如何在Java中仅更改文件名的一部分？

Question

我有一个名为“ParkPhotos.txt”的文件，里面有一些公园的12个名字，例如“AmericanMosao_photo.jpg”。我想把“_photo.jpg”改成“_info.txt”，但我很挣扎。在代码中，我能够读取该文件，但我不确定如何替换它。

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class FileNameChange {

    public static void main(String[] args) throws IOException
    {

        readFileValues();

    }

    public static void readFileValues() throws IOException
    {
        try {
            File aFile  = new File("ParkPhotos.txt");
            Scanner inFile = new Scanner(aFile);

            while (inFile.hasNextLine())
            {
                String parkNames = inFile.nextLine();
                System.out.println(parkNames);
           
            }
           inFile.close();
        } catch (FileNotFoundException e)
        {
            System.out.println("An error has occurred");
            e.printStackTrace();
        }


    }

}

Answer 1

您可以转换为新内容并将其写入当前文件。例如：

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Scanner;

public class FileNameChange {

    public static void main(String[] args) throws URISyntaxException {
        String newContent = readFileValues();
        writeFileValues(newContent);
    }

    public static String readFileValues() {
        StringBuilder newContent = new StringBuilder();

        try {
            URL url = FileNameChange.class.getClassLoader().getResource("ParkPhotos.txt");
            File aFile = new File(url.toURI());
            Scanner inFile = new Scanner(aFile);

            while (inFile.hasNextLine()) {
                String parkName = inFile.nextLine();
                if (parkName == null || parkName.isEmpty()) {
                    continue;
                }
                newContent.append(parkName.replace("_photo.jpg", "_info.txt"))
                        .append(System.lineSeparator());
            }
            inFile.close();
        } catch (FileNotFoundException | URISyntaxException e) {
            e.printStackTrace();
        }
        return newContent.toString();
    }

    public static void writeFileValues(String content) throws URISyntaxException {
        URL url = FileNameChange.class.getClassLoader().getResource("ParkPhotos.txt");
        File aFile = new File(url.toURI());
        try (FileWriter writer = new FileWriter(aFile)) {
            writer.write(content);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

注意：文件将写入构建文件夹。例如：example_1/构建/资源/main