Problem while copying two files into same file

Question

Hi,
I want to copy n number of files into the same file.I am using the below code for the purpose.
private void testFiles(){
          FileOutputStream fos = null;
          String file1  = "C:"+File.separator+"test1.doc";
          String file2 = "C:"+File.separator+"test2.doc";
          String file = "C:"+File.separator+"test123.doc";
          File testFile = new File(file);
          ArrayList arrFiles = new ArrayList();
          arrFiles.add(file1);
          arrFiles.add(file2);
          try {
                fos = new FileOutputStream(file,true);
               for(int i = 0; i < arrFiles.size();i++){
                    int ReadBytes = 0;
                    int BUFSIZ = 4096;
                    long fileSize ;
                    long copiedBytes=0;
                    String curFileName = (String) arrFiles.get(i);
                    File srcFile = new File(curFileName);
                    FileInputStream fis = new FileInputStream(srcFile);
                     fileSize = srcFile.length();
                    byte Buf[] = new byte[BUFSIZ];
                    while(copiedBytes < fileSize)
                         ReadBytes = fis.read(Buf, 0, BUFSIZ);
                         fos.write(Buf,0,ReadBytes);
                         copiedBytes +=ReadBytes;
                    System.out.println("copied files::"+curFileName);
               fis.close();
               fos.flush();
          } catch (FileNotFoundException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } finally{
               try {
                    if(fos != null){
                         fos.flush();
                         fos.close();
               } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
     }Iam expecting that both the files will be copied sucessfully.But iam able to see only one file.But the file size of the destination file is the sum of both the source files copied.So that means the content is copied.Any ideas on possible causes/solutions.
Thanks in advance.

Answer 1

Hi,
Just a thought, if you build a sequence of inputstream using SequenceInputStream something like that
                String file1  = "C:"+File.separator+"test1.doc";
          String file2 = "C:"+File.separator+"test2.doc";
          FileInputStream s1 = new FileInputStream(file1); 
          FileInputStream s2 = new FileInputStream(file2);
          FileInputStream[] array = new FileInputStream[2];
          array[0] = s1;
          array[1] = s2;
          EnumerationImpl enumeration = new EnumerationImpl(array);
          SequenceInputStream sequence = new SequenceInputStream(enumeration);
               //code here the read to go through the sequence of inputstream and write them  into FileOutputStream
// and your Enumberation implementation class as below
public class EnumerationImpl implements Enumeration<FileInputStream> {
    private FileInputStream[] array;
    private int index;
    public EnumerationImpl(FileInputStream[] array) {
        this.array = array;
    public boolean hasMoreElements() {
        return index < array.length;
    public FileInputStream nextElement() {
        if (index < array.length) {
            return array[index++];
        throw new NoSuchElementException();
} Regards,
Alan Mehio
London, UK