使用java合并多个文件

import java.io.*;

public class FileMerger {
    public static void main(String[] args) {
        String[] fileNames = {"file1.txt", "file2.txt", "file3.txt"}; // 要合并的文件列表
        String outputFileName = "mergedFile.txt"; // 合并后的输出文件名

        try {
            File outputFile = new File(outputFileName);
            BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile));

            for (String fileName : fileNames) {
                File inputFile = new File(fileName);
                BufferedReader reader = new BufferedReader(new FileReader(inputFile));

                String line;
                while ((line = reader.readLine()) != null) {
                    writer.write(line);
                    writer.newLine();
                }

                reader.close();
            }

            writer.close();
            System.out.println("文件合并完成！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}