Solved

Copy a folder to another folder

Posted on 2002-07-11
3
271 Views
Last Modified: 2010-03-31
Can you write a function that would copy all the contents of a folder, files and subfolders included, to another folder?


Something like:
copyFolder("\\test1","\\test2"); <==>Copy the content of directory test1 to test2.
0
Comment
Question by:yes4me
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 1

Expert Comment

by:klf
ID: 7148198
below is some code to get you started. I tested this on Linux.

import java.lang.*;
import java.io.*;

public class Copy
{
    public static void main(String[] argv)
     throws Exception
    {
     if (argv.length != 2) {
         System.err.println("usage: Copy from_file to_file\n");
     }
     copy(new File(argv[0]), new File(argv[1]));
    }

    public static void copy(File from, File to)
     throws Exception
    {
     if (from.equals(to)) {
         throw new Exception(from.getName() + " and " + to.getName() +
                    " are the same file");
     }
     if (from.isDirectory()) {
         copyDir(from, to);
     } else {
         copyFile(from, to);
     }
    }

    public static void copyDir(File from, File to)
     throws Exception
    {
     System.err.println("creating dir: " + to.getPath());
     to.mkdirs();
     File[] files = from.listFiles();
     for (int i = 0; i < files.length; i++) {
         File tmpTo = new File(to, files[i].getName());
         copy(files[i], tmpTo);
     }
    }

    public static void copyFile(File from, File to)
     throws Exception
    {
     System.err.println("copy: " + from.getPath() + " -> " + to.getPath());
     byte[] buf = new byte[4096];
     FileInputStream fis = new FileInputStream(from);
     FileOutputStream fos = new FileOutputStream(to);
     int i = 0;
     do {
         i = fis.read(buf);
         if (i != -1) {
          fos.write(buf, 0, i);
         }
     } while (i != -1);
     fis.close();
     fos.close();
    }
}










0
 
LVL 1

Accepted Solution

by:
klf earned 100 total points
ID: 7148233
  changed the copyFile to test to see if the from and to are the same.

 public static void copyFile(File from, File to)
     throws Exception
    {
     if (from.equals(to)) {
         throw new Exception(from.getName() + " and " + to.getName() +
                    " are the same file");
     }
     System.err.println("copy: " + from.getPath() + " -> " + to.getPath());
     byte[] buf = new byte[4096];
     FileInputStream fis = new FileInputStream(from);
     FileOutputStream fos = new FileOutputStream(to);
     int i = 0;
     do {
         i = fis.read(buf);
         if (i != -1) {
          fos.write(buf, 0, i);
         }
     } while (i != -1);
     fis.close();
     fos.close();
    }
0
 

Author Comment

by:yes4me
ID: 7149837
Thanks a lot.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Java exception bubble up 2 26
spring jars download 1 67
Finding all private fields and their corresponding getters setters for nested classes 4 30
Setup GlassFish 4 55
An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
Suggested Courses

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question