Ich möchte eine Textdatei mit dem Namen vom Benutzer und dem darin geschriebenen Namen erstellen?

Question

Ich habe dieses Programm für meine Uni-Aufgabe geschrieben. Die Hauptidee ist, wenn das addItem aufgerufen wird, erstellt es eine Textdatei und Schreibreihenfolge vom Benutzer für diese Datei. Aber wie auch immer, es erstellt nur die Datei, druckt aber nichts auf der Innenseite.

import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.FileReader; 
import java.io.FileWriter; 
import java.io.IOException; 
import java.io.OutputStreamWriter; 
import java.io.PrintWriter; 
import java.io.Writer; 


public class OrderedFood extends Food { 

private int quantity; 
private boolean isSet; 
private SetDrink setDrink; 


public OrderedFood(){ 
    quantity = 0; 
    isSet = false; 
    setDrink = null; 
} 

public OrderedFood(String foodCode, String foodName,boolean isSet, SetDrink setDrink, int quantity){ 
    super(foodCode, foodName); 
    this.isSet = isSet; 
    this.quantity = quantity; 
    this.setDrink = setDrink; 
} 

public int getquantity(){ 
    return quantity; 
} 

public void setquantity(int quantity){ 
    this.quantity = quantity; 
} 

public boolean getIsSet(){ 
    return isSet; 
} 
public void setisSet(boolean isSet){ 
    this.isSet = isSet; 
} 
public SetDrink getsetDrink(){ 
    return setDrink; 
} 
public void setsetDrink(SetDrink setDrink){ 
    this.setDrink = setDrink; 
} 

public void addItem (String foodCode, int TabNum)throws IOException{ 
    clearScreen(); // invoking the clearScreen method 


    String filename = Integer.toString(TabNum); 
    try 
    { 
     //this blocks creates a table by the table num 
     File file = new File("/tmp", filename);  
     System.out.println("path=" + file.getAbsolutePath()); 
     file.createNewFile(); 

     System.out.println("File created"); 
    } 
    catch(Exception e) 
    { 
     e.printStackTrace(); 
     System.out.println("Failed to create file"); 
    } 
    try (Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filename), "utf-8"))) 
    { 
     writer.write("foodCode"); // this syntax prints the order 
     writer.close(); 
    } 

} 
public void deleteItem(String foodCode , int TabNum)throws IOException{ 
    clearScreen(); 

    String Tab = Integer.toString(TabNum); 

    remove(Tab,foodCode);// we just invoke the remove method, which will then remove the item from the .txt file 
} 


public static void clearScreen() { // this method clears the screen. 
    System.out.print("\033[H\033[2J"); 
    System.out.flush(); 
    } 


public void remove(String file, String lineToRemove)throws IOException { 

     try { 

      File inFile = new File(file); 

      if (!inFile.isFile()) { 
       System.out.println("Parameter is not an existing file"); 
       return; 
      } 

      File tempFile = new File(inFile.getAbsolutePath() + ".tmp"); 

      BufferedReader buff = new BufferedReader(new FileReader(file)); 
      PrintWriter kap = new PrintWriter(new FileWriter(tempFile)); 

      String line = null; 


      while ((line = buff.readLine()) != null) { 

       if (!line.trim().equals(lineToRemove)) { 

        kap.println(line); 
        kap.flush(); 
       } 
      } 
      kap.close(); 
      buff.close(); 

      if (!inFile.delete()) { 
       System.out.println("Could not delete file"); 
       return; 
      } 

      if (!tempFile.renameTo(inFile)) 
       System.out.println("Could not rename file"); 

     } catch (FileNotFoundException ex) { 
      ex.printStackTrace(); 
     } catch (IOException ex) { 
      ex.printStackTrace(); 
     } 
     } 

    } 

Answer 1

Es ist ein logischer Fehler, wenn Sie eine Datei erstellen, die Sie nicht die Erweiterung auch sagen, beim Öffnen der Datei zum Schreiben Sie Dateinamen verwendet, aber es enthält nur die tabnumber nicht der vollständige Pfad den Code unten verwenden, um Datei

import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.FileReader; 
import java.io.FileWriter; 
import java.io.IOException; 
import java.io.OutputStreamWriter; 
import java.io.PrintWriter; 
import java.io.Writer; 


public class OrderedFood extends Food { 

private int quantity; 
private boolean isSet; 
private SetDrink setDrink; 


public OrderedFood(){ 
    quantity = 0; 
    isSet = false; 
    setDrink = null; 
} 

public OrderedFood(String foodCode, String foodName,boolean isSet, SetDrink setDrink, int quantity){ 
    super(foodCode, foodName); 
    this.isSet = isSet; 
    this.quantity = quantity; 
    this.setDrink = setDrink; 
} 

public int getquantity(){ 
    return quantity; 
} 

public void setquantity(int quantity){ 
    this.quantity = quantity; 
} 

public boolean getIsSet(){ 
    return isSet; 
} 
public void setisSet(boolean isSet){ 
    this.isSet = isSet; 
} 
public SetDrink getsetDrink(){ 
    return setDrink; 
} 
public void setsetDrink(SetDrink setDrink){ 
    this.setDrink = setDrink; 
} 

public void addItem (String foodCode, int TabNum)throws IOException{ 
    clearScreen(); // invoking the clearScreen method 


    String filename = Integer.toString(TabNum); 
    try 
    { 
     //this blocks creates a table by the table num 
     File file = new File("/tmp", filename);  
     System.out.println("path=" + file.getAbsolutePath()); 
     file.createNewFile(); 
     filename = file.getAbsolutePath(); //here the actual address is updated to use later 

     System.out.println("File created"); 
    } 
    catch(Exception e) 
    { 
     e.printStackTrace(); 
     System.out.println("Failed to create file"); 
    } 
    try 
    { 
     //now here we need that address updated earlier not just the tabnumber 
     PrintWriter writer = new PrintWriter(filename, "UTF-8"); 
     writer.print("food code"); 
     riter.close(); 
    } 

} 
public void deleteItem(String foodCode , int TabNum)throws IOException{ 
    clearScreen(); 

    String Tab = Integer.toString(TabNum); 

    remove(Tab,foodCode);// we just invoke the remove method, which will then remove the item from the .txt file 
} 


public static void clearScreen() { // this method clears the screen. 
    System.out.print("\033[H\033[2J"); 
    System.out.flush(); 
    } 


public void remove(String file, String lineToRemove)throws IOException { 

     try { 

      File inFile = new File(file); 

      if (!inFile.isFile()) { 
       System.out.println("Parameter is not an existing file"); 
       return; 
      } 

      File tempFile = new File(inFile.getAbsolutePath() + ".tmp"); 

      BufferedReader buff = new BufferedReader(new FileReader(file)); 
      PrintWriter kap = new PrintWriter(new FileWriter(tempFile)); 

      String line = null; 


      while ((line = buff.readLine()) != null) { 

       if (!line.trim().equals(lineToRemove)) { 

        kap.println(line); 
        kap.flush(); 
       } 
      } 
      kap.close(); 
      buff.close(); 

      if (!inFile.delete()) { 
       System.out.println("Could not delete file"); 
       return; 
      } 

      if (!tempFile.renameTo(inFile)) 
       System.out.println("Could not rename file"); 

     } catch (FileNotFoundException ex) { 
      ex.printStackTrace(); 
     } catch (IOException ex) { 
      ex.printStackTrace(); 
     } 
     } 

    }