java 小文件合并代码

以下是 Java 合并小文件的代码示例：

import java.io.*;

public class MergeFiles {
    public static void main(String[] args) throws IOException {
        String dirPath = "D:/test/"; // 文件夹路径
        String mergeFileName = "merged.txt"; // 合并后的文件名
        File dir = new File(dirPath);
        File[] files = dir.listFiles();
        if (files == null || files.length == 0) {
            System.out.println("文件夹中没有文件！");
            return;
        }
        File mergeFile = new File(dirPath + mergeFileName);
        if (mergeFile.exists()) {
            mergeFile.delete();
        }
        mergeFile.createNewFile();
        BufferedWriter writer = new BufferedWriter(new FileWriter(mergeFile));
        for (File file : files) {
            if (file.isFile()) {
                BufferedReader reader = new BufferedReader(new FileReader(file));
                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！");
    }
}