How to copy a file in JAVA?

Hi,

I am trying to copy a file in java but not understanding what i am missing?
Can anyone help me with this?

Try this code!

Code:

---

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Copy {
  public static void main(String[] args) throws IOException {
    File inputFile = new File("farrago.txt");
    File outputFile = new File("outagain.txt");

    FileReader in = new FileReader(inputFile);
    FileWriter out = new FileWriter(outputFile);
    int c;

    while ((c = in.read()) != -1)
      out.write(c);

    in.close();
    out.close();
  }
}

---

Copy a File

Code:

---


import java.io.*;

    public class jCOPY {
        public static void main(String args[]){
            try {
            jCOPY j = new jCOPY();
            j.CopyFile(new File(args[0]),new File(args[1]));
        }
            catch (Exception e) {
            e.printStackTrace();
        }
    }
   
        public void CopyFile(File in, File out) throws Exception {
        FileInputStream fis = new FileInputStream(in);
        FileOutputStream fos = new FileOutputStream(out);
        byte[] buf = new byte[1024];
        int i = 0;
            while((i=fis.read(buf))!=-1) {
            fos.write(buf, 0, i);
        }
        fis.close();
        fos.close();
    }
}

---

Java does not provide a standard method to copy a file. To implement copying you need to read all bytes from source file and write to destination. The read() method will return -1 when of is reached, otherwise it returns the number of bytes read.

Code:

---

  1.      public static void copy(File source, File destination)
  2.        throws IOException
  3.      {
  4.        // Open file to be copied
  5.        InputStream in = new FileInputStream(source);
  6.     
  7.        // And where to copy it to
  8.        OutputStream out = new FileOutputStream(destination);
  9.     
  10.        // Read bytes and write to destination until eof
  11.     
  12.        byte[] buf = new byte[1024];
  13.        int len = 0;
  14.        while ((len = in.read(buf)) > 0)
  15.        {
  16.            out.write(buf, 0, len);
  17.        }
  18.     
  19.        // close both streams
  20.     
  21.
        in.close();
  22.
        out.close();
  23.
      }

---