java实现文件夹的复制

java语言，根据文件夹路径，实现文件夹的复制，包括复制该文件夹下的所有文件。

package com.javabasic.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;


public class FileUtils {
    
    public static void copyFolder(String sourceFolderPath, String targetFolderPath) {
        File sourceFolder = new File(sourceFolderPath);
        String[] sourceFilePathList = sourceFolder.list();
        File targetFolder = new File(targetFolderPath);
        //判断目标文件夹是否存在,没有则创建
        if (!targetFolder.exists()) {
            targetFolder.mkdirs();
        }
        try {
            for (String filePath : sourceFilePathList) {
                if (new File(sourceFolderPath + sourceFolder.separator + filePath).isDirectory()) {
                    copyFolder(sourceFolderPath + sourceFolder.separator + filePath, targetFolderPath + sourceFolder.separator + filePath);
                }
                if (new File(sourceFolderPath + sourceFolder.separator + filePath).isFile()) {
                    copyFile(sourceFolderPath + sourceFolder.separator + filePath, targetFolderPath + sourceFolder.separator + filePath);
                }
            }
        } catch (IOException e) {
            System.out.println("复制文件夹信息出错");
        }
    }

    public static void copyFile(String sourceFilePath, String targetFilePath) throws IOException {
        File sourceFile = new File(sourceFilePath);
        File targetFile = new File(targetFilePath);
        FileInputStream inputStream = new FileInputStream(sourceFile);
        FileOutputStream outputStream = new FileOutputStream(targetFile);
        byte[] buffer = new byte[4096];
        int length = 0;
        while ((length = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, length);
        }
        inputStream.close();
        outputStream.close();
    }

    //测试方法
    public static void main(String[] args) {
        String sourceFolderPath = "D:/Test/demo";
        String targetFolderPath = "D:/Test/copy/demo";
        copyFolder(sourceFolderPath, targetFolderPath);
    }
}