在JTextArea中打开，编辑和保存文本为.txt文件 [英] Opening, Editing and Saving text in JTextArea to .txt file

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本文介绍了在JTextArea中打开，编辑和保存文本为.txt文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在搞java swing，并试图用JTextArea打开一个包含现有数据的文本文件。它似乎没有保存任何更改，无论我尝试过的不同的东西。

以下代码读取文本文件罚款，但不写（显然）。

如果有人可以请告诉我如何成功地将更改保存到JTextArea，我将是非常棒的。

  package funwithswing; 
 
 
 import java.awt。*; 
 import javax.swing。*; 
 import java.io. *; 
 import java.util.Scanner; 
 import javax.swing.border.EmptyBorder; 
 import java.awt.event.ActionEvent; 
 import java.awt.event.ActionListener; 
 $ b public class AllDataGUI extends JFrame {
 $ b $ public AllDataGUI（）{
 fileRead（）; 
个面板（）; 
} 
 
 private String storeAllString =; 
私人JButton saveCloseBtn =新JButton（保存更改并关闭）; 
 private JButton closeButton = new JButton（Exit Without Saving）; 
 private JFrame frame = new JFrame（Viewing All Program Details）; 
 private JTextArea textArea = new JTextArea（storeAllString，0,70）; 
 
 
私人JButton getCloseButton（）{
 return closeButton; 
 
 
 private void fileRead（）{
 try {
 FileReader read = new FileReader（CompleteData.txt）; 
扫描仪扫描=新扫描仪（读取）; （$）b $ b while（scan.hasNextLine（））{
 String temp = scan.nextLine（）+\\\
; 
 storeAllString = storeAllString + temp; 
 
 $ b catch（异常异常）
 {
 exception.printStackTrace（）; 
 
 
 
 private void fileWrite（）{
 try {
 FileWriter write = new FileWriter（CompleteData.txt）; 
 textArea.write（write）; 
} 
 catch（Exception e）{
 e.printStackTrace（）; 
 
 
 $ b $ private void panels（）{
 JPanel panel = new JPanel（new GridLayout（1,1））; 
 panel.setBorder（new EmptyBorder（5，5，5））; 
 JPanel rightPanel = new JPanel（new GridLayout（15,0,10,10））; 
 rightPanel.setBorder（新的EmptyBorder（15，5，5，10））; 
 JTextArea textArea = new JTextArea（storeAllString，0,70）; 
 JScrollPane scrollBarForTextArea = new JScrollPane（textArea，JScrollPane.VERTICAL_SCROLLBAR_​​AS_NEEDED，JScrollPane.HORIZONTAL_SCROLLBAR_​​AS_NEEDED）; 
 panel.add（scrollBarForTextArea）; 
 frame.add（panel）; 
 frame.getContentPane（）。add（rightPanel，BorderLayout.EAST）; 
 rightPanel.add（saveCloseBtn）; 
 rightPanel.add（closeButton）; 
 closeButton.addActionListener（new ActionListener（）{
 public void actionPerformed（ActionEvent e）
 {
 frame.dispose（）; 
 
} 
}）; 
 frame.setSize（1000，700）; 
 frame.setVisible（true）; 
 frame.setLocationRelativeTo（null）; 
 
 
 $ b private void saveBtn（）{
 
 
} 
  pre> 
 
解决方案
在你的代码中有一些错误，我修改了这些。编译并运行下面的代码这将解决您的问题。
  import java.awt。*; 
 import javax.swing。*; 
 import java.io. *; 
 import java.util.Scanner; 
 import javax.swing.border.EmptyBorder; 
 import java.awt.event.ActionEvent; 
 import java.awt.event.ActionListener; 
 $ b public class AllDataGUI extends JFrame {
 $ b $ public AllDataGUI（）{
 fileRead（）; 
个面板（）; 
} 
 
 private String storeAllString =; 
私人JButton saveCloseBtn =新JButton（保存更改并关闭）; 
 private JButton closeButton = new JButton（Exit Without Saving）; 
 private JFrame frame = new JFrame（Viewing All Program Details）; 
 // private JTextArea textArea = new JTextArea（storeAllString，0,70）; 
 private JTextArea textArea = new JTextArea（）; 
 
 
私人JButton getCloseButton（）{
 return closeButton; 
 
 
 private void fileRead（）{
 try {
 FileReader read = new FileReader（CompleteData.txt）; 
扫描仪扫描=新扫描仪（读取）; （$）b $ b while（scan.hasNextLine（））{
 String temp = scan.nextLine（）+\\\
; 
 storeAllString = storeAllString + temp; 
} 
 textArea.setText（storeAllString）; 
 
 catch（异常异常）
 {
 exception.printStackTrace（）; 
 
 
 
 
 $ b private void panels（）{
 JPanel panel = new JPanel（new GridLayout（1,1）） ; 
 panel.setBorder（new EmptyBorder（5，5，5））; 
 JPanel rightPanel = new JPanel（new GridLayout（15,0,10,10））; 
 rightPanel.setBorder（新的EmptyBorder（15，5，5，10））; 
 // JTextArea textArea = new JTextArea（storeAllString，0,70）; 
 JScrollPane scrollBarForTextArea = new JScrollPane（textArea，JScrollPane.VERTICAL_SCROLLBAR_​​AS_NEEDED，JScrollPane.HORIZONTAL_SCROLLBAR_​​AS_NEEDED）; 
 panel.add（scrollBarForTextArea）; 
 frame.add（panel）; 
 frame.getContentPane（）。add（rightPanel，BorderLayout.EAST）; 
 rightPanel.add（saveCloseBtn）; 
 rightPanel.add（closeButton）; 
 closeButton.addActionListener（new ActionListener（）{
 public void actionPerformed（ActionEvent e）
 {
 frame.dispose（）; 
 
} 
}）; 
 saveCloseBtn.addActionListener（new ActionListener（）{
 
 public void actionPerformed（ActionEvent e）{
 saveBtn（）; 
 frame.dispose（）; 
 
} 
}）; 
 frame.setSize（1000，700）; 
 frame.setVisible（true）; 
 frame.setLocationRelativeTo（null）; 
 
 
 $ b $ private void saveBtn（）{
 File file = null; 
 FileWriter out = null; 
 
 
尝试{
 file = new File（CompleteData.txt）; 
 out = new FileWriter（file）; 
 out.write（textArea.getText（））; 
 out.close（）; 
} catch（FileNotFoundException e）{
 e.printStackTrace（）; 
} catch（IOException e）{
 e.printStackTrace（）; 
 
 $ b $ public static void main（String [] arg）
 {
 AllDataGUI（）; 
} 
} 
  
 
I am messing around with java swing and am trying to open a text file containing existing data with a JTextArea. It doesn't seem to be saving any changes regardless of the different things I have tried.



Below is code that reads the text file fine, but doesn't write it (obviously).



If someone could please advise me as to how I could successfully save changes to the JTextArea I would be greatful.
package funwithswing;


import java.awt.*;
import javax.swing.*;
import java.io.*;
import java.util.Scanner;
import javax.swing.border.EmptyBorder;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class AllDataGUI extends JFrame{   

    public AllDataGUI(){
        fileRead();
        panels();         
    }

    private String storeAllString="";
    private JButton saveCloseBtn = new JButton("Save Changes and Close");
    private JButton closeButton = new JButton("Exit Without Saving");
    private JFrame frame=new JFrame("Viewing All Program Details");
    private JTextArea textArea = new JTextArea(storeAllString,0,70);


    private JButton getCloseButton(){
        return closeButton;
     }     

    private void fileRead(){
        try{    
          FileReader read = new FileReader("CompleteData.txt");
          Scanner scan = new Scanner(read);
             while(scan.hasNextLine()){
              String temp=scan.nextLine()+"\n";
              storeAllString=storeAllString+temp;
             }
      }
        catch (Exception exception)
         {
         exception.printStackTrace();
         }
    }      

    private void fileWrite(){
        try{
            FileWriter write = new FileWriter ("CompleteData.txt");
            textArea.write(write);
        }
        catch (Exception e){
            e.printStackTrace();
        }         
    }

    private void panels(){        
         JPanel panel = new JPanel(new GridLayout(1,1));
         panel.setBorder(new EmptyBorder(5, 5, 5, 5));
         JPanel rightPanel = new JPanel(new GridLayout(15,0,10,10));
         rightPanel.setBorder(new EmptyBorder(15, 5, 5, 10));
         JTextArea textArea = new JTextArea(storeAllString,0,70);
          JScrollPane scrollBarForTextArea=new JScrollPane(textArea,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
          panel.add(scrollBarForTextArea); 
          frame.add(panel);
         frame.getContentPane().add(rightPanel,BorderLayout.EAST);
         rightPanel.add(saveCloseBtn);
          rightPanel.add(closeButton);
          closeButton.addActionListener(new ActionListener() {
                  public void actionPerformed(ActionEvent e)
                    {
                        frame.dispose();

                    }
        });
           frame.setSize(1000, 700);
           frame.setVisible(true);   
           frame.setLocationRelativeTo(null);

}

    private void saveBtn(){

  }
}



 解决方案 
There are some mistakes in your code, I have modified those. Compile and run the below code This will solv your problem.
import java.awt.*;
import javax.swing.*;
import java.io.*;
import java.util.Scanner;
import javax.swing.border.EmptyBorder;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class AllDataGUI extends JFrame{   

    public AllDataGUI(){
        fileRead();
        panels();         
    }

    private String storeAllString="";
    private JButton saveCloseBtn = new JButton("Save Changes and Close");
    private JButton closeButton = new JButton("Exit Without Saving");
    private JFrame frame=new JFrame("Viewing All Program Details");
   // private JTextArea textArea = new JTextArea(storeAllString,0,70);
    private JTextArea textArea = new JTextArea();


    private JButton getCloseButton(){
        return closeButton;
     }     

    private void fileRead(){
        try{    
          FileReader read = new FileReader("CompleteData.txt");
          Scanner scan = new Scanner(read);
             while(scan.hasNextLine()){
              String temp=scan.nextLine()+"\n";
              storeAllString=storeAllString+temp;
             }
             textArea.setText(storeAllString);
      }
        catch (Exception exception)
         {
         exception.printStackTrace();
         }
    }      



    private void panels(){        
         JPanel panel = new JPanel(new GridLayout(1,1));
         panel.setBorder(new EmptyBorder(5, 5, 5, 5));
         JPanel rightPanel = new JPanel(new GridLayout(15,0,10,10));
         rightPanel.setBorder(new EmptyBorder(15, 5, 5, 10));
        // JTextArea textArea = new JTextArea(storeAllString,0,70);
          JScrollPane scrollBarForTextArea=new JScrollPane(textArea,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
          panel.add(scrollBarForTextArea); 
          frame.add(panel);
         frame.getContentPane().add(rightPanel,BorderLayout.EAST);
         rightPanel.add(saveCloseBtn);
          rightPanel.add(closeButton);
          closeButton.addActionListener(new ActionListener() {
                  public void actionPerformed(ActionEvent e)
                    {
                        frame.dispose();

                    }
        });
          saveCloseBtn.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                saveBtn();
                frame.dispose();

            }
        });
           frame.setSize(1000, 700);
           frame.setVisible(true);   
           frame.setLocationRelativeTo(null);

}

    private void saveBtn(){
        File file = null;
        FileWriter out=null;


        try {
            file = new File("CompleteData.txt");
            out = new FileWriter(file);     
            out.write(textArea.getText());
            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
  }
    public static void main(String[] arg)
    {
        new AllDataGUI();
    }
}



                        
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