写入一个文本文件，然后读回到一个textarea javafx

Question

我已经做了一个javafx应用程序，将一个订单写入一个txt文件，然后即时阅读txt文件到一个textarea。 我的代码正在工作并正在打印文件，但我不知道如何正确地格式化它。我是javafx的noob，我写错了吗？任何帮助表示赞赏

这是写入文件的代码的主要部分。

Date date = new Date(); 
     SimpleDateFormat ft = new SimpleDateFormat ("E yyyy.MM.dd 'at' hh:mm:ss a zzz"); 

    BufferedWriter bf = new BufferedWriter(new FileWriter("receipt.txt")); 
    bf.write("*************SHERIDAN BAGEL SHOP*************,"); 
    bf.newLine(); 
    bf.write(ft.format(date)); 
    bf.newLine(); 
    bf.write("Item:\t\t\tQty\tAmount,"); 
    bf.newLine(); 
bf.write("\t\t\t\t-----------"); 
     bf.newLine(); 
     bf.write("Pretax Total\t\t\t$"+df.format(cost)+","); 
     bf.newLine(); 
     bf.write("Sales Tax 13%\t\t\t$"+df.format(calctax)+","); 
     bf.newLine(); 
     bf.write("Total Sale\t\t\t$"+df.format(calctotal)+","); 
     bf.newLine(); 
     bf.write("*********THANK YOU FOR YOUR ORDER*********,"); 

     bf.close(); 

这是文本文件输出

*************SHERIDAN BAGEL SHOP*************, 
Sat 2017.04.01 at 01:06:57 PM EDT 
Item:   Qty  Amount, 
         ----------- 
Pretax Total   $0.00, 
Sales Tax 13%   $0.00, 
Total Sale    $0.00, 
*********THANK YOU FOR YOUR ORDER*********, 

这是读取文件

@FXML 
    private TextArea receipt; 

public void ViewReceipt() { 
    try { 
     Scanner s = new Scanner(new File("receipt.txt")); 
     while (s.hasNext()) { 
      receipt.appendText(s.nextLine()+"\n"); 
     } 
    } catch (FileNotFoundException ex) { 
     System.err.println(ex); 
    } 


} 

这是它是如何在textarea的代码

*************SHERIDAN BAGEL SHOP*************, 
Sat 2017.04.01 at 01:06:57 PM EDT 
Item:   Qty Amount, 
       ----------- 
Pretax Total   $0.00, 
Sales Tax 13%   $0.00, 
Total Sale   $0.00, 
*********THANK YOU FOR YOUR ORDER*********, 

Answer 1

你可以玩这个。如果所有收据看起来都非常相似。

import java.io.*; 
import java.text.*; 
import java.util.*; 
import java.util.logging.*; 
import javafx.application.*; 
import javafx.event.*; 
import javafx.scene.*; 
import javafx.scene.control.*; 
import javafx.scene.layout.*; 
import javafx.stage.*; 

/** 
* 
* @author Sedrick 
*/ 
public class JavaFXApplication22 extends Application { 

    TextArea textArea; 

    @Override 
    public void start(Stage primaryStage) 
    { 
     textArea = new TextArea(); 

     Button btn = new Button(); 
     btn.setText("Say 'Hello World'"); 
     btn.setOnAction(new EventHandler<ActionEvent>() { 

      @Override 
      public void handle(ActionEvent event) 
      { 
       Date date = new Date(); 
       SimpleDateFormat ft = new SimpleDateFormat("E yyyy.MM.dd 'at' hh:mm:ss a zzz"); 
       String pattern = "$###,###.###"; 
       DecimalFormat df = new DecimalFormat(pattern); 

       try (BufferedWriter bf = new BufferedWriter(new FileWriter("receipt.txt"))) 
       { 
        bf.write("*************SHERIDAN BAGEL SHOP*************,"); 
        bf.newLine(); 
        bf.write(ft.format(date)); 
        bf.newLine(); 
        bf.write(writeSpace(25, "Item:") + writeSpace(12, "Qty") + "Amount,"); 
        bf.newLine(); 
        bf.write(writeSpace(35, "") + "-----------"); 
        bf.newLine(); 
        bf.write(writeSpace(35, "Pretax Total") + df.format(100.0) + ","); 
        bf.newLine(); 
        bf.write(writeSpace(35, "Sales Tax 13%") + df.format(10000.0) + ","); 
        bf.newLine(); 
        bf.write(writeSpace(35, "Total Sale") + df.format(10.0) + ","); 
        bf.newLine(); 
        bf.write("*********THANK YOU FOR YOUR ORDER*********,"); 
       } 
       catch (IOException ex) 
       { 
        Logger.getLogger(JavaFXApplication22.class.getName()).log(Level.SEVERE, null, ex); 
       } 

       ViewReceipt(); 
      } 
     }); 

     VBox root = new VBox(); 
     root.getChildren().addAll(textArea, btn); 

     Scene scene = new Scene(root, 500, 500); 

     primaryStage.setTitle("Hello World!"); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 

    public void ViewReceipt() 
    { 
     try 
     { 
      Scanner s = new Scanner(new File("receipt.txt")); 
      while (s.hasNext()) 
      { 
       String line = s.nextLine(); 
       if (line.contains("$")) 
       { 
        String[] splitLine = line.split("\\s+"); 
        for (String entry : splitLine) 
        { 
         if (entry.contains("$")) 
         { 
          textArea.appendText("\t\t\t\t " + entry + "\n"); 
         } 
         else 
         { 
          textArea.appendText(entry + " "); 
         } 
        } 
       } 
       else if (line.contains("-")) 
       { 
        textArea.appendText("\t\t\t\t\t\t" + line.trim() + "\n"); 
        System.out.println(line); 
       } 
       else if (line.contains("Amount")) 
       { 
        String[] splitLine = line.split("\\s+"); 
        textArea.appendText(splitLine[0] + "\t\t\t" + splitLine[1] + "\t\t" + splitLine[2] + "\n"); 
       } 
       else 
       { 

        textArea.appendText(line + "\n"); 
       } 
      } 
     } 
     catch (FileNotFoundException ex) 
     { 
      System.err.println(ex); 
     } 
    } 

    public String writeSpace(int length, String string) 
    { 
     String spaces = ""; 

     for (int i = 0; i < length - string.length(); i++) 
     { 
      spaces += " "; 
     } 

     System.out.println(string.length() + spaces.length()); 
     return string + spaces; 
    } 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String[] args) 
    { 
     launch(args); 
    } 

} 

更新代码！