将文本文件加载到textarea中 [英] Loading a text file into a textarea

问题描述

首先，我对java非常基本。我正在尝试浏览.txt文件并将其内容加载到文本区域中。我完成了部分，直到我从JFileChooser接收文件，现在我不知道如何做剩下的。

  。 
。 
。 
 
文件selFile =新建文件（fileChooser.getSelectedfile（））; 
 ///从这里我想加载它的内容到一个textareatxtArea
  

解决方案

使用由所有Swing文本组件支持的read（...）和write（...）方法。简单的例子：

  import java.awt。*; 
 import java.awt.event。*; 
 import java.io. *; 
 import javax.swing。*; 
 import javax.swing.text。*; 
 $ b class TextAreaLoad 
 {
 public static void main（String a []）
 {
 final JTextArea edit = new JTextArea（30，60）; 
 edit.setText（one \\\
two\\\
three）; 
 edit.append（\\\
four\\\
five）; 
 
 JButton read = new JButton（Read TextAreaLoad.txt）; 
 read.addActionListener（new ActionListener（）
 {
 public void actionPerformed（ActionEvent e）
 {
 try 
 {
 FileReader reader = （）; 
 br.close（）; 
编辑.requestFocus（）; 
} 
 catch（Exception e2）{System.out.println（e2）;} 
} 
}）; 
 
 JButton write = new JButton（Write TextAreaLoad.txt）; 
 write.addActionListener（new ActionListener（）
 {
 public void actionPerformed（ActionEvent e）
 {
 try 
 {
 FileWriter writer = new FileWriter（TextAreaLoad.txt）; 
 BufferedWriter bw = new BufferedWriter（writer）; 
 edit.write（bw）; 
 bw.close（）; 
编辑。 setText（）; 
 edit.requestFocus（）; 
} 
 catch（Exception e2）{} 
} 
}）; 
 
 JFrame frame = new JFrame（TextArea Load）; 
 frame.getContentPane（）。add（new JScrollPane（edit），BorderLayout.NORTH）; 
 frame.getContentPane（）。add（read，BorderLayout.WEST）; 
 frame.getContentPane（）。add（write，BorderLayout.EAST）; 
 frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 frame.pack（）; 
 frame.setLocationRelativeTo（null）; 
 frame.setVisible（true）; 
} 
} 
  

First of all, I am very basic at java. I am trying to browse a .txt file and load the contents of it, into the text area. I am completed the part, till which I receive the file from the JFileChooser, now I dont know how to do the remaining.

.
.
.

File selFile = new File(fileChooser.getSelectedfile());
/// From here I want to load its content to a textarea "txtArea"

解决方案

Use the read(...) and write(...) methods that are suppoorted by all Swing text components. Simple example:

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;

class TextAreaLoad
{
    public static void main(String a[])
    {
        final JTextArea edit = new JTextArea(30, 60);
        edit.setText("one\ntwo\nthree");
        edit.append("\nfour\nfive");

        JButton read = new JButton("Read TextAreaLoad.txt");
        read.addActionListener( new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                try
                {
                    FileReader reader = new FileReader( "TextAreaLoad.txt" );
                    BufferedReader br = new BufferedReader(reader);
                    edit.read( br, null );
                    br.close();
                    edit.requestFocus();
                }
                catch(Exception e2) { System.out.println(e2); }
            }
        });

        JButton write = new JButton("Write TextAreaLoad.txt");
        write.addActionListener( new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                try
                {
                    FileWriter writer = new FileWriter( "TextAreaLoad.txt" );
                    BufferedWriter bw = new BufferedWriter( writer );
                    edit.write( bw );
                    bw.close();
                    edit.setText("");
                    edit.requestFocus();
                }
                catch(Exception e2) {}
            }
        });

        JFrame frame = new JFrame("TextArea Load");
        frame.getContentPane().add( new JScrollPane(edit), BorderLayout.NORTH );
        frame.getContentPane().add(read, BorderLayout.WEST);
        frame.getContentPane().add(write, BorderLayout.EAST);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }
}

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