java 复制文件夹下所有文件到指定的文件夹,不改变目录结构

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class Demo3 { public static void main(String[] args) throws IOException {  String path = "/home/mrzhan/workspace/copy";  String copyPath = "/home/mrzhan/workspace/copyPath";  copy(path,copyPath); } public static void copy(String path, String copyPath) throws IOException{  File filePath = new File(path);  DataInputStream read ;  DataOutputStream write;  if(filePath.isDirectory()){   File[] list = filePath.listFiles();   for(int i=0; i<list.length; i++){    String newPath = path + File.separator + list[i].getName();    String newCopyPath = copyPath + File.separator + list[i].getName();    File newFile = new File(copyPath);    if(!newFile.exists()){     newFile.mkdir();    }    copy(newPath, newCopyPath);   }  }else if(filePath.isFile()){   read = new DataInputStream(     new BufferedInputStream(new FileInputStream(path)));   write = new DataOutputStream(     new BufferedOutputStream(new FileOutputStream(copyPath)));   byte [] buf = new byte[1024*512];   while(read.read(buf) != -1){    write.write(buf);   }   read.close();   write.close();  }else{   System.out.println("请输入正确的文件名或路径名");  } }}