split(" ");
    // Now you have a String array containing each word in the current line
}

这篇关于如何从文本文件Java中读取单个单词（或行）？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！