How to modify a txt file with a temporary file in java?
Question
just wondering why it is not working the code we are using... i create a program that manages products of a store, in a specific of the program the user can add or delete products that are stored in the warehouse, the application shows a grid, that represents part of the store, referring with a ProductDatabase that is uploaded when the user add the product or delete it. for the adding function no problems... when i try to delete a product i read the ProductDatabase, i get the string of which product to delete, i create a temporary file copying in it all the data without the string line referring to the prodcuct i have to delete, then i rewrite the ProductDatabase. at this point i should have uploaded the Database by deleting the product and the specific file line. i don't know why it works and sometimes it doesn't. well i know it sounds strange but that is what happens! this is the code:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.io.*;
import javax.swing.JOptionPane;
/**
*
* @author Kastriot
*/
public class Preleva_Prodotto extends javax.swing.JFrame {
/** Creates new form Ricerca_Prodotto */
public Preleva_Prodotto() {
initComponents();
String fileLine;
try {
FileReader fileReader = new FileReader("DatabaseProdotti.txt");
BufferedReader bufReader = new BufferedReader(fileReader);
int i = 0;
String[] Prodotto = new String[21];
String[] DetProd = new String[6];
while ((fileLine = bufReader.readLine()) != null) {
Prodotto[i] = fileLine;
DetProd = Prodotto[i].split(",");
NomeProdotto = DetProd[0];
Descrizione = DetProd[1];
Peso = Integer.parseInt(DetProd[2]);
CodiceID = DetProd[3];
Posizione = DetProd[4];
DataReg = DetProd[5];
if (Peso <= 500) {
if (Posizione.equals("C0")) {
jLabel1.setText("<html>" + NomeProdotto);
jPanel3.setBackground(Color.red);
} else if (Posizione.equals("C1")) {
jLabel13.setText("<html>" + NomeProdotto);
jPanel4.setBackground(Color.red);
} else if (Posizione.equals("C2")) {
jLabel14.setText("<html>" + NomeProdotto);
jPanel5.setBackground(Color.red);
} else if (Posizione.equals("C3")) {
jLabel15.setText("<html>" + NomeProdotto);
jPanel2.setBackground(Color.red);
} else if (Posizione.equals("C4")) {
jLabel16.setText("<html>" + NomeProdotto);
jPanel6.setBackground(Color.red);
} else if (Posizione.equals("C5")) {
jLabel17.setText("<html>" + NomeProdotto);
jPanel7.setBackground(Color.red);
} else if (Posizione.equals("C6")) {
jLabel18.setText("<html>" + NomeProdotto);
jPanel8.setBackground(Color.red);
}
} else if (Peso <= 1000) {
if (Posizione.equals("B0")) {
jLabel19.setText("<html>" + NomeProdotto);
jPanel16.setBackground(Color.red);
} else if (Posizione.equals("B1")) {
jLabel20.setText("<html>" + NomeProdotto);
jPanel17.setBackground(Color.red);
} else if (Posizione.equals("B2")) {
jLabel21.setText("<html>" + NomeProdotto);
jPanel18.setBackground(Color.red);
} else if (Posizione.equals("B3")) {
jLabel22.setText("<html>" + NomeProdotto);
jPanel19.setBackground(Color.red);
} else if (Posizione.equals("B4")) {
jLabel23.setText("<html>" + NomeProdotto);
jPanel20.setBackground(Color.red);
} else if (Posizione.equals("B5")) {
jLabel24.setText("<html>" + NomeProdotto);
jPanel21.setBackground(Color.red);
} else if (Posizione.equals("B6")) {
jLabel25.setText("<html>" + NomeProdotto);
jPanel22.setBackground(Color.red);
}
} else if (Peso > 1000) {
if (Posizione.equals("A0")) {
jLabel26.setText("<html>" + NomeProdotto);
jPanel9.setBackground(Color.red);
} else if (Posizione.equals("A1")) {
jLabel27.setText("<html>" + NomeProdotto);
jPanel10.setBackground(Color.red);
} else if (Posizione.equals("A2")) {
jLabel28.setText("<html>" + NomeProdotto);
jPanel11.setBackground(Color.red);
} else if (Posizione.equals("A3")) {
jLabel29.setText("<html>" + NomeProdotto);
jPanel12.setBackground(Color.red);
} else if (Posizione.equals("A4")) {
jLabel30.setText("<html>" + NomeProdotto);
jPanel13.setBackground(Color.red);
} else if (Posizione.equals("A5")) {
jLabel31.setText("<html>" + NomeProdotto);
jPanel14.setBackground(Color.red);
} else if (Posizione.equals("A6")) {
jLabel32.setText("<html>" + NomeProdotto);
jPanel15.setBackground(Color.red);
}
}
}
} catch (IOException ex) {
Logger.getLogger(PianoB.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String lineToRemove = jTextField1.getText();
if ((!lineToRemove.equals("A0")) && (!lineToRemove.equals("A1")) && (!lineToRemove.equals("A2")) && (!lineToRemove.equals("A3")) && (!lineToRemove.equals("A4")) && (!lineToRemove.equals("A5")) && (!lineToRemove.equals("A6"))
&& (!lineToRemove.equals("B0")) && (!lineToRemove.equals("B1")) && (!lineToRemove.equals("B2")) && (!lineToRemove.equals("B3")) && (!lineToRemove.equals("B4")) && (!lineToRemove.equals("B5")) && (!lineToRemove.equals("B6"))
&& (!lineToRemove.equals("C0")) && (!lineToRemove.equals("C1")) && (!lineToRemove.equals("C2")) && (!lineToRemove.equals("C3")) && (!lineToRemove.equals("C4")) && (!lineToRemove.equals("C5")) && (!lineToRemove.equals("C6"))) {
JOptionPane.showMessageDialog(this, "La posizione inserita non è esistente, inserire una posizione libera tra quelle disponibili!", "Operazione non riuscita!", JOptionPane.ERROR_MESSAGE);
PosizioneVuota = false;
}
try {
File inputFile = new File("DatabaseProdotti.txt");
File tempFile = new File("C:\\Users\\Kastriot\\Documents\\Università\\tmpFileProdotti.txt");
BufferedReader reader = new BufferedReader(new FileReader(inputFile));
BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));
String[] DetProd = new String[100];
String fileLine;
while ((fileLine = reader.readLine()) != null) {
// trim newline when comparing with lineToRemove
DetProd = fileLine.split(",");
PosDaPrelevare = DetProd[4];
if (!PosDaPrelevare.equals(lineToRemove)) {
writer.write(fileLine);
writer.newLine();
} else {
JOptionPane.showMessageDialog(this, "Il prodotto presente nella posizione " + (lineToRemove) + " è stato prelevato con successo!", "Operazione riuscita", JOptionPane.INFORMATION_MESSAGE);
PosizioneVuota = false;
NuovaSchermata = true;
}
}
reader.close();
writer.flush();
writer.close();
inputFile.delete();
tempFile.renameTo(new File("C:\\Users\\Kastriot\\Documents\\NetBeansProjects\\EasyStorage1.0\\DatabaseProdotti.txt"));
if (PosizioneVuota) {
JOptionPane.showMessageDialog(this, "La posizione " + (lineToRemove) + " non contiene alcun prodotto", "Operazione non riuscita", JOptionPane.INFORMATION_MESSAGE);
}
if (NuovaSchermata) {
Situazione_Generale_ SitGenFrame = new Situazione_Generale_(); //Apre la schermata Situazione Generale
//Centrare la finestra e mostrala sullo schermo
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
SitGenFrame.setSize(950, 480);
Dimension frameSize = SitGenFrame.getSize();
SitGenFrame.setLocation((screenSize.width - frameSize.width) / 2,
((screenSize.height - frameSize.height) / 2));
SitGenFrame.setVisible(true);
}
} catch (IOException ex) {
Logger.getLogger(Preleva_Prodotto.class.getName()).log(Level.SEVERE, null, ex);
}
}
1 answers
solution1
0 2012-12-10 09:42:32
Best bet is to change the file path to absolute path in inputfile .
File inputFile = new File("DatabaseProdotti.txt");
Change it to -
File inputFile = new File("C:\\Users\\Kastriot\\Documents\\NetBeansProjects\\EasyStorage1.0\\DatabaseProdotti.txt");
You can find more about this issue at this question .
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