无法将txt文件复制到arraylist和文件中

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;

public class FileCopyExample {
    public static void main(String[] args) {
        String sourceFilePath = "source.txt"; // 源文件路径
        String targetFilePath = "target.txt"; // 目标文件路径

        // 读取txt文件内容到ArrayList
        ArrayList<String> dataList = readTxtFile(sourceFilePath);

        // 将ArrayList数据写入文件
        writeTxtFile(dataList, targetFilePath);
    }

    // 读取txt文件内容到ArrayList
    private static ArrayList<String> readTxtFile(String filePath) {
        ArrayList<String> dataList = new ArrayList<>();

        try (FileInputStream fis = new FileInputStream(filePath);
             BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
            String line;
            while ((line = reader.readLine()) != null) {
                dataList.add(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        return dataList;
    }

    // 将ArrayList数据写入文件
    private static void writeTxtFile(ArrayList<String> dataList, String filePath) {
        try (FileOutputStream fos = new FileOutputStream(filePath);
             BufferedWriter writer = new BufferedWriter(new FileWriter(filePath))) {
            for (String data : dataList) {
                writer.write(data);
                writer.newLine();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}