I need help with copying files in java?

Question

hi, i use the following code sample to copy a directory structure and its files.
It copy's the directory-structure, but all the files in it have 0kb as size. except one file.
Here's the code:
public static void copyDir(String source, String target)
String [] listing = new String [0];
FileReader in = null;
FileWriter out = null;
String sourcePath = source;
String targetPath = target;
// Maakt directory onder target directory
File f = new File(targetPath);
f.mkdir();
// Maakt filelist van bestanden in source-directory
f = new File(sourcePath);
listing = f.list();
for(int i = 0; i < listing.length; i++)
f = new File(sourcePath + listing);
if(f.isDirectory())
copyDir(source + listing[i] + File.separatorChar,
target + listing[i] + File.separatorChar);
else
try
in = new FileReader(sourcePath + listing[i]);
out = new FileWriter(targetPath + listing[i]);
int t;
while (-1 != (t = in.read()))
out.write(t);
try { Thread.sleep(200); } catch (InterruptedException e) { }
System.out.println("Copied: " + sourcePath + listing[i]);
catch (Exception e)
System.out.println(e);

Answer 1

Here is a quick copy program that works. You'll need to deal with the exception instead of just throwing it though.
import java.io.*;
public class Copy
  private static void copy(String source, String target) throws IOException
    // Create directory
    File file=new File(target);
    file.mkdirs();
    // Get contents
    file=new File(source);
    File[] files=file.listFiles();
    // Copy files
    int length;
    byte[] buffer=new byte[1024];
    for(int i=0; i<files.length; i++)
      String destination=target+File.separator+files[ i ].getName();
      if(files[ i ].isDirectory())
        copy(files[ i ].getPath(), destination);
      else
        FileInputStream in=new FileInputStream(files[ i ]);
        FileOutputStream out=new FileOutputStream(destination);
        while((length=in.read(buffer))!=-1)
          out.write(buffer, 0, length);
        in.close();
        out.close();
  public static void main(String[] args) throws IOException
    copy(args[0], args[1]);
}[\code]