Java实现复制一个目录下的所有文件

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

/*
* 功能：将一个目录下的文件全部复制
* 新文件命名规则：原文件名+当前系统时间
* 同时输出复制总文件个数
* */

public class CopyFromSrcToDest {
public static void main(String[] args) throws IOException{
File srcDir = new File("F://testcopy");
File src = null;
File dest = null;
String destPath = "";
Date date = new Date();
int count = 0;
//判断是否是目录
if(srcDir.isDirectory()){
File[] files = srcDir.listFiles();
for(File file:files){
src = file;
String wholefileName = src.getName();
//将文件名和文件后缀区分开来
int dotIndex = wholefileName.lastIndexOf(".");
String fileName = wholefileName.substring(0, dotIndex);
String fileExtend = wholefileName.substring(dotIndex);
//规定复制文件的文件名
//此处用到了File.separator获取系统使用的文件路径分隔符，具有跨平台的优点
destPath = src.getParent()+ File.separator +fileName+"_"
+date.toString().replace(":", "").replace(" ", "_")+fileExtend;
System.out.println(destPath);
dest = new File(destPath);
dest.createNewFile();
FileInputStream fisSrc = new FileInputStream(src);
FileOutputStream fosDest = new FileOutputStream(dest);
byte[] by = new byte[1024];
int length;

while((length = fisSrc.read(by)) != -1){
fosDest.write(by, 0, length);
count++;
}

try{
if(fisSrc != null){
fisSrc.close();
}
if(fosDest != null){
fosDest.close();
}
}catch(Exception e){
e.printStackTrace();
}
}
System.out.println("总共复制了:"+ count +"个文件.");
}
}
}