java文件及文件夹复制_JAVA_编程开发_程序员俱乐部

java复制文件或者文件夹
package com.css.yzh;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
public class BackUp {
/**
     * 复制单个文件
     * @param oldPath String 原文件路径 如：c:/fqf.txt
     * @param newPath String 复制后路径 如：f:/fqf.txt
     * @return boolean
     */
   public void copyFile(String oldPath, String newPath) {
       try {
           int bytesum = 0;
           int byteread = 0;
           File oldfile = new File(oldPath);
           if (oldfile.exists()) { //文件存在时
               InputStream inStream = new FileInputStream(oldPath); //读入原文件
               FileOutputStream fs = new FileOutputStream(newPath);
               byte[] buffer = new byte[1444];
               int length;
               while ( (byteread = inStream.read(buffer)) != -1) {
                   bytesum += byteread; //字节数 文件大小
                   System.out.println(bytesum);
                   fs.write(buffer, 0, byteread);
               }
               inStream.close();
           }
       }
       catch (Exception e) {
           System.out.println("复制单个文件操作出错");
           e.printStackTrace();
       }
   }
   /**
     * 复制整个文件夹内容
     * @param oldPath String 原文件路径 如：c:/fqf
     * @param newPath String 复制后路径 如：f:/fqf/ff
     * @return boolean
     */
   public void copyFolder(String oldPath, String newPath) {
       try {
           (new File(newPath)).mkdirs(); //如果文件夹不存在 则建立新文件夹
           File a=new File(oldPath);
           String[] file=a.list();
           File temp=null;
           for (int i = 0; i < file.length; i++) {
               if(oldPath.endsWith(File.separator)){
                   temp=new File(oldPath+file[i]);
               }
               else{
                   temp=new File(oldPath+File.separator+file[i]);
               }
               if(temp.isFile()){
                   FileInputStream input = new FileInputStream(temp);
                   FileOutputStream output = new FileOutputStream(newPath + "/" +
                           (temp.getName()).toString());
                   byte[] b = new byte[1024 * 5];
                   int len;
                   while ( (len = input.read(b)) != -1) {
                       output.write(b, 0, len);
                   }
                   output.flush();
                   output.close();
                   input.close();
               }
               if(temp.isDirectory()){//如果是子文件夹
                   copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]);
               }
           }
       }
       catch (Exception e) {
           System.out.println("复制整个文件夹内容操作出错");
           e.printStackTrace();
       }
   }
   public static void main(String args[]){
    BackUp bp = new BackUp();
    bp.copyFolder("D:\\a","E:\\b");
   }
}
转载：http://blog.163.com/yangzhanghui_job/blog/static/179575062201271335927750/