将文本文件加载到textarea中

Question

首先,我在java上非常基础.我正在尝试浏览.txt文件并将其内容加载到文本区域.我完成了部分,直到我从JFileChooser收到文件,现在我不知道如何做其余的.

.
.
.

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

Answer 1

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.*;

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);
    }
}