Attempting to open several files from FileInputStream

[Tukeind]

Hello, I've opened a file (code below) containing file names onto a FileInputStream, and attempting to open each file and place its contents onto a FileOutputStream (or buffer) and need help getting it accomplished.

I am developing the application for a Capstone project at school...where we are developing a:
- Consumer Financial Software System (personal
finance manager)

I am using Java's j2sdk1.4.2_12 on Windows XP

The embolden part of the code is where I like to begin a loop and iterate/cycle through the files on
the FileInputStream (indexFile); having the loop open the file and place it onto a FileOutputStream.

(Thanks)

The code is:

//Program Consumer Financial Software System (Capstone Project)
//File:  CfssAcctSubPanel.java
 
import java.io.*;
import java.awt.*;
import java.lang.*;
import java.util.*;
import java.awt.event.*; // for WindowEvent, ItemEvent, ActionEvent;
import java.awt.event.WindowAdapter;
import javax.swing.*;  //for JFrame, JComboBox, JList, JLabel
import javax.swing.event.*;
 
public class CfssAcctSubPanel extends JPanel
{
    //Create a Vector object, which is a dynamic array that hold objects.
    private static Vector acctList = new Vector();
    private JComboBox acctsCombo;
    private JList casp1List, casp2List;
    private JLabel caspAcctLbl = new JLabel("Account");
    private JLabel caspTrnsLbl = new JLabel("Transaction");
    private JLabel casp2BalLbl = new JLabel("Balance");
    private JLabel casp2ValLbl = new JLabel("Value");
 
    public CfssAcctSubPanel()
    {
    String strAcct = "Accounts";
    String strMasIndex = "MasterAccountsIndex";
    //    int size5 = 180;
 
    try {
        // Extracting username from logonExist file
        FileInputStream username = new FileInputStream( "logonExist");
        int size = username.available();
        byte userArray[] = new byte[size];
        username.read( userArray);
        username.close();
        String login = new String(userArray);
 
        // MasterAccountsIndex file directory
        File userDir = new File(login + "/" + strAcct + "/" + strMasIndex);
        System.out.println(userDir);
 
         // MasterAccountsIndex file listing array (indexArray)
        FileInputStream indexFile = new FileInputStream(userDir);
        int size2 = indexFile.available();
        byte indexArray[] = new byte[size2];
        indexFile.read( indexArray);
        System.out.println(new String(indexArray));
        indexFile.close();
 
    }
    catch(FileNotFoundException fnfe)
        {
        System.out.println("Can't find the file:" + strMasIndex);
        }
    catch(IOException ioe)
        {
        System.out.println("Problem reading the file!");
        }
    }
}
 

[JosAH]

Hello, I've opened a file (code below) containing file names onto a FileInputStream, and attempting to open each file and place its contents onto a FileOutputStream (or buffer) and need help getting it accomplished.

I'm afraid I don't understand your question; you have a single file that contains
the names of a bunch of other files. You have one output file and then what?
Read all those files and write their contents to that single output file?

kind regards,

Jos

[Tukeind]

Jos, I apologize for not getting back to you sooner.

What I am trying to do is:

concatenate multiple InputStream (via SequenceInputStream)...

Details: the program creates several directory once the user key-in their username.
- in the Accounts directory of the user lies test data which I want to open as if I
was at the command line in unix and issued a 'cat Exp_*'...this will display all
the files that start with Exp_...I am trying to get the same affect onto a
InputStream and then place that information into a JList (hopefully)...

Do you understand me now?

Thank you,
Tukeind...

The code I am currently working with is:

//Panel to interact with user on Accounts tab
//File:  CfssAcctSubPanel.java
 
import java.lang.String;
import java.util.Vector;
import java.awt.*;
import java.io.*;
import java.io.File.*;
import java.nio.*;
import java.nio.channels.*;
import java.awt.*;
import java.lang.*;
import java.util.*;
import javax.swing.*;
 
public class CfssAcctSubPanel extends JPanel
{
    // Vector objects
    Vector acctList = new Vector();
 
    private JComboBox acctsCombo;
    private JList casp1List, casp2List;
    private JLabel caspAcctLbl = new JLabel("Account");
    private JLabel caspTrnsLbl = new JLabel("Transaction");
    private JLabel casp2BalLbl = new JLabel("Balance");
    private JLabel casp2ValLbl = new JLabel("Value");
 
    String strMasIndex = "MasterAccountsIndex";
    String strAcct = "Accounts";
    String brLine;
 
    FileInputStream fIn;
    FileChannel fChan;
    long fSize;
    MappedByteBuffer mBuf;
 
    public CfssAcctSubPanel()
    {
    //     acctMapChan amc = new acctMapChan();
    //     amc.teling();
 
    try {
 
    // Extracting username from logonExist file
    FileInputStream username = new FileInputStream( "logonExist");
    int size = username.available();
    byte userArray[] = new byte[size];
    username.read( userArray);
    username.close();
    String login = new String(userArray);
 
    // login and userDir variable combined to render path to
    // MasterAccountsIndex file
    File userDir = new File(login + "/" + strAcct + "/" + strMasIndex);
    System.out.println(userDir);
 
    // "dir" to change path to user Accounts directory
    File dir = new File(login + "/" + strAcct + "/");
    String[] children = dir.list();
    if(children == null) {
        // Either dir does not exist or is not a directory
        } else {
 
        for(int i =0; i<children.length; i++) {
            // Extract filenames from MasterAccountsIndex file 
            FileInputStream fin = new FileInputStream(children[i]);
            acctList.addElement(fin);
            System.out.println(fin);
        }
        InputStream in = new SequenceInputStream(acctList.elements());
        for(int i = in.read(); i != -1; i = in.read()) {
            System.out.write(i);
        }
    }
    }
    catch(FileNotFoundException fnfe)
    {
        System.out.println("Can't find the file:" + strMasIndex);
    }
    catch(IOException ioe)
    {
        System.out.println("Problem reading the file!");
    }    }
 
    public class acctMapChan
    {
    public acctMapChan()
    {
        System.out.println("hello from acctMapChan");
    }
    public void teling()
    {
        System.out.println("hello from teling");
    }
    }
}
 

[Tukeind]

Here is the output when I run the application:

java.io.FileInputStream@b09e89
java.io.FileInputStream@1787038
java.io.FileInputStream@fa9cf
java.io.FileInputStream@55571e
java.io.FileInputStream@ca8327
java.io.FileInputStream@16897b2
java.io.FileInputStream@1bf6770
java.io.FileInputStream@1201a25
java.io.FileInputStream@94948a
java.io.FileInputStream@a401c2
java.io.FileInputStream@16f8cd0

[JosAH]

I don't know whether or not it answers your question because you're supplying
us with so much information and most of it is a red herring, but suppose you have
a List of Files or Strings (the path names of the file). The following little method
returns an InputStream that can read them all:

public InputStream openAll(List<File> files) { // List<String> is fine too
 
   InputStream is= null;
 
   if (files == null || files.length() == 0)
      return is; // nothing to read
 
   is= new FileInputStream(files.get(0));
   for (int i= 1; i < files.length(); i++)
      is= new SequenceInputStream(is, new FileInputStream(files.get(i));
   return is;
}
 

Does this answer your question?

kind regards,

Jos

ps. I left out the '=java' qualifier from the code tag because they've decided to
display class names in light blue, for Pete's sake.

[Tukeind]

Jos,

I am attempting to see if it works now...I'll let you know...I am not trying to lead down the path of red herring trickery...its always challenging to start explaining where you are exactly stuck at in writing a piece of code.

-Tukeind

[Tukeind]

Hello Jos,

I am trying to incorporate the code you gave me into what I already have...(forgive newbie)...could you give me a hint on how to incorporate it into the piece of code where i am doing a directory listing?

Thanks,
Tukeind