Java复制文件到另一个文件夹

以下是Java实现文件夹内所有文件拷贝到另一个文件夹的代码示例：

import java.io.*;

public class CopyFolder {
    public static void main(String[] args) {
        File srcFolder = new File("source folder path");
        File destFolder = new File("destination folder path");

        // 如果目标文件夹不存在，则创建
        if (!destFolder.exists()) {
            destFolder.mkdir();
            System.out.println("Destination folder created successfully");
        }

        // 获取源文件夹下的所有文件和文件夹
        File[] files = srcFolder.listFiles();

        // 遍历所有文件和文件夹
        for (File file : files) {
            // 如果是文件，则直接拷贝
            if (file.isFile()) {
                File destFile = new File(destFolder, file.getName());
                copyFile(file, destFile);
            }
            // 如果是文件夹，则递归调用本方法
            else if (file.isDirectory()) {
                File newDestFolder = new File(destFolder, file.getName());
                newDestFolder.mkdir();
                copyFolder(file, newDestFolder);
            }
        }

        System.out.println("Copy completed successfully");
    }

    // 拷贝文件
    private static void copyFile(File srcFile, File destFile) {
        try (InputStream in = new FileInputStream(srcFile);
             OutputStream out = new FileOutputStream(destFile)) {
            byte[] buffer = new byte[1024];
            int length;
            while ((length = in.read(buffer)) > 0) {
                out.write(buffer, 0, length);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 拷贝文件夹
    private static void copyFolder(File srcFolder, File destFolder) {
        if (!destFolder.exists()) {
            destFolder.mkdir();
        }

        File[] files = srcFolder.listFiles();

        for (File file : files) {
            if (file.isFile()) {
                File destFile = new File(destFolder, file.getName());
                copyFile(file, destFile);
            } else if (file.isDirectory()) {
                File newDestFolder = new File(destFolder, file.getName());
                newDestFolder.mkdir();
                copyFolder(file, newDestFolder);
            }
        }
    }
}

请注意，上述代码中的“source folder path”和“destination folder path”需要替换为实际的源文件夹路径和目标文件夹路径。