Reading files and splitting them

[Dieter]

hey hey,

i'm stuck at splitting my input i get from the FileReader.
For school i had to make an app where i write and array into a file using the FileWriter.

all cool and easy..but then i need to get that file, split it and make an object from it.

i tried several ways and i know i need to use an array to split it but i have no idea how to get it to the output.

i did API research and google research but i don't understand it.

Could you take a look at my code?


Making a class of customers...

public class Klant implements Comparable <Klant> {

    private int klantenNr;
    private String naam;
    private String achternaam;
    private String straat;
    private int nr;
    private String gemeente;
    private int Postcode;

    public Klant(int klantenNr, String naam, String achternaam, String straat, int nr, String gemeente, int Postcode) {
        this.klantenNr = klantenNr;
        this.naam = naam;
        this.achternaam = achternaam;
        this.straat = straat;
        this.nr = nr;
        this.gemeente = gemeente;
        this.Postcode = Postcode;
    }

    public int getPostcode() {
        return Postcode;
    }

    public void setPostcode(int Postcode) {
        this.Postcode = Postcode;
    }

    public String getAchternaam() {
        return achternaam;
    }

    public void setAchternaam(String achternaam) {
        this.achternaam = achternaam;
    }

    public String getGemeente() {
        return gemeente;
    }

    public void setGemeente(String gemeente) {
        this.gemeente = gemeente;
    }

    public int getKlantenNr() {
        return klantenNr;
    }

    public void setKlantenNr(int klantenNr) {
        this.klantenNr = klantenNr;
    }

    public String getNaam() {
        return naam;
    }

    public void setNaam(String naam) {
        this.naam = naam;
    }

    public int getNr() {
        return nr;
    }

    public void setNr(int nr) {
        this.nr = nr;
    }

    public String getStraat() {
        return straat;
    }

    public void setStraat(String straat) {
        this.straat = straat;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final Klant other = (Klant) obj;
        if (this.klantenNr != other.klantenNr) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        return (int) this.klantenNr;
    }

@Override
    public String toString() {
        return klantenNr + ":" + naam + ":" + achternaam
                         + ":" + straat + ":" + nr + ":"
                         + gemeente + ":" + Postcode ;
    }

    public int compareTo(Klant o) {
        return this.achternaam.compareTo(o.achternaam);
    }

}

Now let's start writing it into a file...

import java.io.*;
import java.io.FileWriter;
import java.util.*;

/**
 *
 * @author Dieter
 */
public class KlantenApp {

          FileWriter file = null;

         Set<Klant> klantenBestand = new TreeSet<Klant>();
             klantenBestand.add(new Klant (1234, "Dieter", "De Wreede", "Henisstraat", 13, "Tongeren", 3700));
             klantenBestand.add(new Klant (5678, "Sarah", "Welkenhuyzen", "Bunzingpad", 1, "Lanaken", 3850));
             klantenBestand.add(new Klant (9101, "Davy", "De Wreede", "Henisstraat", 13, "Tongeren", 3700));
             klantenBestand.add(new Klant (1121, "Meneer", "Koekenbak", "Roomboterlaan", 180, "Graden", 1337));
             klantenBestand.add(new Klant (3141, "Mevrouw", "Klets", "Koffiewal", 2, "Roddeltopia", 8000));
       try{
            File fileName = new File ("c:\\CrapMap\\KlantenBestand.txt");
              file = new FileWriter(fileName, true);
            file.write("Welkom in het klantenBestand!"
                            + "\n"
                            + "==============================="
                            + "\n"
                            + "Totaal overzicht van de klanten: "
                            + "Current count = " + klantenBestand.size()
                            + "\n\n");
           
            Iterator i1 = klantenBestand.iterator();
            while(i1.hasNext()){
                file.write(i1.next() + "\n" );
                         
            }
       }
        
       catch(IOException ex){
           System.out.println("oops, something went wrong!");
           System.out.println(ex.getMessage());
       }
       finally{
           try{
               if(file != null) file.close();
           }
           catch(IOException ex){
               System.out.println("fault");
           }
       }
    }
}

now i created it, i want to read it and split it, notice i can read from it allready but i don't know how to split it, i tried stuff but don't know how to do it anymore...

import java.io.*;
/**
 *
 * @author Dieter
 */
public class ReadKlanten {
    public static void main(String[] args) {
         FileReader file = null;

        try{
            int character;
            File fileName= new File("c:\\CrapMap\\KlantenBestand.txt");
            file = new FileReader(fileName);
            while((character = file.read()) != -1){
                System.out.print((char)character);
            }
            System.out.println("");
        }
        catch(IOException ex){
           System.out.println("oops, something went wrong!");
           System.out.println(ex.getMessage());
       }
       finally{
           try{
               if(file != null) file.close();
           }
           catch(IOException ex){
               System.out.println("fault");
           }
    }
    }
}

hope you guys can help me figure this out cause i don't know how to do it.

Thanks in advence,

Dieter

[r035198x]

Wrap the FileReader with a BufferedReader and use the readLine() method to read a line from the file.
Then use String.split(",") to split the line into individual values again.
You'd then have a problem if your values contain a comma themselves.

[Tolls]

You'll also need to deal with the header you've put into the file.

[Dieter]

Wrap the FileReader with a BufferedReader and use the readLine() method to read a line from the file.
Then use String.split(",") to split the line into individual values again.
You'd then have a problem if your values contain a comma themselves.

thx for your quick reply mate :)
i will give it a try, i allready added ":" to the toString method for splitting them.
was thinking about calculating the amount of ":" and then write it to output. don't know if that will work.

You'll also need to deal with the header you've put into the file.

isnt there a way to skip the header part? else i just trow the header part away, it was just for the show :p

all the best,

Dieter

[Dieter]

i think i got it now, not sure tho :p

only thing is the header. Just need to make some changes :)

thx for helping me clear this out :)

package FileSchrijver;

import java.io.*;
import java.util.*;

public class LezenKlant {
	public static void main(String[] args) throws IOException{
		
	Collection<Klant> hS= new TreeSet<Klant>();
    LineNumberReader lineNumberReader=null;
    File file=new File("c:\\CrapMap\\KlantenBestand.txt");
    String text;
    String[] geg = new String[7];
   
   try {
       lineNumberReader=new LineNumberReader(new FileReader(file));            
       while((text=lineNumberReader.readLine())!=null){
           geg=text.split(" ");
       hS.add(new Klant(Integer.parseInt(geg[0]), geg[1], geg[2], geg[3], Integer.parseInt(geg[5]), geg[4], Integer.parseInt(geg[6])));            
       }
       Iterator<Klant> i=hS.iterator();
       while(i.hasNext()){
           System.out.println(i.next());
       }
   }
   catch (IOException exception) {
       System.out.println("foutje");
       System.out.println(exception.getMessage());
   }
   finally{
       try {
           if(lineNumberReader!=null){
               lineNumberReader.close();
           }
       }
       catch (Exception exception) {
           System.out.println("foutje1");
           System.out.println(exception.getMessage());
       }
   }
	
  }
}

All the best,

Dieter

[Tolls]

Stick some sort of marker after the header, in the line before the data starts.
Then you can simply read until you hit that point.