Copy a file - A Java Code Example

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This little example shows how to copy a file from one location to another.
The technique is really to read the contents from the file to copy and write it
to the new file.

package com.javadb.examples;

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

public class FileUtil {

  public void copyFile(String fromFile, String toFile) {

    FileInputStream fin = null;
    FileOutputStream fout = null;

    try {

      //check if file exists
      File file = new File(fromFile);
      if (!file.exists() || !file.isFile()) {
        System.out.println("Could not perform operation, file doesn\'t exist");
        return;
      }

      fin = new FileInputStream(file);
      fout = new FileOutputStream(toFile);

        //read from fin and write to fout
        byte[] buffer = new byte[1024];
        int bytesRead;
        while ((bytesRead = fin.read(buffer)) > 0) {
            fout.write(buffer, 0, bytesRead);
        }
    }
    catch (IOException ioe) {
      ioe.printStackTrace();
    }
    finally {
      try {
        if (fin != null)
          fin.close();
        if (fout != null)
          fout.close();
      }
      catch (IOException ioe) {
        ioe.printStackTrace();
      }
    }
  }

  public static void main(String[] args) {
    FileUtil fileutil = new FileUtil();
    fileutil.copyFile("C:\\\\temp\\\\myfile1.txt",
                      "C:\\\\temp\\\\myfile2.txt");
  }
}

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