如何读取文本文件、搜索逗号、将逗号视为新行并使用 Java 将其导出到新文件？

Question

我有一个 .txt 文件，其中包含 10 亿个以逗号分隔的项目。我希望能够读取 file.txt 文件，允许我的脚本读取逗号，将逗号前的项目复制到新文件中，并在每个逗号后开始一个新行。

当前文本文件格式示例：

one, twenty one, five, one hundred, seven, ten, iwoi-eiwo, ei123_32323 ...

期望的输出：

one,
twenty one,
five,
one hundred, 
seven,
ten,
iwoi-eiwo,
ei123_32323, 
......

有什么建议吗？

Answer 1

所以整个文件只有一行？如果是这样，您只需执行以下操作：

import java.util.Scanner;
import java.io.*;

public class convertToNewline
{
    public static void main(String[] args) throws IOException
    {
        File file = new File("text.txt");
        File file2 = new File("textNoCommas.txt");
        PrintWriter writer = new PrintWriter(file2);
        Scanner reader = new Scanner(file);

        String allText = reader.nextLine();

        allText = allText.replace(", ",   ",");      // replace all commas and spaces with only commas (take out spaces after the commas)
        allText = allText.replace(",",    ",\n");      // replace all commas with a comma and a newline character

        writer.print(allText);
        writer.close();

        System.out.println("Finished printing text.");
        System.out.println("Here was the text:");
        System.out.println(allText);

        System.exit(0);
    }
}

如何读取文本文件、搜索逗号、将逗号视为新行并使用 Java 将其导出到新文件？

How can I read a text file, search for commas, treat commas as new lines, and export it to a new file using Java?

java

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filereader