java 复制指定目录中的所有文件和文件夹到另一个指定文件夹中

package com.test;

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

public class CopyFile {

public static void main(String[] args) throws IOException {
// Scanner sc = new Scanner(System.in);
// System.out.println("请输入源目录：");
// String sourcePath = sc.nextLine();
// System.out.println("请输入新目录：");
// String path = sc.nextLine();
//
String sourcePath = "D:/test/A";
String newPath = "D:/test/B";

copyDir(sourcePath, newPath);
}

public static void copyDir(String sourcePath, String newPath) throws IOException {
File file = new File(sourcePath);
String[] filePath = file.list();

if (!(new File(newPath)).exists()) {
(new File(newPath)).mkdir();
}

for (int i = 0; i < filePath.length; i++) {
if ((new File(sourcePath + file.separator + filePath[i])).isDirectory()) {
copyDir(sourcePath + file.separator + filePath[i], newPath + file.separator + filePath[i]);
}

if (new File(sourcePath + file.separator + filePath[i]).isFile()) {
copyFile(sourcePath + file.separator + filePath[i], newPath + file.separator + filePath[i]);
}

}
}
public static void copyFile(String oldPath, String newPath) throws IOException {
File oldFile = new File(oldPath);
File file = new File(newPath);
FileInputStream in = new FileInputStream(oldFile);
FileOutputStream out = new FileOutputStream(file);;

byte[] buffer=new byte[2097152];
int readByte = 0;
while((readByte = in.read(buffer)) != -1){
out.write(buffer, 0, readByte);
}

in.close();
out.close();
}

}